chamilo /common/libraries/plugin/pear/MDB2.php

Language PHP Lines 4734
MD5 Hash 1ee6e7244bd4a5801ab352545f868f0f Estimated Cost $58,674 (why?)
Repository https://bitbucket.org/renaatdemuynck/chamilo View Raw File View Project SPDX
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
<?php
// vim: set et ts=4 sw=4 fdm=marker:
// +----------------------------------------------------------------------+
// | PHP versions 4 and 5                                                 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2007 Manuel Lemos, Tomas V.V.Cox,                 |
// | Stig. S. Bakken, Lukas Smith                                         |
// | All rights reserved.                                                 |
// +----------------------------------------------------------------------+
// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB  |
// | API as well as database abstraction for PHP applications.            |
// | This LICENSE is in the BSD license style.                            |
// |                                                                      |
// | Redistribution and use in source and binary forms, with or without   |
// | modification, are permitted provided that the following conditions   |
// | are met:                                                             |
// |                                                                      |
// | Redistributions of source code must retain the above copyright       |
// | notice, this list of conditions and the following disclaimer.        |
// |                                                                      |
// | Redistributions in binary form must reproduce the above copyright    |
// | notice, this list of conditions and the following disclaimer in the  |
// | documentation and/or other materials provided with the distribution. |
// |                                                                      |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken,    |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission.                                                  |
// |                                                                      |
// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    |
// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    |
// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE      |
// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,          |
// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
// |  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  |
// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT          |
// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE          |
// | POSSIBILITY OF SUCH DAMAGE.                                          |
// +----------------------------------------------------------------------+
// | Author: Lukas Smith <smith@pooteeweet.org>                           |
// +----------------------------------------------------------------------+
//
// $Id: MDB2.php 137 2009-11-09 13:24:37Z vanpouckesven $
//


/**
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */

require_once 'PEAR.php';

// {{{ Error constants


/**
 * The method mapErrorCode in each MDB2_dbtype implementation maps
 * native error codes to one of these.
 *
 * If you add an error code here, make sure you also add a textual
 * version of it in MDB2::errorMessage().
 */

define('MDB2_OK', true);
define('MDB2_ERROR', - 1);
define('MDB2_ERROR_SYNTAX', - 2);
define('MDB2_ERROR_CONSTRAINT', - 3);
define('MDB2_ERROR_NOT_FOUND', - 4);
define('MDB2_ERROR_ALREADY_EXISTS', - 5);
define('MDB2_ERROR_UNSUPPORTED', - 6);
define('MDB2_ERROR_MISMATCH', - 7);
define('MDB2_ERROR_INVALID', - 8);
define('MDB2_ERROR_NOT_CAPABLE', - 9);
define('MDB2_ERROR_TRUNCATED', - 10);
define('MDB2_ERROR_INVALID_NUMBER', - 11);
define('MDB2_ERROR_INVALID_DATE', - 12);
define('MDB2_ERROR_DIVZERO', - 13);
define('MDB2_ERROR_NODBSELECTED', - 14);
define('MDB2_ERROR_CANNOT_CREATE', - 15);
define('MDB2_ERROR_CANNOT_DELETE', - 16);
define('MDB2_ERROR_CANNOT_DROP', - 17);
define('MDB2_ERROR_NOSUCHTABLE', - 18);
define('MDB2_ERROR_NOSUCHFIELD', - 19);
define('MDB2_ERROR_NEED_MORE_DATA', - 20);
define('MDB2_ERROR_NOT_LOCKED', - 21);
define('MDB2_ERROR_VALUE_COUNT_ON_ROW', - 22);
define('MDB2_ERROR_INVALID_DSN', - 23);
define('MDB2_ERROR_CONNECT_FAILED', - 24);
define('MDB2_ERROR_EXTENSION_NOT_FOUND', - 25);
define('MDB2_ERROR_NOSUCHDB', - 26);
define('MDB2_ERROR_ACCESS_VIOLATION', - 27);
define('MDB2_ERROR_CANNOT_REPLACE', - 28);
define('MDB2_ERROR_CONSTRAINT_NOT_NULL', - 29);
define('MDB2_ERROR_DEADLOCK', - 30);
define('MDB2_ERROR_CANNOT_ALTER', - 31);
define('MDB2_ERROR_MANAGER', - 32);
define('MDB2_ERROR_MANAGER_PARSE', - 33);
define('MDB2_ERROR_LOADMODULE', - 34);
define('MDB2_ERROR_INSUFFICIENT_DATA', - 35);
define('MDB2_ERROR_NO_PERMISSION', - 36);
define('MDB2_ERROR_DISCONNECT_FAILED', - 37);

// }}}
// {{{ Verbose constants
/**
 * These are just helper constants to more verbosely express parameters to prepare()
 */

define('MDB2_PREPARE_MANIP', false);
define('MDB2_PREPARE_RESULT', null);

// }}}
// {{{ Fetchmode constants


/**
 * This is a special constant that tells MDB2 the user hasn't specified
 * any particular get mode, so the default should be used.
 */
define('MDB2_FETCHMODE_DEFAULT', 0);

/**
 * Column data indexed by numbers, ordered from 0 and up
 */
define('MDB2_FETCHMODE_ORDERED', 1);

/**
 * Column data indexed by column names
 */
define('MDB2_FETCHMODE_ASSOC', 2);

/**
 * Column data as object properties
 */
define('MDB2_FETCHMODE_OBJECT', 3);

/**
 * For multi-dimensional results: normally the first level of arrays
 * is the row number, and the second level indexed by column number or name.
 * MDB2_FETCHMODE_FLIPPED switches this order, so the first level of arrays
 * is the column name, and the second level the row number.
 */
define('MDB2_FETCHMODE_FLIPPED', 4);

// }}}
// {{{ Portability mode constants


/**
 * Portability: turn off all portability features.
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_NONE', 0);

/**
 * Portability: convert names of tables and fields to case defined in the
 * "field_case" option when using the query*(), fetch*() and tableInfo() methods.
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_FIX_CASE', 1);

/**
 * Portability: right trim the data output by query*() and fetch*().
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_RTRIM', 2);

/**
 * Portability: force reporting the number of rows deleted.
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_DELETE_COUNT', 4);

/**
 * Portability: not needed in MDB2 (just left here for compatibility to DB)
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_NUMROWS', 8);

/**
 * Portability: makes certain error messages in certain drivers compatible
 * with those from other DBMS's.
 *
 * + mysql, mysqli:  change unique/primary key constraints
 * MDB2_ERROR_ALREADY_EXISTS -> MDB2_ERROR_CONSTRAINT
 *
 * + odbc(access):  MS's ODBC driver reports 'no such field' as code
 * 07001, which means 'too few parameters.'  When this option is on
 * that code gets mapped to MDB2_ERROR_NOSUCHFIELD.
 *
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_ERRORS', 16);

/**
 * Portability: convert empty values to null strings in data output by
 * query*() and fetch*().
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_EMPTY_TO_NULL', 32);

/**
 * Portability: removes database/table qualifiers from associative indexes
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES', 64);

/**
 * Portability: turn on all portability features.
 * @see MDB2_Driver_Common::setOption()
 */
define('MDB2_PORTABILITY_ALL', 127);

// }}}
// {{{ Globals for class instance tracking


/**
 * These are global variables that are used to track the various class instances
 */

$GLOBALS['_MDB2_databases'] = array();
$GLOBALS['_MDB2_dsninfo_default'] = array('phptype' => false, 'dbsyntax' => false, 'username' => false,
        'password' => false, 'protocol' => false, 'hostspec' => false, 'port' => false, 'socket' => false,
        'database' => false, 'mode' => false);

// }}}
// {{{ class MDB2


/**
 * The main 'MDB2' class is simply a container class with some static
 * methods for creating DB objects as well as some utility functions
 * common to all parts of DB.
 *
 * The object model of MDB2 is as follows (indentation means inheritance):
 *
 * MDB2          The main MDB2 class.  This is simply a utility class
 * with some 'static' methods for creating MDB2 objects as
 * well as common utility functions for other MDB2 classes.
 *
 * MDB2_Driver_Common   The base for each MDB2 implementation.  Provides default
 * |            implementations (in OO lingo virtual methods) for
 * |            the actual DB implementations as well as a bunch of
 * |            query utility functions.
 * |
 * +-MDB2_Driver_mysql  The MDB2 implementation for MySQL. Inherits MDB2_Driver_Common.
 * When calling MDB2::factory or MDB2::connect for MySQL
 * connections, the object returned is an instance of this
 * class.
 * +-MDB2_Driver_pgsql  The MDB2 implementation for PostGreSQL. Inherits MDB2_Driver_Common.
 * When calling MDB2::factory or MDB2::connect for PostGreSQL
 * connections, the object returned is an instance of this
 * class.
 *
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */
class MDB2
{

    // {{{ function setOptions(&$db, $options)


    /**
     * set option array   in an exiting database object
     *
     * @param   MDB2_Driver_Common  MDB2 object
     * @param   array   An associative array of option names and their values.
     *
     * @return mixed   MDB2_OK or a PEAR Error object
     *
     * @access  public
     */
    function setOptions(&$db, $options)
    {
        if (is_array($options))
        {
            foreach ($options as $option => $value)
            {
                $test = $db->setOption($option, $value);
                if (PEAR :: isError($test))
                {
                    return $test;
                }
            }
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function classExists($classname)


    /**
     * Checks if a class exists without triggering __autoload
     *
     * @param   string  classname
     *
     * @return  bool    true success and false on error
     * @static
     * @access  public
     */
    function classExists($classname)
    {
        if (version_compare(phpversion(), "5.0", ">="))
        {
            return class_exists($classname, false);
        }
        return class_exists($classname);
    }

    // }}}
    // {{{ function loadClass($class_name, $debug)


    /**
     * Loads a PEAR class.
     *
     * @param   string  classname to load
     * @param   bool    if errors should be suppressed
     *
     * @return  mixed   true success or PEAR_Error on failure
     *
     * @access  public
     */
    function loadClass($class_name, $debug)
    {
        if (! MDB2 :: classExists($class_name))
        {
            $file_name = str_replace('_', DIRECTORY_SEPARATOR, $class_name) . '.php';
            if ($debug)
            {
                $include = include_once ($file_name);
            }
            else
            {
                $include = @include_once ($file_name);
            }
            if (! $include)
            {
                if (! MDB2 :: fileExists($file_name))
                {
                    $msg = "unable to find package '$class_name' file '$file_name'";
                }
                else
                {
                    $msg = "unable to load class '$class_name' from file '$file_name'";
                }
                $err = & MDB2 :: raiseError(MDB2_ERROR_NOT_FOUND, null, null, $msg);
                return $err;
            }
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function &factory($dsn, $options = false)


    /**
     * Create a new MDB2 object for the specified database type
     *
     * IMPORTANT: In order for MDB2 to work properly it is necessary that
     * you make sure that you work with a reference of the original
     * object instead of a copy (this is a PHP4 quirk).
     *
     * For example:
     * $db =& MDB2::factory($dsn);
     * ^^
     * And not:
     * $db = MDB2::factory($dsn);
     *
     * @param   mixed   'data source name', see the MDB2::parseDSN
     * method for a description of the dsn format.
     * Can also be specified as an array of the
     * format returned by MDB2::parseDSN.
     * @param   array   An associative array of option names and
     * their values.
     *
     * @return  mixed   a newly created MDB2 object, or false on error
     *
     * @access  public
     */
    function &factory($dsn, $options = false)
    {
        $dsninfo = MDB2 :: parseDSN($dsn);
        if (empty($dsninfo['phptype']))
        {
            $err = & MDB2 :: raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'no RDBMS driver specified');
            return $err;
        }
        $class_name = 'MDB2_Driver_' . $dsninfo['phptype'];

        $debug = (! empty($options['debug']));
        $err = MDB2 :: loadClass($class_name, $debug);
        if (PEAR :: isError($err))
        {
            return $err;
        }

        $db = new $class_name();
        $db->setDSN($dsninfo);
        $err = MDB2 :: setOptions($db, $options);
        if (PEAR :: isError($err))
        {
            return $err;
        }

        return $db;
    }

    // }}}
    // {{{ function &connect($dsn, $options = false)


    /**
     * Create a new MDB2_Driver_* connection object and connect to the specified
     * database
     *
     * IMPORTANT: In order for MDB2 to work properly it is necessary that
     * you make sure that you work with a reference of the original
     * object instead of a copy (this is a PHP4 quirk).
     *
     * For example:
     * $db =& MDB2::connect($dsn);
     * ^^
     * And not:
     * $db = MDB2::connect($dsn);
     * ^^
     *
     * @param mixed $dsn     'data source name', see the MDB2::parseDSN
     * method for a description of the dsn format.
     * Can also be specified as an array of the
     * format returned by MDB2::parseDSN.
     * @param array $options An associative array of option names and
     * their values.
     *
     * @return mixed a newly created MDB2 connection object, or a MDB2
     * error object on error
     *
     * @access  public
     * @see     MDB2::parseDSN
     */
    function &connect($dsn, $options = false)
    {
        $db = & MDB2 :: factory($dsn, $options);
        if (PEAR :: isError($db))
        {
            return $db;
        }

        $err = $db->connect();
        if (PEAR :: isError($err))
        {
            $dsn = $db->getDSN('string', 'xxx');
            $db->disconnect();
            $err->addUserInfo($dsn);
            return $err;
        }

        return $db;
    }

    // }}}
    // {{{ function &singleton($dsn = null, $options = false)


    /**
     * Returns a MDB2 connection with the requested DSN.
     * A new MDB2 connection object is only created if no object with the
     * requested DSN exists yet.
     *
     * IMPORTANT: In order for MDB2 to work properly it is necessary that
     * you make sure that you work with a reference of the original
     * object instead of a copy (this is a PHP4 quirk).
     *
     * For example:
     * $db =& MDB2::singleton($dsn);
     * ^^
     * And not:
     * $db = MDB2::singleton($dsn);
     * ^^
     *
     * @param   mixed   'data source name', see the MDB2::parseDSN
     * method for a description of the dsn format.
     * Can also be specified as an array of the
     * format returned by MDB2::parseDSN.
     * @param   array   An associative array of option names and
     * their values.
     *
     * @return  mixed   a newly created MDB2 connection object, or a MDB2
     * error object on error
     *
     * @access  public
     * @see     MDB2::parseDSN
     */
    function &singleton($dsn = null, $options = false)
    {
        if ($dsn)
        {
            $dsninfo = MDB2 :: parseDSN($dsn);
            $dsninfo = array_merge($GLOBALS['_MDB2_dsninfo_default'], $dsninfo);
            $keys = array_keys($GLOBALS['_MDB2_databases']);
            for($i = 0, $j = count($keys); $i < $j; ++ $i)
            {
                if (isset($GLOBALS['_MDB2_databases'][$keys[$i]]))
                {
                    $tmp_dsn = $GLOBALS['_MDB2_databases'][$keys[$i]]->getDSN('array');
                    if (count(array_diff_assoc($tmp_dsn, $dsninfo)) == 0)
                    {
                        MDB2 :: setOptions($GLOBALS['_MDB2_databases'][$keys[$i]], $options);
                        return $GLOBALS['_MDB2_databases'][$keys[$i]];
                    }
                }
            }
        }
        elseif (is_array($GLOBALS['_MDB2_databases']) && reset($GLOBALS['_MDB2_databases']))
        {
            $db = & $GLOBALS['_MDB2_databases'][key($GLOBALS['_MDB2_databases'])];
            return $db;
        }
        $db = & MDB2 :: factory($dsn, $options);
        return $db;
    }

    // }}}
    // {{{ function areEquals()


    /**
     * It looks like there's a memory leak in array_diff() in PHP 5.1.x,
     * so use this method instead.
     * @see http://pear.php.net/bugs/bug.php?id=11790
     *
     * @param array $arr1
     * @param array $arr2
     * @return boolean
     */
    function areEquals($arr1, $arr2)
    {
        if (count($arr1) != count($arr2))
        {
            return false;
        }
        foreach (array_keys($arr1) as $k)
        {
            if (! array_key_exists($k, $arr2) || $arr1[$k] != $arr2[$k])
            {
                return false;
            }
        }
        return true;
    }

    // }}}
    // {{{ function loadFile($file)


    /**
     * load a file (like 'Date')
     *
     * @param   string  name of the file in the MDB2 directory (without '.php')
     *
     * @return  string  name of the file that was included
     *
     * @access  public
     */
    function loadFile($file)
    {
        $file_name = 'MDB2' . DIRECTORY_SEPARATOR . $file . '.php';
        if (! MDB2 :: fileExists($file_name))
        {
            return MDB2 :: raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'unable to find: ' . $file_name);
        }
        if (! include_once ($file_name))
        {
            return MDB2 :: raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'unable to load driver class: ' . $file_name);
        }
        return $file_name;
    }

    // }}}
    // {{{ function apiVersion()


    /**
     * Return the MDB2 API version
     *
     * @return  string  the MDB2 API version number
     *
     * @access  public
     */
    function apiVersion()
    {
        return '2.5.0b2';
    }

    // }}}
    // {{{ function &raiseError($code = null, $mode = null, $options = null, $userinfo = null)


    /**
     * This method is used to communicate an error and invoke error
     * callbacks etc.  Basically a wrapper for PEAR::raiseError
     * without the message string.
     *
     * @param   mixed  int error code
     *
     * @param   int    error mode, see PEAR_Error docs
     *
     * @param   mixed  If error mode is PEAR_ERROR_TRIGGER, this is the
     * error level (E_USER_NOTICE etc).  If error mode is
     * PEAR_ERROR_CALLBACK, this is the callback function,
     * either as a function name, or as an array of an
     * object and method name.  For other error modes this
     * parameter is ignored.
     *
     * @param   string Extra debug information.  Defaults to the last
     * query and native error code.
     *
     * @return PEAR_Error instance of a PEAR Error object
     *
     * @access  private
     * @see     PEAR_Error
     */
    function &raiseError($code = null, $mode = null, $options = null, $userinfo = null, $dummy1 = null, $dummy2 = null, $dummy3 = false)
    {
        $err = & PEAR :: raiseError(null, $code, $mode, $options, $userinfo, 'MDB2_Error', true);
        return $err;
    }

    // }}}
    // {{{ function isError($data, $code = null)


    /**
     * Tell whether a value is a MDB2 error.
     *
     * @param   mixed   the value to test
     * @param   int     if is an error object, return true
     * only if $code is a string and
     * $db->getMessage() == $code or
     * $code is an integer and $db->getCode() == $code
     *
     * @return  bool    true if parameter is an error
     *
     * @access  public
     */
    function isError($data, $code = null)
    {
        if (is_a($data, 'MDB2_Error'))
        {
            if (is_null($code))
            {
                return true;
            }
            elseif (is_string($code))
            {
                return $data->getMessage() === $code;
            }
            else
            {
                $code = (array) $code;
                return in_array($data->getCode(), $code);
            }
        }
        return false;
    }

    // }}}
    // {{{ function isConnection($value)


    /**
     * Tell whether a value is a MDB2 connection
     *
     * @param   mixed   value to test
     *
     * @return  bool    whether $value is a MDB2 connection
     *
     * @access  public
     */
    function isConnection($value)
    {
        return is_a($value, 'MDB2_Driver_Common');
    }

    // }}}
    // {{{ function isResult($value)


    /**
     * Tell whether a value is a MDB2 result
     *
     * @param   mixed   value to test
     *
     * @return  bool    whether $value is a MDB2 result
     *
     * @access  public
     */
    function isResult($value)
    {
        return is_a($value, 'MDB2_Result');
    }

    // }}}
    // {{{ function isResultCommon($value)


    /**
     * Tell whether a value is a MDB2 result implementing the common interface
     *
     * @param   mixed   value to test
     *
     * @return  bool    whether $value is a MDB2 result implementing the common interface
     *
     * @access  public
     */
    function isResultCommon($value)
    {
        return is_a($value, 'MDB2_Result_Common');
    }

    // }}}
    // {{{ function isStatement($value)


    /**
     * Tell whether a value is a MDB2 statement interface
     *
     * @param   mixed   value to test
     *
     * @return  bool    whether $value is a MDB2 statement interface
     *
     * @access  public
     */
    function isStatement($value)
    {
        return is_a($value, 'MDB2_Statement_Common');
    }

    // }}}
    // {{{ function errorMessage($value = null)


    /**
     * Return a textual error message for a MDB2 error code
     *
     * @param   int|array   integer error code,
                                null to get the current error code-message map,
                                or an array with a new error code-message map
     *
     * @return  string  error message, or false if the error code was
     * not recognized
     *
     * @access  public
     */
    function errorMessage($value = null)
    {
        static $errorMessages;

        if (is_array($value))
        {
            $errorMessages = $value;
            return MDB2_OK;
        }

        if (! isset($errorMessages))
        {
            $errorMessages = array(MDB2_OK => 'no error', MDB2_ERROR => 'unknown error',
                    MDB2_ERROR_ALREADY_EXISTS => 'already exists', MDB2_ERROR_CANNOT_CREATE => 'can not create',
                    MDB2_ERROR_CANNOT_ALTER => 'can not alter', MDB2_ERROR_CANNOT_REPLACE => 'can not replace',
                    MDB2_ERROR_CANNOT_DELETE => 'can not delete', MDB2_ERROR_CANNOT_DROP => 'can not drop',
                    MDB2_ERROR_CONSTRAINT => 'constraint violation',
                    MDB2_ERROR_CONSTRAINT_NOT_NULL => 'null value violates not-null constraint',
                    MDB2_ERROR_DIVZERO => 'division by zero', MDB2_ERROR_INVALID => 'invalid',
                    MDB2_ERROR_INVALID_DATE => 'invalid date or time', MDB2_ERROR_INVALID_NUMBER => 'invalid number',
                    MDB2_ERROR_MISMATCH => 'mismatch', MDB2_ERROR_NODBSELECTED => 'no database selected',
                    MDB2_ERROR_NOSUCHFIELD => 'no such field', MDB2_ERROR_NOSUCHTABLE => 'no such table',
                    MDB2_ERROR_NOT_CAPABLE => 'MDB2 backend not capable', MDB2_ERROR_NOT_FOUND => 'not found',
                    MDB2_ERROR_NOT_LOCKED => 'not locked', MDB2_ERROR_SYNTAX => 'syntax error',
                    MDB2_ERROR_UNSUPPORTED => 'not supported', MDB2_ERROR_VALUE_COUNT_ON_ROW => 'value count on row',
                    MDB2_ERROR_INVALID_DSN => 'invalid DSN', MDB2_ERROR_CONNECT_FAILED => 'connect failed',
                    MDB2_ERROR_NEED_MORE_DATA => 'insufficient data supplied',
                    MDB2_ERROR_EXTENSION_NOT_FOUND => 'extension not found',
                    MDB2_ERROR_NOSUCHDB => 'no such database',
                    MDB2_ERROR_ACCESS_VIOLATION => 'insufficient permissions',
                    MDB2_ERROR_LOADMODULE => 'error while including on demand module',
                    MDB2_ERROR_TRUNCATED => 'truncated', MDB2_ERROR_DEADLOCK => 'deadlock detected',
                    MDB2_ERROR_NO_PERMISSION => 'no permission', MDB2_ERROR_DISCONNECT_FAILED => 'disconnect failed');
        }

        if (is_null($value))
        {
            return $errorMessages;
        }

        if (PEAR :: isError($value))
        {
            $value = $value->getCode();
        }

        return isset($errorMessages[$value]) ? $errorMessages[$value] : $errorMessages[MDB2_ERROR];
    }

    // }}}
    // {{{ function parseDSN($dsn)


    /**
     * Parse a data source name.
     *
     * Additional keys can be added by appending a URI query string to the
     * end of the DSN.
     *
     * The format of the supplied DSN is in its fullest form:
     * <code>
     * phptype(dbsyntax)://username:password@protocol+hostspec/database?option=8&another=true
     * </code>
     *
     * Most variations are allowed:
     * <code>
     * phptype://username:password@protocol+hostspec:110//usr/db_file.db?mode=0644
     * phptype://username:password@hostspec/database_name
     * phptype://username:password@hostspec
     * phptype://username@hostspec
     * phptype://hostspec/database
     * phptype://hostspec
     * phptype(dbsyntax)
     * phptype
     * </code>
     *
     * @param   string  Data Source Name to be parsed
     *
     * @return  array   an associative array with the following keys:
     * + phptype:  Database backend used in PHP (mysql, odbc etc.)
     * + dbsyntax: Database used with regards to SQL syntax etc.
     * + protocol: Communication protocol to use (tcp, unix etc.)
     * + hostspec: Host specification (hostname[:port])
     * + database: Database to use on the DBMS server
     * + username: User name for login
     * + password: Password for login
     *
     * @access  public
     * @author  Tomas V.V.Cox <cox@idecnet.com>
     */
    function parseDSN($dsn)
    {
        $parsed = $GLOBALS['_MDB2_dsninfo_default'];

        if (is_array($dsn))
        {
            $dsn = array_merge($parsed, $dsn);
            if (! $dsn['dbsyntax'])
            {
                $dsn['dbsyntax'] = $dsn['phptype'];
            }
            return $dsn;
        }

        // Find phptype and dbsyntax
        if (($pos = strpos($dsn, '://')) !== false)
        {
            $str = substr($dsn, 0, $pos);
            $dsn = substr($dsn, $pos + 3);
        }
        else
        {
            $str = $dsn;
            $dsn = null;
        }

        // Get phptype and dbsyntax
        // $str => phptype(dbsyntax)
        if (preg_match('|^(.+?)\((.*?)\)$|', $str, $arr))
        {
            $parsed['phptype'] = $arr[1];
            $parsed['dbsyntax'] = ! $arr[2] ? $arr[1] : $arr[2];
        }
        else
        {
            $parsed['phptype'] = $str;
            $parsed['dbsyntax'] = $str;
        }

        if (! count($dsn))
        {
            return $parsed;
        }

        // Get (if found): username and password
        // $dsn => username:password@protocol+hostspec/database
        if (($at = strrpos($dsn, '@')) !== false)
        {
            $str = substr($dsn, 0, $at);
            $dsn = substr($dsn, $at + 1);
            if (($pos = strpos($str, ':')) !== false)
            {
                $parsed['username'] = rawurldecode(substr($str, 0, $pos));
                $parsed['password'] = rawurldecode(substr($str, $pos + 1));
            }
            else
            {
                $parsed['username'] = rawurldecode($str);
            }
        }

        // Find protocol and hostspec


        // $dsn => proto(proto_opts)/database
        if (preg_match('|^([^(]+)\((.*?)\)/?(.*?)$|', $dsn, $match))
        {
            $proto = $match[1];
            $proto_opts = $match[2] ? $match[2] : false;
            $dsn = $match[3];

     // $dsn => protocol+hostspec/database (old format)
        }
        else
        {
            if (strpos($dsn, '+') !== false)
            {
                list($proto, $dsn) = explode('+', $dsn, 2);
            }
            if (strpos($dsn, '//') === 0 && strpos($dsn, '/', 2) !== false && $parsed['phptype'] == 'oci8')
            {
                //oracle's "Easy Connect" syntax:
                //"username/password@[//]host[:port][/service_name]"
                //e.g. "scott/tiger@//mymachine:1521/oracle"
                $proto_opts = $dsn;
                $dsn = substr($proto_opts, strrpos($proto_opts, '/') + 1);
            }
            elseif (strpos($dsn, '/') !== false)
            {
                list($proto_opts, $dsn) = explode('/', $dsn, 2);
            }
            else
            {
                $proto_opts = $dsn;
                $dsn = null;
            }
        }

        // process the different protocol options
        $parsed['protocol'] = (! empty($proto)) ? $proto : 'tcp';
        $proto_opts = rawurldecode($proto_opts);
        if (strpos($proto_opts, ':') !== false)
        {
            list($proto_opts, $parsed['port']) = explode(':', $proto_opts);
        }
        if ($parsed['protocol'] == 'tcp')
        {
            $parsed['hostspec'] = $proto_opts;
        }
        elseif ($parsed['protocol'] == 'unix')
        {
            $parsed['socket'] = $proto_opts;
        }

        // Get dabase if any
        // $dsn => database
        if ($dsn)
        {
            // /database
            if (($pos = strpos($dsn, '?')) === false)
            {
                $parsed['database'] = $dsn;

     // /database?param1=value1&param2=value2
            }
            else
            {
                $parsed['database'] = substr($dsn, 0, $pos);
                $dsn = substr($dsn, $pos + 1);
                if (strpos($dsn, '&') !== false)
                {
                    $opts = explode('&', $dsn);
                }
                else
                { // database?param1=value1
                    $opts = array($dsn);
                }
                foreach ($opts as $opt)
                {
                    list($key, $value) = explode('=', $opt);
                    if (! isset($parsed[$key]))
                    {
                        // don't allow params overwrite
                        $parsed[$key] = rawurldecode($value);
                    }
                }
            }
        }

        return $parsed;
    }

    // }}}
    // {{{ function fileExists($file)


    /**
     * Checks if a file exists in the include path
     *
     * @param   string  filename
     *
     * @return  bool    true success and false on error
     *
     * @access  public
     */
    function fileExists($file)
    {
        // safe_mode does notwork with is_readable()
        if (! @ini_get('safe_mode'))
        {
            $dirs = explode(PATH_SEPARATOR, ini_get('include_path'));
            foreach ($dirs as $dir)
            {
                if (is_readable($dir . DIRECTORY_SEPARATOR . $file))
                {
                    return true;
                }
            }
        }
        else
        {
            $fp = @fopen($file, 'r', true);
            if (is_resource($fp))
            {
                @fclose($fp);
                return true;
            }
        }
        return false;
    }

    // }}}
}

// }}}
// {{{ class MDB2_Error extends PEAR_Error


/**
 * MDB2_Error implements a class for reporting portable database error
 * messages.
 *
 * @package     MDB2
 * @category    Database
 * @author Stig Bakken <ssb@fast.no>
 */
class MDB2_Error extends PEAR_Error
{

    // {{{ constructor: function __construct($code = MDB2_ERROR, $mode = PEAR_ERROR_RETURN, $level = E_USER_NOTICE, $debuginfo = null)


    /**
     * MDB2_Error constructor.
     *
     * @param   mixed   MDB2 error code, or string with error message.
     * @param   int     what 'error mode' to operate in
     * @param   int     what error level to use for $mode & PEAR_ERROR_TRIGGER
     * @param   mixed   additional debug info, such as the last query
     */
    function __construct($code = MDB2_ERROR, $mode = PEAR_ERROR_RETURN, $level = E_USER_NOTICE, $debuginfo = null, $dummy = null)
    {
        if (is_null($code))
        {
            $code = MDB2_ERROR;
        }
        parent :: __construct('MDB2 Error: ' . MDB2 :: errorMessage($code), $code, $mode, $level, $debuginfo);
    }

    // }}}
}

// }}}
// {{{ class MDB2_Driver_Common extends PEAR


/**
 * MDB2_Driver_Common: Base class that is extended by each MDB2 driver
 *
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Driver_Common extends PEAR
{
    // {{{ Variables (Properties)


    /**
     * index of the MDB2 object within the $GLOBALS['_MDB2_databases'] array
     * @var     int
     * @access  public
     */
    var $db_index = 0;

    /**
     * DSN used for the next query
     * @var     array
     * @access  protected
     */
    var $dsn = array();

    /**
     * DSN that was used to create the current connection
     * @var     array
     * @access  protected
     */
    var $connected_dsn = array();

    /**
     * connection resource
     * @var     mixed
     * @access  protected
     */
    var $connection = 0;

    /**
     * if the current opened connection is a persistent connection
     * @var     bool
     * @access  protected
     */
    var $opened_persistent;

    /**
     * the name of the database for the next query
     * @var     string
     * @access  protected
     */
    var $database_name = '';

    /**
     * the name of the database currently selected
     * @var     string
     * @access  protected
     */
    var $connected_database_name = '';

    /**
     * server version information
     * @var     string
     * @access  protected
     */
    var $connected_server_info = '';

    /**
     * list of all supported features of the given driver
     * @var     array
     * @access  public
     */
    var $supported = array('sequences' => false, 'indexes' => false, 'affected_rows' => false,
            'summary_functions' => false, 'order_by_text' => false, 'transactions' => false, 'savepoints' => false,
            'current_id' => false, 'limit_queries' => false, 'LOBs' => false, 'replace' => false, 'sub_selects' => false,
            'triggers' => false, 'auto_increment' => false, 'primary_key' => false, 'result_introspection' => false,
            'prepared_statements' => false, 'identifier_quoting' => false, 'pattern_escaping' => false,
            'new_link' => false);

    /**
     * Array of supported options that can be passed to the MDB2 instance.
     *
     * The options can be set during object creation, using
     * MDB2::connect(), MDB2::factory() or MDB2::singleton(). The options can
     * also be set after the object is created, using MDB2::setOptions() or
     * MDB2_Driver_Common::setOption().
     * The list of available option includes:
     * <ul>
     * <li>$options['ssl'] -> boolean: determines if ssl should be used for connections</li>
     * <li>$options['field_case'] -> CASE_LOWER|CASE_UPPER: determines what case to force on field/table names</li>
     * <li>$options['disable_query'] -> boolean: determines if queries should be executed</li>
     * <li>$options['result_class'] -> string: class used for result sets</li>
     * <li>$options['buffered_result_class'] -> string: class used for buffered result sets</li>
     * <li>$options['result_wrap_class'] -> string: class used to wrap result sets into</li>
     * <li>$options['result_buffering'] -> boolean should results be buffered or not?</li>
     * <li>$options['fetch_class'] -> string: class to use when fetch mode object is used</li>
     * <li>$options['persistent'] -> boolean: persistent connection?</li>
     * <li>$options['debug'] -> integer: numeric debug level</li>
     * <li>$options['debug_handler'] -> string: function/method that captures debug messages</li>
     * <li>$options['debug_expanded_output'] -> bool: BC option to determine if more context information should be send to the debug handler</li>
     * <li>$options['default_text_field_length'] -> integer: default text field length to use</li>
     * <li>$options['lob_buffer_length'] -> integer: LOB buffer length</li>
     * <li>$options['log_line_break'] -> string: line-break format</li>
     * <li>$options['idxname_format'] -> string: pattern for index name</li>
     * <li>$options['seqname_format'] -> string: pattern for sequence name</li>
     * <li>$options['savepoint_format'] -> string: pattern for auto generated savepoint names</li>
     * <li>$options['statement_format'] -> string: pattern for prepared statement names</li>
     * <li>$options['seqcol_name'] -> string: sequence column name</li>
     * <li>$options['quote_identifier'] -> boolean: if identifier quoting should be done when check_option is used</li>
     * <li>$options['use_transactions'] -> boolean: if transaction use should be enabled</li>
     * <li>$options['decimal_places'] -> integer: number of decimal places to handle</li>
     * <li>$options['portability'] -> integer: portability constant</li>
     * <li>$options['modules'] -> array: short to long module name mapping for __call()</li>
     * <li>$options['emulate_prepared'] -> boolean: force prepared statements to be emulated</li>
     * <li>$options['datatype_map'] -> array: map user defined datatypes to other primitive datatypes</li>
     * <li>$options['datatype_map_callback'] -> array: callback function/method that should be called</li>
     * <li>$options['bindname_format'] -> string: regular expression pattern for named parameters</li>
     * <li>$options['multi_query'] -> boolean: determines if queries returning multiple result sets should be executed</li>
     * <li>$options['max_identifiers_length'] -> integer: max identifier length</li>
     * <li>$options['default_fk_action_onupdate'] -> string: default FOREIGN KEY ON UPDATE action ['RESTRICT'|'NO ACTION'|'SET DEFAULT'|'SET NULL'|'CASCADE']</li>
     * <li>$options['default_fk_action_ondelete'] -> string: default FOREIGN KEY ON DELETE action ['RESTRICT'|'NO ACTION'|'SET DEFAULT'|'SET NULL'|'CASCADE']</li>
     * </ul>
     *
     * @var     array
     * @access  public
     * @see     MDB2::connect()
     * @see     MDB2::factory()
     * @see     MDB2::singleton()
     * @see     MDB2_Driver_Common::setOption()
     */
    var $options = array('ssl' => false, 'field_case' => CASE_LOWER, 'disable_query' => false,
            'result_class' => 'MDB2_Result_%s', 'buffered_result_class' => 'MDB2_BufferedResult_%s',
            'result_wrap_class' => false, 'result_buffering' => true, 'fetch_class' => 'stdClass', 'persistent' => false,
            'debug' => 0, 'debug_handler' => 'MDB2_defaultDebugOutput', 'debug_expanded_output' => false,
            'default_text_field_length' => 4096, 'lob_buffer_length' => 8192, 'log_line_break' => "\n",
            'idxname_format' => '%s_idx', 'seqname_format' => '%s_seq', 'savepoint_format' => 'MDB2_SAVEPOINT_%s',
            'statement_format' => 'MDB2_STATEMENT_%1$s_%2$s', 'seqcol_name' => 'sequence', 'quote_identifier' => false,
            'use_transactions' => true, 'decimal_places' => 2, 'portability' => MDB2_PORTABILITY_ALL,
            'modules' => array('ex' => 'Extended', 'dt' => 'Datatype', 'mg' => 'Manager', 'rv' => 'Reverse',
                    'na' => 'Native', 'fc' => 'Function'), 'emulate_prepared' => false, 'datatype_map' => array(),
            'datatype_map_callback' => array(), 'nativetype_map_callback' => array(), 'lob_allow_url_include' => false,
            'bindname_format' => '(?:\d+)|(?:[a-zA-Z][a-zA-Z0-9_]*)', 'max_identifiers_length' => 30,
            'default_fk_action_onupdate' => 'RESTRICT', 'default_fk_action_ondelete' => 'RESTRICT');

    /**
     * string array
     * @var     string
     * @access  protected
     */
    var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => false, 'escape_pattern' => false);

    /**
     * identifier quoting
     * @var     array
     * @access  protected
     */
    var $identifier_quoting = array('start' => '"', 'end' => '"', 'escape' => '"');

    /**
     * sql comments
     * @var     array
     * @access  protected
     */
    var $sql_comments = array(array('start' => '--', 'end' => "\n", 'escape' => false),
            array('start' => '/*', 'end' => '*/', 'escape' => false));

    /**
     * comparision wildcards
     * @var     array
     * @access  protected
     */
    var $wildcards = array('%', '_');

    /**
     * column alias keyword
     * @var     string
     * @access  protected
     */
    var $as_keyword = ' AS ';

    /**
     * warnings
     * @var     array
     * @access  protected
     */
    var $warnings = array();

    /**
     * string with the debugging information
     * @var     string
     * @access  public
     */
    var $debug_output = '';

    /**
     * determine if there is an open transaction
     * @var     bool
     * @access  protected
     */
    var $in_transaction = false;

    /**
     * the smart transaction nesting depth
     * @var     int
     * @access  protected
     */
    var $nested_transaction_counter = null;

    /**
     * the first error that occured inside a nested transaction
     * @var     MDB2_Error|bool
     * @access  protected
     */
    var $has_transaction_error = false;

    /**
     * result offset used in the next query
     * @var     int
     * @access  protected
     */
    var $offset = 0;

    /**
     * result limit used in the next query
     * @var     int
     * @access  protected
     */
    var $limit = 0;

    /**
     * Database backend used in PHP (mysql, odbc etc.)
     * @var     string
     * @access  public
     */
    var $phptype;

    /**
     * Database used with regards to SQL syntax etc.
     * @var     string
     * @access  public
     */
    var $dbsyntax;

    /**
     * the last query sent to the driver
     * @var     string
     * @access  public
     */
    var $last_query;

    /**
     * the default fetchmode used
     * @var     int
     * @access  protected
     */
    var $fetchmode = MDB2_FETCHMODE_ORDERED;

    /**
     * array of module instances
     * @var     array
     * @access  protected
     */
    var $modules = array();

    /**
     * determines of the PHP4 destructor emulation has been enabled yet
     * @var     array
     * @access  protected
     */
    var $destructor_registered = true;

    // }}}
    // {{{ constructor: function __construct()


    /**
     * Constructor
     */
    function __construct()
    {
        end($GLOBALS['_MDB2_databases']);
        $db_index = key($GLOBALS['_MDB2_databases']) + 1;
        $GLOBALS['_MDB2_databases'][$db_index] = &$this;
        $this->db_index = $db_index;
    }

    // }}}
    // {{{ function __construct()


    /**
     * PHP 4 Constructor
     */
    //    function __construct()
    //    {
    //        $this->destructor_registered = false;
    //        $this->__construct();
    //    }


    // }}}
    // {{{ destructor: function __destruct()


    /**
     * Destructor
     */
    function __destruct()
    {
        $this->disconnect(false);
    }

    // }}}
    // {{{ function free()


    /**
     * Free the internal references so that the instance can be destroyed
     *
     * @return  bool    true on success, false if result is invalid
     *
     * @access  public
     */
    function free()
    {
        unset($GLOBALS['_MDB2_databases'][$this->db_index]);
        unset($this->db_index);
        return MDB2_OK;
    }

    // }}}
    // {{{ function __toString()


    /**
     * String conversation
     *
     * @return  string representation of the object
     *
     * @access  public
     */
    function __toString()
    {
        $info = get_class($this);
        $info .= ': (phptype = ' . $this->phptype . ', dbsyntax = ' . $this->dbsyntax . ')';
        if ($this->connection)
        {
            $info .= ' [connected]';
        }
        return $info;
    }

    // }}}
    // {{{ function errorInfo($error = null)


    /**
     * This method is used to collect information about an error
     *
     * @param   mixed   error code or resource
     *
     * @return  array   with MDB2 errorcode, native error code, native message
     *
     * @access  public
     */
    function errorInfo($error = null)
    {
        return array($error, null, null);
    }

    // }}}
    // {{{ function &raiseError($code = null, $mode = null, $options = null, $userinfo = null)


    /**
     * This method is used to communicate an error and invoke error
     * callbacks etc.  Basically a wrapper for PEAR::raiseError
     * without the message string.
     *
     * @param mixed  $code     integer error code, or a PEAR error object (all
     * other parameters are ignored if this parameter is
     * an object
     * @param int    $mode     error mode, see PEAR_Error docs
     * @param mixed  $options  If error mode is PEAR_ERROR_TRIGGER, this is the
     * error level (E_USER_NOTICE etc). If error mode is
     * PEAR_ERROR_CALLBACK, this is the callback function,
     * either as a function name, or as an array of an
     * object and method name. For other error modes this
     * parameter is ignored.
     * @param string $userinfo Extra debug information. Defaults to the last
     * query and native error code.
     * @param string $method   name of the method that triggered the error
     * @param string $dummy1   not used
     * @param bool   $dummy2   not used
     *
     * @return PEAR_Error instance of a PEAR Error object
     * @access public
     * @see    PEAR_Error
     */
    function &raiseError($code = null, $mode = null, $options = null, $userinfo = null, $method = null, $dummy1 = null, $dummy2 = false)
    {
        $userinfo = "[Error message: $userinfo]\n";
        // The error is yet a MDB2 error object
        if (PEAR :: isError($code))
        {
            // because we use the static PEAR::raiseError, our global
            // handler should be used if it is set
            if (is_null($mode) && ! empty($this->_default_error_mode))
            {
                $mode = $this->_default_error_mode;
                $options = $this->_default_error_options;
            }
            if (is_null($userinfo))
            {
                $userinfo = $code->getUserinfo();
            }
            $code = $code->getCode();
        }
        elseif ($code == MDB2_ERROR_NOT_FOUND)
        {
            // extension not loaded: don't call $this->errorInfo() or the script
        // will die
        }
        elseif (isset($this->connection))
        {
            if (! empty($this->last_query))
            {
                $userinfo .= "[Last executed query: {$this->last_query}]\n";
            }
            $native_errno = $native_msg = null;
            list($code, $native_errno, $native_msg) = $this->errorInfo($code);
            if (! is_null($native_errno) && $native_errno !== '')
            {
                $userinfo .= "[Native code: $native_errno]\n";
            }
            if (! is_null($native_msg) && $native_msg !== '')
            {
                $userinfo .= "[Native message: " . strip_tags($native_msg) . "]\n";
            }
            if (! is_null($method))
            {
                $userinfo = $method . ': ' . $userinfo;
            }
        }

        $err = & PEAR :: raiseError(null, $code, $mode, $options, $userinfo, 'MDB2_Error', true);
        if ($err->getMode() !== PEAR_ERROR_RETURN && isset($this->nested_transaction_counter) && ! $this->has_transaction_error)
        {
            $this->has_transaction_error = & $err;
        }
        return $err;
    }

    // }}}
    // {{{ function resetWarnings()


    /**
     * reset the warning array
     *
     * @return void
     *
     * @access  public
     */
    function resetWarnings()
    {
        $this->warnings = array();
    }

    // }}}
    // {{{ function getWarnings()


    /**
     * Get all warnings in reverse order.
     * This means that the last warning is the first element in the array
     *
     * @return  array   with warnings
     *
     * @access  public
     * @see     resetWarnings()
     */
    function getWarnings()
    {
        return array_reverse($this->warnings);
    }

    // }}}
    // {{{ function setFetchMode($fetchmode, $object_class = 'stdClass')


    /**
     * Sets which fetch mode should be used by default on queries
     * on this connection
     *
     * @param   int     MDB2_FETCHMODE_ORDERED, MDB2_FETCHMODE_ASSOC
     * or MDB2_FETCHMODE_OBJECT
     * @param   string  the class name of the object to be returned
     * by the fetch methods when the
     * MDB2_FETCHMODE_OBJECT mode is selected.
     * If no class is specified by default a cast
     * to object from the assoc array row will be
     * done.  There is also the possibility to use
     * and extend the 'MDB2_row' class.
     *
     * @return  mixed   MDB2_OK or MDB2 Error Object
     *
     * @access  public
     * @see     MDB2_FETCHMODE_ORDERED, MDB2_FETCHMODE_ASSOC, MDB2_FETCHMODE_OBJECT
     */
    function setFetchMode($fetchmode, $object_class = 'stdClass')
    {
        switch ($fetchmode)
        {
            case MDB2_FETCHMODE_OBJECT :
                $this->options['fetch_class'] = $object_class;
            case MDB2_FETCHMODE_ORDERED :
            case MDB2_FETCHMODE_ASSOC :
                $this->fetchmode = $fetchmode;
                break;
            default :
                return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'invalid fetchmode mode', __FUNCTION__);
        }

        return MDB2_OK;
    }

    // }}}
    // {{{ function setOption($option, $value)


    /**
     * set the option for the db class
     *
     * @param   string  option name
     * @param   mixed   value for the option
     *
     * @return  mixed   MDB2_OK or MDB2 Error Object
     *
     * @access  public
     */
    function setOption($option, $value)
    {
        if (array_key_exists($option, $this->options))
        {
            $this->options[$option] = $value;
            return MDB2_OK;
        }
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, "unknown option $option", __FUNCTION__);
    }

    // }}}
    // {{{ function getOption($option)


    /**
     * Returns the value of an option
     *
     * @param   string  option name
     *
     * @return  mixed   the option value or error object
     *
     * @access  public
     */
    function getOption($option)
    {
        if (array_key_exists($option, $this->options))
        {
            return $this->options[$option];
        }
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, "unknown option $option", __FUNCTION__);
    }

    // }}}
    // {{{ function debug($message, $scope = '', $is_manip = null)


    /**
     * set a debug message
     *
     * @param   string  message that should be appended to the debug variable
     * @param   string  usually the method name that triggered the debug call:
     * for example 'query', 'prepare', 'execute', 'parameters',
     * 'beginTransaction', 'commit', 'rollback'
     * @param   array   contains context information about the debug() call
     * common keys are: is_manip, time, result etc.
     *
     * @return void
     *
     * @access  public
     */
    function debug($message, $scope = '', $context = array())
    {
        if ($this->options['debug'] && $this->options['debug_handler'])
        {
            if (! $this->options['debug_expanded_output'])
            {
                if (! empty($context['when']) && $context['when'] !== 'pre')
                {
                    return null;
                }
                $context = empty($context['is_manip']) ? false : $context['is_manip'];
            }
            return call_user_func_array($this->options['debug_handler'], array(&$this, $scope, $message, $context));
        }
        return null;
    }

    // }}}
    // {{{ function getDebugOutput()


    /**
     * output debug info
     *
     * @return  string  content of the debug_output class variable
     *
     * @access  public
     */
    function getDebugOutput()
    {
        return $this->debug_output;
    }

    // }}}
    // {{{ function escape($text)


    /**
     * Quotes a string so it can be safely used in a query. It will quote
     * the text so it can safely be used within a query.
     *
     * @param   string  the input string to quote
     * @param   bool    escape wildcards
     *
     * @return  string  quoted string
     *
     * @access  public
     */
    function escape($text, $escape_wildcards = false)
    {
        if ($escape_wildcards)
        {
            $text = $this->escapePattern($text);
        }

        $text = str_replace($this->string_quoting['end'], $this->string_quoting['escape'] . $this->string_quoting['end'], $text);
        return $text;
    }

    // }}}
    // {{{ function escapePattern($text)


    /**
     * Quotes pattern (% and _) characters in a string)
     *
     * @param   string  the input string to quote
     *
     * @return  string  quoted string
     *
     * @access  public
     */
    function escapePattern($text)
    {
        if ($this->string_quoting['escape_pattern'])
        {
            $text = str_replace($this->string_quoting['escape_pattern'], $this->string_quoting['escape_pattern'] . $this->string_quoting['escape_pattern'], $text);
            foreach ($this->wildcards as $wildcard)
            {
                $text = str_replace($wildcard, $this->string_quoting['escape_pattern'] . $wildcard, $text);
            }
        }
        return $text;
    }

    // }}}
    // {{{ function quoteIdentifier($str, $check_option = false)


    /**
     * Quote a string so it can be safely used as a table or column name
     *
     * Delimiting style depends on which database driver is being used.
     *
     * NOTE: just because you CAN use delimited identifiers doesn't mean
     * you SHOULD use them.  In general, they end up causing way more
     * problems than they solve.
     *
     * NOTE: if you have table names containing periods, don't use this method
     * (@see bug #11906)
     *
     * Portability is broken by using the following characters inside
     * delimited identifiers:
     * + backtick (<kbd>`</kbd>) -- due to MySQL
     * + double quote (<kbd>"</kbd>) -- due to Oracle
     * + brackets (<kbd>[</kbd> or <kbd>]</kbd>) -- due to Access
     *
     * Delimited identifiers are known to generally work correctly under
     * the following drivers:
     * + mssql
     * + mysql
     * + mysqli
     * + oci8
     * + pgsql
     * + sqlite
     *
     * InterBase doesn't seem to be able to use delimited identifiers
     * via PHP 4.  They work fine under PHP 5.
     *
     * @param   string  identifier name to be quoted
     * @param   bool    check the 'quote_identifier' option
     *
     * @return  string  quoted identifier string
     *
     * @access  public
     */
    function quoteIdentifier($str, $check_option = false)
    {
        if ($check_option && ! $this->options['quote_identifier'])
        {
            return $str;
        }
        $str = str_replace($this->identifier_quoting['end'], $this->identifier_quoting['escape'] . $this->identifier_quoting['end'], $str);
        $parts = explode('.', $str);
        foreach (array_keys($parts) as $k)
        {
            $parts[$k] = $this->identifier_quoting['start'] . $parts[$k] . $this->identifier_quoting['end'];
        }
        return implode('.', $parts);
    }

    // }}}
    // {{{ function getAsKeyword()


    /**
     * Gets the string to alias column
     *
     * @return string to use when aliasing a column
     */
    function getAsKeyword()
    {
        return $this->as_keyword;
    }

    // }}}
    // {{{ function getConnection()


    /**
     * Returns a native connection
     *
     * @return  mixed   a valid MDB2 connection object,
     * or a MDB2 error object on error
     *
     * @access  public
     */
    function getConnection()
    {
        $result = $this->connect();
        if (PEAR :: isError($result))
        {
            return $result;
        }
        return $this->connection;
    }

    // }}}
    // {{{ function _fixResultArrayValues(&$row, $mode)


    /**
     * Do all necessary conversions on result arrays to fix DBMS quirks
     *
     * @param   array   the array to be fixed (passed by reference)
     * @param   array   bit-wise addition of the required portability modes
     *
     * @return  void
     *
     * @access  protected
     */
    function _fixResultArrayValues(&$row, $mode)
    {
        switch ($mode)
        {
            case MDB2_PORTABILITY_EMPTY_TO_NULL :
                foreach ($row as $key => $value)
                {
                    if ($value === '')
                    {
                        $row[$key] = null;
                    }
                }
                break;
            case MDB2_PORTABILITY_RTRIM :
                foreach ($row as $key => $value)
                {
                    if (is_string($value))
                    {
                        $row[$key] = rtrim($value);
                    }
                }
                break;
            case MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES :
                $tmp_row = array();
                foreach ($row as $key => $value)
                {
                    $tmp_row[preg_replace('/^(?:.*\.)?([^.]+)$/', '\\1', $key)] = $value;
                }
                $row = $tmp_row;
                break;
            case (MDB2_PORTABILITY_RTRIM + MDB2_PORTABILITY_EMPTY_TO_NULL) :
                foreach ($row as $key => $value)
                {
                    if ($value === '')
                    {
                        $row[$key] = null;
                    }
                    elseif (is_string($value))
                    {
                        $row[$key] = rtrim($value);
                    }
                }
                break;
            case (MDB2_PORTABILITY_RTRIM + MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES) :
                $tmp_row = array();
                foreach ($row as $key => $value)
                {
                    if (is_string($value))
                    {
                        $value = rtrim($value);
                    }
                    $tmp_row[preg_replace('/^(?:.*\.)?([^.]+)$/', '\\1', $key)] = $value;
                }
                $row = $tmp_row;
                break;
            case (MDB2_PORTABILITY_EMPTY_TO_NULL + MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES) :
                $tmp_row = array();
                foreach ($row as $key => $value)
                {
                    if ($value === '')
                    {
                        $value = null;
                    }
                    $tmp_row[preg_replace('/^(?:.*\.)?([^.]+)$/', '\\1', $key)] = $value;
                }
                $row = $tmp_row;
                break;
            case (MDB2_PORTABILITY_RTRIM + MDB2_PORTABILITY_EMPTY_TO_NULL + MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES) :
                $tmp_row = array();
                foreach ($row as $key => $value)
                {
                    if ($value === '')
                    {
                        $value = null;
                    }
                    elseif (is_string($value))
                    {
                        $value = rtrim($value);
                    }
                    $tmp_row[preg_replace('/^(?:.*\.)?([^.]+)$/', '\\1', $key)] = $value;
                }
                $row = $tmp_row;
                break;
        }
    }

    // }}}
    // {{{ function &loadModule($module, $property = null, $phptype_specific = null)


    /**
     * loads a module
     *
     * @param   string  name of the module that should be loaded
     * (only used for error messages)
     * @param   string  name of the property into which the class will be loaded
     * @param   bool    if the class to load for the module is specific to the
     * phptype
     *
     * @return  object  on success a reference to the given module is returned
     * and on failure a PEAR error
     *
     * @access  public
     */
    function &loadModule($module, $property = null, $phptype_specific = null)
    {
        if (! $property)
        {
            $property = strtolower($module);
        }

        if (! isset($this->{$property}))
        {
            $version = $phptype_specific;
            if ($phptype_specific !== false)
            {
                $version = true;
                $class_name = 'MDB2_Driver_' . $module . '_' . $this->phptype;
                $file_name = str_replace('_', DIRECTORY_SEPARATOR, $class_name) . '.php';
            }
            if ($phptype_specific === false || (! MDB2 :: classExists($class_name) && ! MDB2 :: fileExists($file_name)))
            {
                $version = false;
                $class_name = 'MDB2_' . $module;
                $file_name = str_replace('_', DIRECTORY_SEPARATOR, $class_name) . '.php';
            }

            $err = MDB2 :: loadClass($class_name, $this->getOption('debug'));
            if (PEAR :: isError($err))
            {
                return $err;
            }

            // load module in a specific version
            if ($version)
            {
                if (method_exists($class_name, 'getClassName'))
                {
                    $class_name_new = call_user_func(array($class_name, 'getClassName'), $this->db_index);
                    if ($class_name != $class_name_new)
                    {
                        $class_name = $class_name_new;
                        $err = MDB2 :: loadClass($class_name, $this->getOption('debug'));
                        if (PEAR :: isError($err))
                        {
                            return $err;
                        }
                    }
                }
            }

            if (! MDB2 :: classExists($class_name))
            {
                $err = & $this->raiseError(MDB2_ERROR_LOADMODULE, null, null, "unable to load module '$module' into property '$property'", __FUNCTION__);
                return $err;
            }
            $this->{$property} = new $class_name($this->db_index);
            $this->modules[$module] = & $this->{$property};
            if ($version)
            {
                // this will be used in the connect method to determine if the module
                // needs to be loaded with a different version if the server
                // version changed in between connects
                $this->loaded_version_modules[] = $property;
            }
        }

        return $this->{$property};
    }

    // }}}
    // {{{ function __call($method, $params)


    /**
     * Calls a module method using the __call magic method
     *
     * @param   string  Method name.
     * @param   array   Arguments.
     *
     * @return  mixed   Returned value.
     */
    function __call($method, $params)
    {
        $module = null;
        if (preg_match('/^([a-z]+)([A-Z])(.*)$/', $method, $match) && isset($this->options['modules'][$match[1]]))
        {
            $module = $this->options['modules'][$match[1]];
            $method = strtolower($match[2]) . $match[3];
            if (! isset($this->modules[$module]) || ! is_object($this->modules[$module]))
            {
                $result = & $this->loadModule($module);
                if (PEAR :: isError($result))
                {
                    return $result;
                }
            }
        }
        else
        {
            foreach ($this->modules as $key => $foo)
            {
                if (is_object($this->modules[$key]) && method_exists($this->modules[$key], $method))
                {
                    $module = $key;
                    break;
                }
            }
        }
        if (! is_null($module))
        {
            return call_user_func_array(array(&$this->modules[$module], $method), $params);
        }
        trigger_error(sprintf('Call to undefined function: %s::%s().', get_class($this), $method), E_USER_ERROR);
    }

    // }}}
    // {{{ function beginTransaction($savepoint = null)


    /**
     * Start a transaction or set a savepoint.
     *
     * @param   string  name of a savepoint to set
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function beginTransaction($savepoint = null)
    {
        $this->debug('Starting transaction', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'transactions are not supported', __FUNCTION__);
    }

    // }}}
    // {{{ function commit($savepoint = null)


    /**
     * Commit the database changes done during a transaction that is in
     * progress or release a savepoint. This function may only be called when
     * auto-committing is disabled, otherwise it will fail. Therefore, a new
     * transaction is implicitly started after committing the pending changes.
     *
     * @param   string  name of a savepoint to release
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function commit($savepoint = null)
    {
        $this->debug('Committing transaction/savepoint', __FUNCTION__, array('is_manip' => true,
                'savepoint' => $savepoint));
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'commiting transactions is not supported', __FUNCTION__);
    }

    // }}}
    // {{{ function rollback($savepoint = null)


    /**
     * Cancel any database changes done during a transaction or since a specific
     * savepoint that is in progress. This function may only be called when
     * auto-committing is disabled, otherwise it will fail. Therefore, a new
     * transaction is implicitly started after canceling the pending changes.
     *
     * @param   string  name of a savepoint to rollback to
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function rollback($savepoint = null)
    {
        $this->debug('Rolling back transaction/savepoint', __FUNCTION__, array('is_manip' => true,
                'savepoint' => $savepoint));
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'rolling back transactions is not supported', __FUNCTION__);
    }

    // }}}
    // {{{ function inTransaction($ignore_nested = false)


    /**
     * If a transaction is currently open.
     *
     * @param   bool    if the nested transaction count should be ignored
     * @return  int|bool    - an integer with the nesting depth is returned if a
     * nested transaction is open
     * - true is returned for a normal open transaction
     * - false is returned if no transaction is open
     *
     * @access  public
     */
    function inTransaction($ignore_nested = false)
    {
        if (! $ignore_nested && isset($this->nested_transaction_counter))
        {
            return $this->nested_transaction_counter;
        }
        return $this->in_transaction;
    }

    // }}}
    // {{{ function setTransactionIsolation($isolation)


    /**
     * Set the transacton isolation level.
     *
     * @param   string  standard isolation level
     * READ UNCOMMITTED (allows dirty reads)
     * READ COMMITTED (prevents dirty reads)
     * REPEATABLE READ (prevents nonrepeatable reads)
     * SERIALIZABLE (prevents phantom reads)
     * @param   array some transaction options:
     * 'wait' => 'WAIT' | 'NO WAIT'
     * 'rw'   => 'READ WRITE' | 'READ ONLY'
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     * @since   2.1.1
     */
    function setTransactionIsolation($isolation, $options = array())
    {
        $this->debug('Setting transaction isolation level', __FUNCTION__, array('is_manip' => true));
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'isolation level setting is not supported', __FUNCTION__);
    }

    // }}}
    // {{{ function beginNestedTransaction($savepoint = false)


    /**
     * Start a nested transaction.
     *
     * @return  mixed   MDB2_OK on success/savepoint name, a MDB2 error on failure
     *
     * @access  public
     * @since   2.1.1
     */
    function beginNestedTransaction()
    {
        if ($this->in_transaction)
        {
            ++ $this->nested_transaction_counter;
            $savepoint = sprintf($this->options['savepoint_format'], $this->nested_transaction_counter);
            if ($this->supports('savepoints') && $savepoint)
            {
                return $this->beginTransaction($savepoint);
            }
            return MDB2_OK;
        }
        $this->has_transaction_error = false;
        $result = $this->beginTransaction();
        $this->nested_transaction_counter = 1;
        return $result;
    }

    // }}}
    // {{{ function completeNestedTransaction($force_rollback = false, $release = false)


    /**
     * Finish a nested transaction by rolling back if an error occured or
     * committing otherwise.
     *
     * @param   bool    if the transaction should be rolled back regardless
     * even if no error was set within the nested transaction
     * @return  mixed   MDB_OK on commit/counter decrementing, false on rollback
     * and a MDB2 error on failure
     *
     * @access  public
     * @since   2.1.1
     */
    function completeNestedTransaction($force_rollback = false)
    {
        if ($this->nested_transaction_counter > 1)
        {
            $savepoint = sprintf($this->options['savepoint_format'], $this->nested_transaction_counter);
            if ($this->supports('savepoints') && $savepoint)
            {
                if ($force_rollback || $this->has_transaction_error)
                {
                    $result = $this->rollback($savepoint);
                    if (! PEAR :: isError($result))
                    {
                        $result = false;
                        $this->has_transaction_error = false;
                    }
                }
                else
                {
                    $result = $this->commit($savepoint);
                }
            }
            else
            {
                $result = MDB2_OK;
            }
            -- $this->nested_transaction_counter;
            return $result;
        }

        $this->nested_transaction_counter = null;
        $result = MDB2_OK;

        // transaction has not yet been rolled back
        if ($this->in_transaction)
        {
            if ($force_rollback || $this->has_transaction_error)
            {
                $result = $this->rollback();
                if (! PEAR :: isError($result))
                {
                    $result = false;
                }
            }
            else
            {
                $result = $this->commit();
            }
        }
        $this->has_transaction_error = false;
        return $result;
    }

    // }}}
    // {{{ function failNestedTransaction($error = null, $immediately = false)


    /**
     * Force setting nested transaction to failed.
     *
     * @param   mixed   value to return in getNestededTransactionError()
     * @param   bool    if the transaction should be rolled back immediately
     * @return  bool    MDB2_OK
     *
     * @access  public
     * @since   2.1.1
     */
    function failNestedTransaction($error = null, $immediately = false)
    {
        if (is_null($error))
        {
            $error = $this->has_transaction_error ? $this->has_transaction_error : true;
        }
        elseif (! $error)
        {
            $error = true;
        }
        $this->has_transaction_error = $error;
        if (! $immediately)
        {
            return MDB2_OK;
        }
        return $this->rollback();
    }

    // }}}
    // {{{ function getNestedTransactionError()


    /**
     * The first error that occured since the transaction start.
     *
     * @return  MDB2_Error|bool     MDB2 error object if an error occured or false.
     *
     * @access  public
     * @since   2.1.1
     */
    function getNestedTransactionError()
    {
        return $this->has_transaction_error;
    }

    // }}}
    // {{{ connect()


    /**
     * Connect to the database
     *
     * @return true on success, MDB2 Error Object on failure
     */
    function connect()
    {
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ databaseExists()


    /**
     * check if given database name is exists?
     *
     * @param string $name    name of the database that should be checked
     *
     * @return mixed true/false on success, a MDB2 error on failure
     * @access public
     */
    function databaseExists($name)
    {
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ setCharset($charset, $connection = null)


    /**
     * Set the charset on the current connection
     *
     * @param string    charset
     * @param resource  connection handle
     *
     * @return true on success, MDB2 Error Object on failure
     */
    function setCharset($charset, $connection = null)
    {
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function disconnect($force = true)


    /**
     * Log out and disconnect from the database.
     *
     * @param boolean $force whether the disconnect should be forced even if the
     * connection is opened persistently
     *
     * @return mixed true on success, false if not connected and error object on error
     *
     * @access  public
     */
    function disconnect($force = true)
    {
        $this->connection = 0;
        $this->connected_dsn = array();
        $this->connected_database_name = '';
        $this->opened_persistent = null;
        $this->connected_server_info = '';
        $this->in_transaction = null;
        $this->nested_transaction_counter = null;
        return MDB2_OK;
    }

    // }}}
    // {{{ function setDatabase($name)


    /**
     * Select a different database
     *
     * @param   string  name of the database that should be selected
     *
     * @return  string  name of the database previously connected to
     *
     * @access  public
     */
    function setDatabase($name)
    {
        $previous_database_name = (isset($this->database_name)) ? $this->database_name : '';
        $this->database_name = $name;
        if (! empty($this->connected_database_name) && ($this->connected_database_name != $this->database_name))
        {
            $this->disconnect(false);
        }
        return $previous_database_name;
    }

    // }}}
    // {{{ function getDatabase()


    /**
     * Get the current database
     *
     * @return  string  name of the database
     *
     * @access  public
     */
    function getDatabase()
    {
        return $this->database_name;
    }

    // }}}
    // {{{ function setDSN($dsn)


    /**
     * set the DSN
     *
     * @param   mixed   DSN string or array
     *
     * @return  MDB2_OK
     *
     * @access  public
     */
    function setDSN($dsn)
    {
        $dsn_default = $GLOBALS['_MDB2_dsninfo_default'];
        $dsn = MDB2 :: parseDSN($dsn);
        if (array_key_exists('database', $dsn))
        {
            $this->database_name = $dsn['database'];
            unset($dsn['database']);
        }
        $this->dsn = array_merge($dsn_default, $dsn);
        return $this->disconnect(false);
    }

    // }}}
    // {{{ function getDSN($type = 'string', $hidepw = false)


    /**
     * return the DSN as a string
     *
     * @param   string  format to return ("array", "string")
     * @param   string  string to hide the password with
     *
     * @return  mixed   DSN in the chosen type
     *
     * @access  public
     */
    function getDSN($type = 'string', $hidepw = false)
    {
        $dsn = array_merge($GLOBALS['_MDB2_dsninfo_default'], $this->dsn);
        $dsn['phptype'] = $this->phptype;
        $dsn['database'] = $this->database_name;
        if ($hidepw)
        {
            $dsn['password'] = $hidepw;
        }
        switch ($type)
        {
            // expand to include all possible options
            case 'string' :
                $dsn = $dsn['phptype'] . ($dsn['dbsyntax'] ? ('(' . $dsn['dbsyntax'] . ')') : '') . '://' . $dsn['username'] . ':' . $dsn['password'] . '@' . $dsn['hostspec'] . ($dsn['port'] ? (':' . $dsn['port']) : '') . '/' . $dsn['database'];
                break;
            case 'array' :
            default :
                break;
        }
        return $dsn;
    }

    // }}}
    // {{{ _isNewLinkSet()


    /**
     * Check if the 'new_link' option is set
     *
     * @return boolean
     *
     * @access protected
     */
    function _isNewLinkSet()
    {
        return (isset($this->dsn['new_link']) && ($this->dsn['new_link'] === true || (is_string($this->dsn['new_link']) && preg_match('/^true$/i', $this->dsn['new_link'])) || (is_numeric($this->dsn['new_link']) && 0 != (int) $this->dsn['new_link'])));
    }

    // }}}
    // {{{ function &standaloneQuery($query, $types = null, $is_manip = false)


    /**
     * execute a query as database administrator
     *
     * @param   string  the SQL query
     * @param   mixed   array that contains the types of the columns in
     * the result set
     * @param   bool    if the query is a manipulation query
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function &standaloneQuery($query, $types = null, $is_manip = false)
    {
        $offset = $this->offset;
        $limit = $this->limit;
        $this->offset = $this->limit = 0;
        $query = $this->_modifyQuery($query, $is_manip, $limit, $offset);

        $connection = $this->getConnection();
        if (PEAR :: isError($connection))
        {
            return $connection;
        }

        $result = & $this->_doQuery($query, $is_manip, $connection, false);
        if (PEAR :: isError($result))
        {
            return $result;
        }

        if ($is_manip)
        {
            $affected_rows = $this->_affectedRows($connection, $result);
            return $affected_rows;
        }
        $result = & $this->_wrapResult($result, $types, true, false, $limit, $offset);
        return $result;
    }

    // }}}
    // {{{ function _modifyQuery($query, $is_manip, $limit, $offset)


    /**
     * Changes a query string for various DBMS specific reasons
     *
     * @param   string  query to modify
     * @param   bool    if it is a DML query
     * @param   int  limit the number of rows
     * @param   int  start reading from given offset
     *
     * @return  string  modified query
     *
     * @access  protected
     */
    function _modifyQuery($query, $is_manip, $limit, $offset)
    {
        return $query;
    }

    // }}}
    // {{{ function &_doQuery($query, $is_manip = false, $connection = null, $database_name = null)


    /**
     * Execute a query
     * @param   string  query
     * @param   bool    if the query is a manipulation query
     * @param   resource connection handle
     * @param   string  database name
     *
     * @return  result or error object
     *
     * @access  protected
     */
    function &_doQuery($query, $is_manip = false, $connection = null, $database_name = null)
    {
        $this->last_query = $query;
        $result = $this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'pre'));
        if ($result)
        {
            if (PEAR :: isError($result))
            {
                return $result;
            }
            $query = $result;
        }
        $err = & $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
        return $err;
    }

    // }}}
    // {{{ function _affectedRows($connection, $result = null)


    /**
     * Returns the number of rows affected
     *
     * @param   resource result handle
     * @param   resource connection handle
     *
     * @return  mixed   MDB2 Error Object or the number of rows affected
     *
     * @access  private
     */
    function _affectedRows($connection, $result = null)
    {
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function &exec($query)


    /**
     * Execute a manipulation query to the database and return the number of affected rows
     *
     * @param   string  the SQL query
     *
     * @return  mixed   number of affected rows on success, a MDB2 error on failure
     *
     * @access  public
     */
    function &exec($query)
    {
        $offset = $this->offset;
        $limit = $this->limit;
        $this->offset = $this->limit = 0;
        $query = $this->_modifyQuery($query, true, $limit, $offset);

        $connection = $this->getConnection();
        if (PEAR :: isError($connection))
        {
            return $connection;
        }

        $result = & $this->_doQuery($query, true, $connection, $this->database_name);
        if (PEAR :: isError($result))
        {
            return $result;
        }

        $affectedRows = $this->_affectedRows($connection, $result);
        return $affectedRows;
    }

    // }}}
    // {{{ function &query($query, $types = null, $result_class = true, $result_wrap_class = false)


    /**
     * Send a query to the database and return any results
     *
     * @param   string  the SQL query
     * @param   mixed   array that contains the types of the columns in
     * the result set
     * @param   mixed   string which specifies which result class to use
     * @param   mixed   string which specifies which class to wrap results in
     *
     * @return mixed   an MDB2_Result handle on success, a MDB2 error on failure
     *
     * @access  public
     */
    function &query($query, $types = null, $result_class = true, $result_wrap_class = false)
    {
        $offset = $this->offset;
        $limit = $this->limit;
        $this->offset = $this->limit = 0;
        $query = $this->_modifyQuery($query, false, $limit, $offset);

        $connection = $this->getConnection();
        if (PEAR :: isError($connection))
        {
            return $connection;
        }

        $result = & $this->_doQuery($query, false, $connection, $this->database_name);
        if (PEAR :: isError($result))
        {
            return $result;
        }

        $result = & $this->_wrapResult($result, $types, $result_class, $result_wrap_class, $limit, $offset);
        return $result;
    }

    // }}}
    // {{{ function &_wrapResult($result, $types = array(), $result_class = true, $result_wrap_class = false, $limit = null, $offset = null)


    /**
     * wrap a result set into the correct class
     *
     * @param   resource result handle
     * @param   mixed   array that contains the types of the columns in
     * the result set
     * @param   mixed   string which specifies which result class to use
     * @param   mixed   string which specifies which class to wrap results in
     * @param   string  number of rows to select
     * @param   string  first row to select
     *
     * @return mixed   an MDB2_Result, a MDB2 error on failure
     *
     * @access  protected
     */
    function &_wrapResult($result, $types = array(), $result_class = true, $result_wrap_class = false, $limit = null, $offset = null)
    {
        if ($types === true)
        {
            if ($this->supports('result_introspection'))
            {
                $this->loadModule('Reverse', null, true);
                $tableInfo = $this->reverse->tableInfo($result);
                if (PEAR :: isError($tableInfo))
                {
                    return $tableInfo;
                }
                $types = array();
                $types_assoc = array();
                foreach ($tableInfo as $field)
                {
                    $types[] = $field['mdb2type'];
                    $types_assoc[$field['name']] = $field['mdb2type'];
                }
            }
            else
            {
                $types = null;
            }
        }

        if ($result_class === true)
        {
            $result_class = $this->options['result_buffering'] ? $this->options['buffered_result_class'] : $this->options['result_class'];
        }

        if ($result_class)
        {
            $class_name = sprintf($result_class, $this->phptype);
            if (! MDB2 :: classExists($class_name))
            {
                $err = & $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'result class does not exist ' . $class_name, __FUNCTION__);
                return $err;
            }
            $reference_result = new $class_name($this, $result, $limit, $offset);
            $result = &$reference_result;
            if (! MDB2 :: isResultCommon($result))
            {
                $err = & $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'result class is not extended from MDB2_Result_Common', __FUNCTION__);
                return $err;
            }
            if (! empty($types))
            {
                $err = $result->setResultTypes($types);
                if (PEAR :: isError($err))
                {
                    $result->free();
                    return $err;
                }
            }
            if (! empty($types_assoc))
            {
                $err = $result->setResultTypesAssoc($types_assoc);
                if (PEAR :: isError($err))
                {
                    $result->free();
                    return $err;
                }
            }
        }
        if ($result_wrap_class === true)
        {
            $result_wrap_class = $this->options['result_wrap_class'];
        }
        if ($result_wrap_class)
        {
            if (! MDB2 :: classExists($result_wrap_class))
            {
                $err = & $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'result wrap class does not exist ' . $result_wrap_class, __FUNCTION__);
                return $err;
            }
            $result = new $result_wrap_class($result, $this->fetchmode);
        }
        return $result;
    }

    // }}}
    // {{{ function getServerVersion($native = false)


    /**
     * return version information about the server
     *
     * @param   bool    determines if the raw version string should be returned
     *
     * @return  mixed   array with version information or row string
     *
     * @access  public
     */
    function getServerVersion($native = false)
    {
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function setLimit($limit, $offset = null)


    /**
     * set the range of the next query
     *
     * @param   string  number of rows to select
     * @param   string  first row to select
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function setLimit($limit, $offset = null)
    {
        if (! $this->supports('limit_queries'))
        {
            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'limit is not supported by this driver', __FUNCTION__);
        }
        $limit = (int) $limit;
        if ($limit < 0)
        {
            return $this->raiseError(MDB2_ERROR_SYNTAX, null, null, 'it was not specified a valid selected range row limit', __FUNCTION__);
        }
        $this->limit = $limit;
        if (! is_null($offset))
        {
            $offset = (int) $offset;
            if ($offset < 0)
            {
                return $this->raiseError(MDB2_ERROR_SYNTAX, null, null, 'it was not specified a valid first selected range row', __FUNCTION__);
            }
            $this->offset = $offset;
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function subSelect($query, $type = false)


    /**
     * simple subselect emulation: leaves the query untouched for all RDBMS
     * that support subselects
     *
     * @param   string  the SQL query for the subselect that may only
     * return a column
     * @param   string  determines type of the field
     *
     * @return  string  the query
     *
     * @access  public
     */
    function subSelect($query, $type = false)
    {
        if ($this->supports('sub_selects') === true)
        {
            return $query;
        }

        if (! $this->supports('sub_selects'))
        {
            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
        }

        $col = $this->queryCol($query, $type);
        if (PEAR :: isError($col))
        {
            return $col;
        }
        if (! is_array($col) || count($col) == 0)
        {
            return 'NULL';
        }
        if ($type)
        {
            $this->loadModule('Datatype', null, true);
            return $this->datatype->implodeArray($col, $type);
        }
        return implode(', ', $col);
    }

    // }}}
    // {{{ function replace($table, $fields)


    /**
     * Execute a SQL REPLACE query. A REPLACE query is identical to a INSERT
     * query, except that if there is already a row in the table with the same
     * key field values, the old row is deleted before the new row is inserted.
     *
     * The REPLACE type of query does not make part of the SQL standards. Since
     * practically only MySQL and SQLite implement it natively, this type of
     * query isemulated through this method for other DBMS using standard types
     * of queries inside a transaction to assure the atomicity of the operation.
     *
     * @param   string  name of the table on which the REPLACE query will
     * be executed.
     * @param   array   associative array   that describes the fields and the
     * values that will be inserted or updated in the specified table. The
     * indexes of the array are the names of all the fields of the table.
     * The values of the array are also associative arrays that describe
     * the values and other properties of the table fields.
     *
     * Here follows a list of field properties that need to be specified:
     *
     * value
     * Value to be assigned to the specified field. This value may be
     * of specified in database independent type format as this
     * function can perform the necessary datatype conversions.
     *
     * Default: this property is required unless the Null property is
     * set to 1.
     *
     * type
     * Name of the type of the field. Currently, all types MDB2
     * are supported except for clob and blob.
     *
     * Default: no type conversion
     *
     * null
     * bool    property that indicates that the value for this field
     * should be set to null.
     *
     * The default value for fields missing in INSERT queries may be
     * specified the definition of a table. Often, the default value
     * is already null, but since the REPLACE may be emulated using
     * an UPDATE query, make sure that all fields of the table are
     * listed in this function argument array.
     *
     * Default: 0
     *
     * key
     * bool    property that indicates that this field should be
     * handled as a primary key or at least as part of the compound
     * unique index of the table that will determine the row that will
     * updated if it exists or inserted a new row otherwise.
     *
     * This function will fail if no key field is specified or if the
     * value of a key field is set to null because fields that are
     * part of unique index they may not be null.
     *
     * Default: 0
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function replace($table, $fields)
    {
        if (! $this->supports('replace'))
        {
            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'replace query is not supported', __FUNCTION__);
        }
        $count = count($fields);
        $condition = $values = array();
        for($colnum = 0, reset($fields); $colnum < $count; next($fields), $colnum ++)
        {
            $name = key($fields);
            if (isset($fields[$name]['null']) && $fields[$name]['null'])
            {
                $value = 'NULL';
            }
            else
            {
                $type = isset($fields[$name]['type']) ? $fields[$name]['type'] : null;
                $value = $this->quote($fields[$name]['value'], $type);
            }
            $values[$name] = $value;
            if (isset($fields[$name]['key']) && $fields[$name]['key'])
            {
                if ($value === 'NULL')
                {
                    return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null, 'key value ' . $name . ' may not be NULL', __FUNCTION__);
                }
                $condition[] = $this->quoteIdentifier($name, true) . '=' . $value;
            }
        }
        if (empty($condition))
        {
            return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null, 'not specified which fields are keys', __FUNCTION__);
        }

        $result = null;
        $in_transaction = $this->in_transaction;
        if (! $in_transaction && PEAR :: isError($result = $this->beginTransaction()))
        {
            return $result;
        }

        $connection = $this->getConnection();
        if (PEAR :: isError($connection))
        {
            return $connection;
        }

        $condition = ' WHERE ' . implode(' AND ', $condition);
        $query = 'DELETE FROM ' . $this->quoteIdentifier($table, true) . $condition;
        $result = & $this->_doQuery($query, true, $connection);
        if (! PEAR :: isError($result))
        {
            $affected_rows = $this->_affectedRows($connection, $result);
            $insert = '';
            foreach ($values as $key => $value)
            {
                $insert .= ($insert ? ', ' : '') . $this->quoteIdentifier($key, true);
            }
            $values = implode(', ', $values);
            $query = 'INSERT INTO ' . $this->quoteIdentifier($table, true) . "($insert) VALUES ($values)";
            $result = & $this->_doQuery($query, true, $connection);
            if (! PEAR :: isError($result))
            {
                $affected_rows += $this->_affectedRows($connection, $result);
                ;
            }
        }

        if (! $in_transaction)
        {
            if (PEAR :: isError($result))
            {
                $this->rollback();
            }
            else
            {
                $result = $this->commit();
            }
        }

        if (PEAR :: isError($result))
        {
            return $result;
        }

        return $affected_rows;
    }

    // }}}
    // {{{ function &prepare($query, $types = null, $result_types = null, $lobs = array())


    /**
     * Prepares a query for multiple execution with execute().
     * With some database backends, this is emulated.
     * prepare() requires a generic query as string like
     * 'INSERT INTO numbers VALUES(?,?)' or
     * 'INSERT INTO numbers VALUES(:foo,:bar)'.
     * The ? and :name and are placeholders which can be set using
     * bindParam() and the query can be sent off using the execute() method.
     * The allowed format for :name can be set with the 'bindname_format' option.
     *
     * @param   string  the query to prepare
     * @param   mixed   array that contains the types of the placeholders
     * @param   mixed   array that contains the types of the columns in
     * the result set or MDB2_PREPARE_RESULT, if set to
     * MDB2_PREPARE_MANIP the query is handled as a manipulation query
     * @param   mixed   key (field) value (parameter) pair for all lob placeholders
     *
     * @return  mixed   resource handle for the prepared query on success,
     * a MDB2 error on failure
     *
     * @access  public
     * @see     bindParam, execute
     */
    function &prepare($query, $types = null, $result_types = null, $lobs = array())
    {
        $is_manip = ($result_types === MDB2_PREPARE_MANIP);
        $offset = $this->offset;
        $limit = $this->limit;
        $this->offset = $this->limit = 0;
        $result = $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'pre'));
        if ($result)
        {
            if (PEAR :: isError($result))
            {
                return $result;
            }
            $query = $result;
        }
        $placeholder_type_guess = $placeholder_type = null;
        $question = '?';
        $colon = ':';
        $positions = array();
        $position = 0;
        while ($position < strlen($query))
        {
            $q_position = strpos($query, $question, $position);
            $c_position = strpos($query, $colon, $position);
            if ($q_position && $c_position)
            {
                $p_position = min($q_position, $c_position);
            }
            elseif ($q_position)
            {
                $p_position = $q_position;
            }
            elseif ($c_position)
            {
                $p_position = $c_position;
            }
            else
            {
                break;
            }
            if (is_null($placeholder_type))
            {
                $placeholder_type_guess = $query[$p_position];
            }

            $new_pos = $this->_skipDelimitedStrings($query, $position, $p_position);
            if (PEAR :: isError($new_pos))
            {
                return $new_pos;
            }
            if ($new_pos != $position)
            {
                $position = $new_pos;
                continue; //evaluate again starting from the new position
            }

            if ($query[$position] == $placeholder_type_guess)
            {
                if (is_null($placeholder_type))
                {
                    $placeholder_type = $query[$p_position];
                    $question = $colon = $placeholder_type;
                    if (! empty($types) && is_array($types))
                    {
                        if ($placeholder_type == ':')
                        {
                            if (is_int(key($types)))
                            {
                                $types_tmp = $types;
                                $types = array();
                                $count = - 1;
                            }
                        }
                        else
                        {
                            $types = array_values($types);
                        }
                    }
                }
                if ($placeholder_type == ':')
                {
                    $regexp = '/^.{' . ($position + 1) . '}(' . $this->options['bindname_format'] . ').*$/s';
                    $parameter = preg_replace($regexp, '\\1', $query);
                    if ($parameter === '')
                    {
                        $err = & $this->raiseError(MDB2_ERROR_SYNTAX, null, null, 'named parameter name must match "bindname_format" option', __FUNCTION__);
                        return $err;
                    }
                    $positions[$p_position] = $parameter;
                    $query = substr_replace($query, '?', $position, strlen($parameter) + 1);
                    // use parameter name in type array
                    if (isset($count) && isset($types_tmp[++ $count]))
                    {
                        $types[$parameter] = $types_tmp[$count];
                    }
                }
                else
                {
                    $positions[$p_position] = count($positions);
                }
                $position = $p_position + 1;
            }
            else
            {
                $position = $p_position;
            }
        }
        $class_name = 'MDB2_Statement_' . $this->phptype;
        $statement = null;
        $obj = new $class_name($this, $statement, $positions, $query, $types, $result_types, $is_manip, $limit, $offset);
        $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'post', 'result' => $obj));
        return $obj;
    }

    // }}}
    // {{{ function _skipDelimitedStrings($query, $position, $p_position)


    /**
     * Utility method, used by prepare() to avoid replacing placeholders within delimited strings.
     * Check if the placeholder is contained within a delimited string.
     * If so, skip it and advance the position, otherwise return the current position,
     * which is valid
     *
     * @param string $query
     * @param integer $position current string cursor position
     * @param integer $p_position placeholder position
     *
     * @return mixed integer $new_position on success
     * MDB2_Error on failure
     *
     * @access  protected
     */
    function _skipDelimitedStrings($query, $position, $p_position)
    {
        $ignores = $this->string_quoting;
        $ignores[] = $this->identifier_quoting;
        $ignores = array_merge($ignores, $this->sql_comments);

        foreach ($ignores as $ignore)
        {
            if (! empty($ignore['start']))
            {
                if (is_int($start_quote = strpos($query, $ignore['start'], $position)) && $start_quote < $p_position)
                {
                    $end_quote = $start_quote;
                    do
                    {
                        if (! is_int($end_quote = strpos($query, $ignore['end'], $end_quote + 1)))
                        {
                            if ($ignore['end'] === "\n")
                            {
                                $end_quote = strlen($query) - 1;
                            }
                            else
                            {
                                $err = & $this->raiseError(MDB2_ERROR_SYNTAX, null, null, 'query with an unterminated text string specified', __FUNCTION__);
                                return $err;
                            }
                        }
                    }
                    while ($ignore['escape'] && $end_quote - 1 != $start_quote && $query[($end_quote - 1)] == $ignore['escape'] && ($ignore['escape_pattern'] !== $ignore['escape'] || $query[($end_quote - 2)] != $ignore['escape']));

                    $position = $end_quote + 1;
                    return $position;
                }
            }
        }
        return $position;
    }

    // }}}
    // {{{ function quote($value, $type = null, $quote = true)


    /**
     * Convert a text value into a DBMS specific format that is suitable to
     * compose query statements.
     *
     * @param   string  text string value that is intended to be converted.
     * @param   string  type to which the value should be converted to
     * @param   bool    quote
     * @param   bool    escape wildcards
     *
     * @return  string  text string that represents the given argument value in
     * a DBMS specific format.
     *
     * @access  public
     */
    function quote($value, $type = null, $quote = true, $escape_wildcards = false)
    {
        $result = $this->loadModule('Datatype', null, true);
        if (PEAR :: isError($result))
        {
            return $result;
        }

        return $this->datatype->quote($value, $type, $quote, $escape_wildcards);
    }

    // }}}
    // {{{ function getDeclaration($type, $name, $field)


    /**
     * Obtain DBMS specific SQL code portion needed to declare
     * of the given type
     *
     * @param   string  type to which the value should be converted to
     * @param   string  name the field to be declared.
     * @param   string  definition of the field
     *
     * @return  string  DBMS specific SQL code portion that should be used to
     * declare the specified field.
     *
     * @access  public
     */
    function getDeclaration($type, $name, $field)
    {
        $result = $this->loadModule('Datatype', null, true);
        if (PEAR :: isError($result))
        {
            return $result;
        }
        return $this->datatype->getDeclaration($type, $name, $field);
    }

    // }}}
    // {{{ function compareDefinition($current, $previous)


    /**
     * Obtain an array of changes that may need to applied
     *
     * @param   array   new definition
     * @param   array   old definition
     *
     * @return  array   containing all changes that will need to be applied
     *
     * @access  public
     */
    function compareDefinition($current, $previous)
    {
        $result = $this->loadModule('Datatype', null, true);
        if (PEAR :: isError($result))
        {
            return $result;
        }
        return $this->datatype->compareDefinition($current, $previous);
    }

    // }}}
    // {{{ function supports($feature)


    /**
     * Tell whether a DB implementation or its backend extension
     * supports a given feature.
     *
     * @param   string  name of the feature (see the MDB2 class doc)
     *
     * @return  bool|string if this DB implementation supports a given feature
     * false means no, true means native,
     * 'emulated' means emulated
     *
     * @access  public
     */
    function supports($feature)
    {
        if (array_key_exists($feature, $this->supported))
        {
            return $this->supported[$feature];
        }
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, "unknown support feature $feature", __FUNCTION__);
    }

    // }}}
    // {{{ function getSequenceName($sqn)


    /**
     * adds sequence name formatting to a sequence name
     *
     * @param   string  name of the sequence
     *
     * @return  string  formatted sequence name
     *
     * @access  public
     */
    function getSequenceName($sqn)
    {
        return sprintf($this->options['seqname_format'], preg_replace('/[^a-z0-9_\-\$.]/i', '_', $sqn));
    }

    // }}}
    // {{{ function getIndexName($idx)


    /**
     * adds index name formatting to a index name
     *
     * @param   string  name of the index
     *
     * @return  string  formatted index name
     *
     * @access  public
     */
    function getIndexName($idx)
    {
        return sprintf($this->options['idxname_format'], preg_replace('/[^a-z0-9_\-\$.]/i', '_', $idx));
    }

    // }}}
    // {{{ function nextID($seq_name, $ondemand = true)


    /**
     * Returns the next free id of a sequence
     *
     * @param   string  name of the sequence
     * @param   bool    when true missing sequences are automatic created
     *
     * @return  mixed   MDB2 Error Object or id
     *
     * @access  public
     */
    function nextID($seq_name, $ondemand = true)
    {
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function lastInsertID($table = null, $field = null)


    /**
     * Returns the autoincrement ID if supported or $id or fetches the current
     * ID in a sequence called: $table.(empty($field) ? '' : '_'.$field)
     *
     * @param   string  name of the table into which a new row was inserted
     * @param   string  name of the field into which a new row was inserted
     *
     * @return  mixed   MDB2 Error Object or id
     *
     * @access  public
     */
    function lastInsertID($table = null, $field = null)
    {
        return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function currID($seq_name)


    /**
     * Returns the current id of a sequence
     *
     * @param   string  name of the sequence
     *
     * @return  mixed   MDB2 Error Object or id
     *
     * @access  public
     */
    function currID($seq_name)
    {
        $this->warnings[] = 'database does not support getting current
            sequence value, the sequence value was incremented';
        return $this->nextID($seq_name);
    }

    // }}}
    // {{{ function queryOne($query, $type = null, $colnum = 0)


    /**
     * Execute the specified query, fetch the value from the first column of
     * the first row of the result set and then frees
     * the result set.
     *
     * @param string $query  the SELECT query statement to be executed.
     * @param string $type   optional argument that specifies the expected
     * datatype of the result set field, so that an eventual
     * conversion may be performed. The default datatype is
     * text, meaning that no conversion is performed
     * @param mixed  $colnum the column number (or name) to fetch
     *
     * @return  mixed   MDB2_OK or field value on success, a MDB2 error on failure
     *
     * @access  public
     */
    function queryOne($query, $type = null, $colnum = 0)
    {
        $result = $this->query($query, $type);
        if (! MDB2 :: isResultCommon($result))
        {
            return $result;
        }

        $one = $result->fetchOne($colnum);
        $result->free();
        return $one;
    }

    // }}}
    // {{{ function queryRow($query, $types = null, $fetchmode = MDB2_FETCHMODE_DEFAULT)


    /**
     * Execute the specified query, fetch the values from the first
     * row of the result set into an array and then frees
     * the result set.
     *
     * @param   string  the SELECT query statement to be executed.
     * @param   array   optional array argument that specifies a list of
     * expected datatypes of the result set columns, so that the eventual
     * conversions may be performed. The default list of datatypes is
     * empty, meaning that no conversion is performed.
     * @param   int     how the array data should be indexed
     *
     * @return  mixed   MDB2_OK or data array on success, a MDB2 error on failure
     *
     * @access  public
     */
    function queryRow($query, $types = null, $fetchmode = MDB2_FETCHMODE_DEFAULT)
    {
        $result = $this->query($query, $types);
        if (! MDB2 :: isResultCommon($result))
        {
            return $result;
        }

        $row = $result->fetchRow($fetchmode);
        $result->free();
        return $row;
    }

    // }}}
    // {{{ function queryCol($query, $type = null, $colnum = 0)


    /**
     * Execute the specified query, fetch the value from the first column of
     * each row of the result set into an array and then frees the result set.
     *
     * @param string $query  the SELECT query statement to be executed.
     * @param string $type   optional argument that specifies the expected
     * datatype of the result set field, so that an eventual
     * conversion may be performed. The default datatype is text,
     * meaning that no conversion is performed
     * @param mixed  $colnum the column number (or name) to fetch
     *
     * @return  mixed   MDB2_OK or data array on success, a MDB2 error on failure
     * @access  public
     */
    function queryCol($query, $type = null, $colnum = 0)
    {
        $result = $this->query($query, $type);
        if (! MDB2 :: isResultCommon($result))
        {
            return $result;
        }

        $col = $result->fetchCol($colnum);
        $result->free();
        return $col;
    }

    // }}}
    // {{{ function queryAll($query, $types = null, $fetchmode = MDB2_FETCHMODE_DEFAULT, $rekey = false, $force_array = false, $group = false)


    /**
     * Execute the specified query, fetch all the rows of the result set into
     * a two dimensional array and then frees the result set.
     *
     * @param   string  the SELECT query statement to be executed.
     * @param   array   optional array argument that specifies a list of
     * expected datatypes of the result set columns, so that the eventual
     * conversions may be performed. The default list of datatypes is
     * empty, meaning that no conversion is performed.
     * @param   int     how the array data should be indexed
     * @param   bool    if set to true, the $all will have the first
     * column as its first dimension
     * @param   bool    used only when the query returns exactly
     * two columns. If true, the values of the returned array will be
     * one-element arrays instead of scalars.
     * @param   bool    if true, the values of the returned array is
     * wrapped in another array.  If the same key value (in the first
     * column) repeats itself, the values will be appended to this array
     * instead of overwriting the existing values.
     *
     * @return  mixed   MDB2_OK or data array on success, a MDB2 error on failure
     *
     * @access  public
     */
    function queryAll($query, $types = null, $fetchmode = MDB2_FETCHMODE_DEFAULT, $rekey = false, $force_array = false, $group = false)
    {
        $result = $this->query($query, $types);
        if (! MDB2 :: isResultCommon($result))
        {
            return $result;
        }

        $all = $result->fetchAll($fetchmode, $rekey, $force_array, $group);
        $result->free();
        return $all;
    }

    // }}}
}

// }}}
// {{{ class MDB2_Result


/**
 * The dummy class that all user space result classes should extend from
 *
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Result
{
}

// }}}
// {{{ class MDB2_Result_Common extends MDB2_Result


/**
 * The common result class for MDB2 result objects
 *
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Result_Common extends MDB2_Result
{
    // {{{ Variables (Properties)


    var $db;
    var $result;
    var $rownum = - 1;
    var $types = array();
    var $types_assoc = array();
    var $values = array();
    var $offset;
    var $offset_count = 0;
    var $limit;
    var $column_names;

    // }}}
    // {{{ constructor: function __construct(&$db, &$result, $limit = 0, $offset = 0)


    /**
     * Constructor
     */
    function __construct(&$db, &$result, $limit = 0, $offset = 0)
    {
        $this->db = & $db;
        $this->result = & $result;
        $this->offset = $offset;
        $this->limit = max(0, $limit - 1);
    }

    // }}}
    // {{{ function __construct(&$db, &$result, $limit = 0, $offset = 0)


    /**
     * PHP 4 Constructor
     */
    //    function __construct(&$db, &$result, $limit = 0, $offset = 0)
    //    {
    //        $this->__construct($db, $result, $limit, $offset);
    //    }


    // }}}
    // {{{ function setResultTypes($types)


    /**
     * Define the list of types to be associated with the columns of a given
     * result set.
     *
     * This function may be called before invoking fetchRow(), fetchOne(),
     * fetchCol() and fetchAll() so that the necessary data type
     * conversions are performed on the data to be retrieved by them. If this
     * function is not called, the type of all result set columns is assumed
     * to be text, thus leading to not perform any conversions.
     *
     * @param   array   variable that lists the
     * data types to be expected in the result set columns. If this array
     * contains less types than the number of columns that are returned
     * in the result set, the remaining columns are assumed to be of the
     * type text. Currently, the types clob and blob are not fully
     * supported.
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function setResultTypes($types)
    {
        $load = $this->db->loadModule('Datatype', null, true);
        if (PEAR :: isError($load))
        {
            return $load;
        }
        $types = $this->db->datatype->checkResultTypes($types);
        if (PEAR :: isError($types))
        {
            return $types;
        }
        $this->types = $types;
        return MDB2_OK;
    }

    // {{{ function setResultTypesAssoc($types)


    /**
     * Define the list of types to be associated with the columns of a given
     * result set, when retrieved as an associative array.
     *
     * This function may be called before invoking fetchRow(), fetchOne(),
     * fetchCol() and fetchAll() so that the necessary data type
     * conversions are performed on the data to be retrieved by them. If this
     * function is not called, the type of all result set columns is assumed
     * to be text, thus leading to not perform any conversions.
     *
     * @param   array   variable that lists the
     * data types to be expected in the result set columns. If this array
     * contains less types than the number of columns that are returned
     * in the result set, the remaining columns are assumed to be of the
     * type text. Currently, the types clob and blob are not fully
     * supported.
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function setResultTypesAssoc($types)
    {
        $load = $this->db->loadModule('Datatype', null, true);
        if (PEAR :: isError($load))
        {
            return $load;
        }
        $types = $this->db->datatype->checkResultTypes($types);
        if (PEAR :: isError($types))
        {
            return $types;
        }
        $this->types_assoc = $types;
        return MDB2_OK;
    }

    // }}}
    // {{{ function seek($rownum = 0)


    /**
     * Seek to a specific row in a result set
     *
     * @param   int     number of the row where the data can be found
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function seek($rownum = 0)
    {
        $target_rownum = $rownum - 1;
        if ($this->rownum > $target_rownum)
        {
            return $this->db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'seeking to previous rows not implemented', __FUNCTION__);
        }
        while ($this->rownum < $target_rownum)
        {
            $this->fetchRow();
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function &fetchRow($fetchmode = MDB2_FETCHMODE_DEFAULT, $rownum = null)


    /**
     * Fetch and return a row of data
     *
     * @param   int     how the array data should be indexed
     * @param   int     number of the row where the data can be found
     *
     * @return  int     data array on success, a MDB2 error on failure
     *
     * @access  public
     */
    function &fetchRow($fetchmode = MDB2_FETCHMODE_DEFAULT, $rownum = null)
    {
        $err = & $this->db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
        return $err;
    }

    // }}}
    // {{{ function fetchOne($colnum = 0)


    /**
     * fetch single column from the next row from a result set
     *
     * @param int|string the column number (or name) to fetch
     * @param int        number of the row where the data can be found
     *
     * @return string data on success, a MDB2 error on failure
     * @access  public
     */
    function fetchOne($colnum = 0, $rownum = null)
    {
        $fetchmode = is_numeric($colnum) ? MDB2_FETCHMODE_ORDERED : MDB2_FETCHMODE_ASSOC;
        $row = $this->fetchRow($fetchmode, $rownum);
        if (! is_array($row) || PEAR :: isError($row))
        {
            return $row;
        }
        if (! array_key_exists($colnum, $row))
        {
            return $this->db->raiseError(MDB2_ERROR_TRUNCATED, null, null, 'column is not defined in the result set: ' . $colnum, __FUNCTION__);
        }
        return $row[$colnum];
    }

    // }}}
    // {{{ function fetchCol($colnum = 0)


    /**
     * Fetch and return a column from the current row pointer position
     *
     * @param int|string the column number (or name) to fetch
     *
     * @return  mixed data array on success, a MDB2 error on failure
     * @access  public
     */
    function fetchCol($colnum = 0)
    {
        $column = array();
        $fetchmode = is_numeric($colnum) ? MDB2_FETCHMODE_ORDERED : MDB2_FETCHMODE_ASSOC;
        $row = $this->fetchRow($fetchmode);
        if (is_array($row))
        {
            if (! array_key_exists($colnum, $row))
            {
                return $this->db->raiseError(MDB2_ERROR_TRUNCATED, null, null, 'column is not defined in the result set: ' . $colnum, __FUNCTION__);
            }
            do
            {
                $column[] = $row[$colnum];
            }
            while (is_array($row = $this->fetchRow($fetchmode)));
        }
        if (PEAR :: isError($row))
        {
            return $row;
        }
        return $column;
    }

    // }}}
    // {{{ function fetchAll($fetchmode = MDB2_FETCHMODE_DEFAULT, $rekey = false, $force_array = false, $group = false)


    /**
     * Fetch and return all rows from the current row pointer position
     *
     * @param   int     $fetchmode  the fetch mode to use:
     * + MDB2_FETCHMODE_ORDERED
     * + MDB2_FETCHMODE_ASSOC
     * + MDB2_FETCHMODE_ORDERED | MDB2_FETCHMODE_FLIPPED
     * + MDB2_FETCHMODE_ASSOC | MDB2_FETCHMODE_FLIPPED
     * @param   bool    if set to true, the $all will have the first
     * column as its first dimension
     * @param   bool    used only when the query returns exactly
     * two columns. If true, the values of the returned array will be
     * one-element arrays instead of scalars.
     * @param   bool    if true, the values of the returned array is
     * wrapped in another array.  If the same key value (in the first
     * column) repeats itself, the values will be appended to this array
     * instead of overwriting the existing values.
     *
     * @return  mixed   data array on success, a MDB2 error on failure
     *
     * @access  public
     * @see     getAssoc()
     */
    function fetchAll($fetchmode = MDB2_FETCHMODE_DEFAULT, $rekey = false, $force_array = false, $group = false)
    {
        $all = array();
        $row = $this->fetchRow($fetchmode);
        if (PEAR :: isError($row))
        {
            return $row;
        }
        elseif (! $row)
        {
            return $all;
        }

        $shift_array = $rekey ? false : null;
        if (! is_null($shift_array))
        {
            if (is_object($row))
            {
                $colnum = count(get_object_vars($row));
            }
            else
            {
                $colnum = count($row);
            }
            if ($colnum < 2)
            {
                return $this->db->raiseError(MDB2_ERROR_TRUNCATED, null, null, 'rekey feature requires atleast 2 column', __FUNCTION__);
            }
            $shift_array = (! $force_array && $colnum == 2);
        }

        if ($rekey)
        {
            do
            {
                if (is_object($row))
                {
                    $arr = get_object_vars($row);
                    $key = reset($arr);
                    unset($row->{$key});
                }
                else
                {
                    if ($fetchmode & MDB2_FETCHMODE_ASSOC)
                    {
                        $key = reset($row);
                        unset($row[key($row)]);
                    }
                    else
                    {
                        $key = array_shift($row);
                    }
                    if ($shift_array)
                    {
                        $row = array_shift($row);
                    }
                }
                if ($group)
                {
                    $all[$key][] = $row;
                }
                else
                {
                    $all[$key] = $row;
                }
            }
            while (($row = $this->fetchRow($fetchmode)));
        }
        elseif ($fetchmode & MDB2_FETCHMODE_FLIPPED)
        {
            do
            {
                foreach ($row as $key => $val)
                {
                    $all[$key][] = $val;
                }
            }
            while (($row = $this->fetchRow($fetchmode)));
        }
        else
        {
            do
            {
                $all[] = $row;
            }
            while (($row = $this->fetchRow($fetchmode)));
        }

        return $all;
    }

    // }}}
    // {{{ function rowCount()
    /**
     * Returns the actual row number that was last fetched (count from 0)
     * @return  int
     *
     * @access  public
     */
    function rowCount()
    {
        return $this->rownum + 1;
    }

    // }}}
    // {{{ function numRows()


    /**
     * Returns the number of rows in a result object
     *
     * @return  mixed   MDB2 Error Object or the number of rows
     *
     * @access  public
     */
    function numRows()
    {
        return $this->db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function nextResult()


    /**
     * Move the internal result pointer to the next available result
     *
     * @return  true on success, false if there is no more result set or an error object on failure
     *
     * @access  public
     */
    function nextResult()
    {
        return $this->db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function getColumnNames()


    /**
     * Retrieve the names of columns returned by the DBMS in a query result or
     * from the cache.
     *
     * @param   bool    If set to true the values are the column names,
     * otherwise the names of the columns are the keys.
     * @return  mixed   Array variable that holds the names of columns or an
     * MDB2 error on failure.
     * Some DBMS may not return any columns when the result set
     * does not contain any rows.
     *
     * @access  public
     */
    function getColumnNames($flip = false)
    {
        if (! isset($this->column_names))
        {
            $result = $this->_getColumnNames();
            if (PEAR :: isError($result))
            {
                return $result;
            }
            $this->column_names = $result;
        }
        if ($flip)
        {
            return array_flip($this->column_names);
        }
        return $this->column_names;
    }

    // }}}
    // {{{ function _getColumnNames()


    /**
     * Retrieve the names of columns returned by the DBMS in a query result.
     *
     * @return  mixed   Array variable that holds the names of columns as keys
     * or an MDB2 error on failure.
     * Some DBMS may not return any columns when the result set
     * does not contain any rows.
     *
     * @access  private
     */
    function _getColumnNames()
    {
        return $this->db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function numCols()


    /**
     * Count the number of columns returned by the DBMS in a query result.
     *
     * @return  mixed   integer value with the number of columns, a MDB2 error
     * on failure
     *
     * @access  public
     */
    function numCols()
    {
        return $this->db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null, 'method not implemented', __FUNCTION__);
    }

    // }}}
    // {{{ function getResource()


    /**
     * return the resource associated with the result object
     *
     * @return  resource
     *
     * @access  public
     */
    function getResource()
    {
        return $this->result;
    }

    // }}}
    // {{{ function bindColumn($column, &$value, $type = null)


    /**
     * Set bind variable to a column.
     *
     * @param   int     column number or name
     * @param   mixed   variable reference
     * @param   string  specifies the type of the field
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function bindColumn($column, &$value, $type = null)
    {
        if (! is_numeric($column))
        {
            $column_names = $this->getColumnNames();
            if ($this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE)
            {
                if ($this->db->options['field_case'] == CASE_LOWER)
                {
                    $column = strtolower($column);
                }
                else
                {
                    $column = strtoupper($column);
                }
            }
            $column = $column_names[$column];
        }
        $this->values[$column] = & $value;
        if (! is_null($type))
        {
            $this->types[$column] = $type;
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function _assignBindColumns($row)


    /**
     * Bind a variable to a value in the result row.
     *
     * @param   array   row data
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  private
     */
    function _assignBindColumns($row)
    {
        $row = array_values($row);
        foreach ($row as $column => $value)
        {
            if (array_key_exists($column, $this->values))
            {
                $this->values[$column] = $value;
            }
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function free()


    /**
     * Free the internal resources associated with result.
     *
     * @return  bool    true on success, false if result is invalid
     *
     * @access  public
     */
    function free()
    {
        $this->result = false;
        return MDB2_OK;
    }

    // }}}
}

// }}}
// {{{ class MDB2_Row


/**
 * The simple class that accepts row data as an array
 *
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Row
{

    // {{{ constructor: function __construct(&$row)


    /**
     * constructor
     *
     * @param   resource    row data as array
     */
    function __construct(&$row)
    {
        foreach ($row as $key => $value)
        {
            $this->$key = &$row[$key];
        }
    }

    // }}}
// {{{ function __construct(&$row)


/**
 * PHP 4 Constructor
 *
 * @param   resource    row data as array
 */
//    function __construct(&$row)
//    {
//        $this->__construct($row);
//    }


// }}}
}

// }}}
// {{{ class MDB2_Statement_Common


/**
 * The common statement class for MDB2 statement objects
 *
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Statement_Common
{
    // {{{ Variables (Properties)


    var $db;
    var $statement;
    var $query;
    var $result_types;
    var $types;
    var $values = array();
    var $limit;
    var $offset;
    var $is_manip;

    // }}}
    // {{{ constructor: function __construct(&$db, &$statement, $positions, $query, $types, $result_types, $is_manip = false, $limit = null, $offset = null)


    /**
     * Constructor
     */
    function __construct(&$db, &$statement, $positions, $query, $types, $result_types, $is_manip = false, $limit = null, $offset = null)
    {
        $this->db = & $db;
        $this->statement = & $statement;
        $this->positions = $positions;
        $this->query = $query;
        $this->types = (array) $types;
        $this->result_types = (array) $result_types;
        $this->limit = $limit;
        $this->is_manip = $is_manip;
        $this->offset = $offset;
    }

    // }}}
    // {{{ function __construct(&$db, &$statement, $positions, $query, $types, $result_types, $is_manip = false, $limit = null, $offset = null)


    /**
     * PHP 4 Constructor
     */
    //    function __construct(&$db, &$statement, $positions, $query, $types, $result_types, $is_manip = false, $limit = null, $offset = null)
    //    {
    //        $this->__construct($db, $statement, $positions, $query, $types, $result_types, $is_manip, $limit, $offset);
    //    }


    // }}}
    // {{{ function bindValue($parameter, &$value, $type = null)


    /**
     * Set the value of a parameter of a prepared query.
     *
     * @param   int     the order number of the parameter in the query
     * statement. The order number of the first parameter is 1.
     * @param   mixed   value that is meant to be assigned to specified
     * parameter. The type of the value depends on the $type argument.
     * @param   string  specifies the type of the field
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function bindValue($parameter, $value, $type = null)
    {
        if (! is_numeric($parameter))
        {
            $parameter = preg_replace('/^:(.*)$/', '\\1', $parameter);
        }
        if (! in_array($parameter, $this->positions))
        {
            return $this->db->raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'Unable to bind to missing placeholder: ' . $parameter, __FUNCTION__);
        }
        $this->values[$parameter] = $value;
        if (! is_null($type))
        {
            $this->types[$parameter] = $type;
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function bindValueArray($values, $types = null)


    /**
     * Set the values of multiple a parameter of a prepared query in bulk.
     *
     * @param   array   specifies all necessary information
     * for bindValue() the array elements must use keys corresponding to
     * the number of the position of the parameter.
     * @param   array   specifies the types of the fields
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     * @see     bindParam()
     */
    function bindValueArray($values, $types = null)
    {
        $types = is_array($types) ? array_values($types) : array_fill(0, count($values), null);
        $parameters = array_keys($values);
        foreach ($parameters as $key => $parameter)
        {
            $this->db->pushErrorHandling(PEAR_ERROR_RETURN);
            $this->db->expectError(MDB2_ERROR_NOT_FOUND);
            $err = $this->bindValue($parameter, $values[$parameter], $types[$key]);
            $this->db->popExpect();
            $this->db->popErrorHandling();
            if (PEAR :: isError($err))
            {
                if ($err->getCode() == MDB2_ERROR_NOT_FOUND)
                {
                    //ignore (extra value for missing placeholder)
                    continue;
                }
                return $err;
            }
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function bindParam($parameter, &$value, $type = null)


    /**
     * Bind a variable to a parameter of a prepared query.
     *
     * @param   int     the order number of the parameter in the query
     * statement. The order number of the first parameter is 1.
     * @param   mixed   variable that is meant to be bound to specified
     * parameter. The type of the value depends on the $type argument.
     * @param   string  specifies the type of the field
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function bindParam($parameter, &$value, $type = null)
    {
        if (! is_numeric($parameter))
        {
            $parameter = preg_replace('/^:(.*)$/', '\\1', $parameter);
        }
        if (! in_array($parameter, $this->positions))
        {
            return $this->db->raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'Unable to bind to missing placeholder: ' . $parameter, __FUNCTION__);
        }
        $this->values[$parameter] = & $value;
        if (! is_null($type))
        {
            $this->types[$parameter] = $type;
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function bindParamArray(&$values, $types = null)


    /**
     * Bind the variables of multiple a parameter of a prepared query in bulk.
     *
     * @param   array   specifies all necessary information
     * for bindParam() the array elements must use keys corresponding to
     * the number of the position of the parameter.
     * @param   array   specifies the types of the fields
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     * @see     bindParam()
     */
    function bindParamArray(&$values, $types = null)
    {
        $types = is_array($types) ? array_values($types) : array_fill(0, count($values), null);
        $parameters = array_keys($values);
        foreach ($parameters as $key => $parameter)
        {
            $err = $this->bindParam($parameter, $values[$parameter], $types[$key]);
            if (PEAR :: isError($err))
            {
                return $err;
            }
        }
        return MDB2_OK;
    }

    // }}}
    // {{{ function &execute($values = null, $result_class = true, $result_wrap_class = false)


    /**
     * Execute a prepared query statement.
     *
     * @param array specifies all necessary information
     * for bindParam() the array elements must use keys corresponding
     * to the number of the position of the parameter.
     * @param mixed specifies which result class to use
     * @param mixed specifies which class to wrap results in
     *
     * @return mixed MDB2_Result or integer (affected rows) on success,
     * a MDB2 error on failure
     * @access public
     */
    function &execute($values = null, $result_class = true, $result_wrap_class = false)
    {
        if (is_null($this->positions))
        {
            return $this->db->raiseError(MDB2_ERROR, null, null, 'Prepared statement has already been freed', __FUNCTION__);
        }

        $values = (array) $values;
        if (! empty($values))
        {
            $err = $this->bindValueArray($values);
            if (PEAR :: isError($err))
            {
                return $this->db->raiseError(MDB2_ERROR, null, null, 'Binding Values failed with message: ' . $err->getMessage(), __FUNCTION__);
            }
        }
        $result = & $this->_execute($result_class, $result_wrap_class);
        return $result;
    }

    // }}}
    // {{{ function &_execute($result_class = true, $result_wrap_class = false)


    /**
     * Execute a prepared query statement helper method.
     *
     * @param   mixed   specifies which result class to use
     * @param   mixed   specifies which class to wrap results in
     *
     * @return mixed MDB2_Result or integer (affected rows) on success,
     * a MDB2 error on failure
     * @access  private
     */
    function &_execute($result_class = true, $result_wrap_class = false)
    {
        $this->last_query = $this->query;
        $query = '';
        $last_position = 0;
        foreach ($this->positions as $current_position => $parameter)
        {
            if (! array_key_exists($parameter, $this->values))
            {
                return $this->db->raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'Unable to bind to missing placeholder: ' . $parameter, __FUNCTION__);
            }
            $value = $this->values[$parameter];
            $query .= substr($this->query, $last_position, $current_position - $last_position);
            if (! isset($value))
            {
                $value_quoted = 'NULL';
            }
            else
            {
                $type = ! empty($this->types[$parameter]) ? $this->types[$parameter] : null;
                $value_quoted = $this->db->quote($value, $type);
                if (PEAR :: isError($value_quoted))
                {
                    return $value_quoted;
                }
            }
            $query .= $value_quoted;
            $last_position = $current_position + 1;
        }
        $query .= substr($this->query, $last_position);

        $this->db->offset = $this->offset;
        $this->db->limit = $this->limit;
        if ($this->is_manip)
        {
            $result = $this->db->exec($query);
        }
        else
        {
            $result = & $this->db->query($query, $this->result_types, $result_class, $result_wrap_class);
        }
        return $result;
    }

    // }}}
    // {{{ function free()


    /**
     * Release resources allocated for the specified prepared query.
     *
     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
     *
     * @access  public
     */
    function free()
    {
        if (is_null($this->positions))
        {
            return $this->db->raiseError(MDB2_ERROR, null, null, 'Prepared statement has already been freed', __FUNCTION__);
        }

        $this->statement = null;
        $this->positions = null;
        $this->query = null;
        $this->types = null;
        $this->result_types = null;
        $this->limit = null;
        $this->is_manip = null;
        $this->offset = null;
        $this->values = null;

        return MDB2_OK;
    }

    // }}}
}

// }}}
// {{{ class MDB2_Module_Common


/**
 * The common modules class for MDB2 module objects
 *
 * @package     MDB2
 * @category    Database
 * @author      Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Module_Common
{
    // {{{ Variables (Properties)


    /**
     * contains the key to the global MDB2 instance array of the associated
     * MDB2 instance
     *
     * @var     int
     * @access  protected
     */
    var $db_index;

    // }}}
    // {{{ constructor: function __construct($db_index)


    /**
     * Constructor
     */
    function __construct($db_index)
    {
        $this->db_index = $db_index;
    }

    // }}}
    // {{{ function __construct($db_index)


    /**
     * PHP 4 Constructor
     */
    //    function __construct($db_index)
    //    {
    //        $this->__construct($db_index);
    //    }


    // }}}
    // {{{ function &getDBInstance()


    /**
     * Get the instance of MDB2 associated with the module instance
     *
     * @return  object  MDB2 instance or a MDB2 error on failure
     *
     * @access  public
     */
    function &getDBInstance()
    {
        if (isset($GLOBALS['_MDB2_databases'][$this->db_index]))
        {
            $result = & $GLOBALS['_MDB2_databases'][$this->db_index];
        }
        else
        {
            $result = & MDB2 :: raiseError(MDB2_ERROR_NOT_FOUND, null, null, 'could not find MDB2 instance');
        }
        return $result;
    }

    // }}}
}

// }}}
// {{{ function MDB2_closeOpenTransactions()


/**
 * Close any open transactions form persistent connections
 *
 * @return  void
 *
 * @access  public
 */

function MDB2_closeOpenTransactions()
{
    reset($GLOBALS['_MDB2_databases']);
    while (next($GLOBALS['_MDB2_databases']))
    {
        $key = key($GLOBALS['_MDB2_databases']);
        if ($GLOBALS['_MDB2_databases'][$key]->opened_persistent && $GLOBALS['_MDB2_databases'][$key]->in_transaction)
        {
            $GLOBALS['_MDB2_databases'][$key]->rollback();
        }
    }
}

// }}}
// {{{ function MDB2_defaultDebugOutput(&$db, $scope, $message, $is_manip = null)


/**
 * default debug output handler
 *
 * @param   object  reference to an MDB2 database object
 * @param   string  usually the method name that triggered the debug call:
 * for example 'query', 'prepare', 'execute', 'parameters',
 * 'beginTransaction', 'commit', 'rollback'
 * @param   string  message that should be appended to the debug variable
 * @param   array   contains context information about the debug() call
 * common keys are: is_manip, time, result etc.
 *
 * @return  void|string optionally return a modified message, this allows
 * rewriting a query before being issued or prepared
 *
 * @access  public
 */
function MDB2_defaultDebugOutput(&$db, $scope, $message, $context = array())
{
    $db->debug_output .= $scope . '(' . $db->db_index . '): ';
    $db->debug_output .= $message . $db->getOption('log_line_break');
    return $message;
}

// }}}
?>
Back to Top