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/j/kfm/includes/pear/MDB2/Driver/sqlite.php

http://kv-webme.googlecode.com/
PHP | 1073 lines | 1018 code | 1 blank | 54 comment | 1 complexity | 6694cba55228dc1b9890cbdf6d4e3fea MD5 | raw file
   1<?php
   2// vim: set et ts=4 sw=4 fdm=marker:
   3// +----------------------------------------------------------------------+
   4// | PHP versions 4 and 5                                                 |
   5// +----------------------------------------------------------------------+
   6// | Copyright (c) 1998-2007 Manuel Lemos, Tomas V.V.Cox,                 |
   7// | Stig. S. Bakken, Lukas Smith                                         |
   8// | All rights reserved.                                                 |
   9// +----------------------------------------------------------------------+
  10// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB  |
  11// | API as well as database abstraction for PHP applications.            |
  12// | This LICENSE is in the BSD license style.                            |
  13// |                                                                      |
  14// | Redistribution and use in source and binary forms, with or without   |
  15// | modification, are permitted provided that the following conditions   |
  16// | are met:                                                             |
  17// |                                                                      |
  18// | Redistributions of source code must retain the above copyright       |
  19// | notice, this list of conditions and the following disclaimer.        |
  20// |                                                                      |
  21// | Redistributions in binary form must reproduce the above copyright    |
  22// | notice, this list of conditions and the following disclaimer in the  |
  23// | documentation and/or other materials provided with the distribution. |
  24// |                                                                      |
  25// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken,    |
  26// | Lukas Smith nor the names of his contributors may be used to endorse |
  27// | or promote products derived from this software without specific prior|
  28// | written permission.                                                  |
  29// |                                                                      |
  30// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
  31// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    |
  32// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    |
  33// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE      |
  34// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,          |
  35// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
  36// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
  37// |  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  |
  38// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT          |
  39// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
  40// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE          |
  41// | POSSIBILITY OF SUCH DAMAGE.                                          |
  42// +----------------------------------------------------------------------+
  43// | Author: Lukas Smith <smith@pooteeweet.org>                           |
  44// +----------------------------------------------------------------------+
  45//
  46// $Id: sqlite.php,v 1.149 2007/05/02 22:00:08 quipo Exp $
  47//
  48
  49/**
  50 * MDB2 SQLite driver
  51 *
  52 * @package MDB2
  53 * @category Database
  54 * @author  Lukas Smith <smith@pooteeweet.org>
  55 */
  56class MDB2_Driver_sqlite extends MDB2_Driver_Common
  57{
  58    // {{{ properties
  59    var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => "'", 'escape_pattern' => false);
  60
  61    var $identifier_quoting = array('start' => '"', 'end' => '"', 'escape' => '"');
  62
  63    var $_lasterror = '';
  64
  65    var $fix_assoc_fields_names = false;
  66
  67    // }}}
  68    // {{{ constructor
  69
  70    /**
  71     * Constructor
  72     */
  73    function __construct()
  74    {
  75        parent::__construct();
  76
  77        $this->phptype = 'sqlite';
  78        $this->dbsyntax = 'sqlite';
  79
  80        $this->supported['sequences'] = 'emulated';
  81        $this->supported['indexes'] = true;
  82        $this->supported['affected_rows'] = true;
  83        $this->supported['summary_functions'] = true;
  84        $this->supported['order_by_text'] = true;
  85        $this->supported['current_id'] = 'emulated';
  86        $this->supported['limit_queries'] = true;
  87        $this->supported['LOBs'] = true;
  88        $this->supported['replace'] = true;
  89        $this->supported['transactions'] = true;
  90        $this->supported['savepoints'] = false;
  91        $this->supported['sub_selects'] = true;
  92        $this->supported['auto_increment'] = true;
  93        $this->supported['primary_key'] = false; // requires alter table implementation
  94        $this->supported['result_introspection'] = false; // not implemented
  95        $this->supported['prepared_statements'] = 'emulated';
  96        $this->supported['identifier_quoting'] = true;
  97        $this->supported['pattern_escaping'] = false;
  98        $this->supported['new_link'] = false;
  99
 100        $this->options['base_transaction_name'] = '___php_MDB2_sqlite_auto_commit_off';
 101        $this->options['fixed_float'] = 0;
 102        $this->options['database_path'] = '';
 103        $this->options['database_extension'] = '';
 104        $this->options['server_version'] = '';
 105    }
 106
 107    // }}}
 108    // {{{ errorInfo()
 109
 110    /**
 111     * This method is used to collect information about an error
 112     *
 113     * @param integer $error
 114     * @return array
 115     * @access public
 116     */
 117    function errorInfo($error = null)
 118    {
 119        $native_code = null;
 120        if ($this->connection) {
 121            $native_code = @sqlite_last_error($this->connection);
 122        }
 123        $native_msg = $this->_lasterror
 124            ? html_entity_decode($this->_lasterror) : @sqlite_error_string($native_code);
 125            
 126        // PHP 5.2+ prepends the function name to $php_errormsg, so we need
 127        // this hack to work around it, per bug #9599.
 128        $native_msg = preg_replace('/^sqlite[a-z_]+\(\): /', '', $native_msg);
 129
 130        if (is_null($error)) {
 131            static $error_regexps;
 132            if (empty($error_regexps)) {
 133                $error_regexps = array(
 134                    '/^no such table:/' => MDB2_ERROR_NOSUCHTABLE,
 135                    '/^no such index:/' => MDB2_ERROR_NOT_FOUND,
 136                    '/^(table|index) .* already exists$/' => MDB2_ERROR_ALREADY_EXISTS,
 137                    '/PRIMARY KEY must be unique/i' => MDB2_ERROR_CONSTRAINT,
 138                    '/is not unique/' => MDB2_ERROR_CONSTRAINT,
 139                    '/columns .* are not unique/i' => MDB2_ERROR_CONSTRAINT,
 140                    '/uniqueness constraint failed/' => MDB2_ERROR_CONSTRAINT,
 141                    '/may not be NULL/' => MDB2_ERROR_CONSTRAINT_NOT_NULL,
 142                    '/^no such column:/' => MDB2_ERROR_NOSUCHFIELD,
 143                    '/column not present in both tables/i' => MDB2_ERROR_NOSUCHFIELD,
 144                    '/^near ".*": syntax error$/' => MDB2_ERROR_SYNTAX,
 145                    '/[0-9]+ values for [0-9]+ columns/i' => MDB2_ERROR_VALUE_COUNT_ON_ROW,
 146                 );
 147            }
 148            foreach ($error_regexps as $regexp => $code) {
 149                if (preg_match($regexp, $native_msg)) {
 150                    $error = $code;
 151                    break;
 152                }
 153            }
 154        }
 155        return array($error, $native_code, $native_msg);
 156    }
 157
 158    // }}}
 159    // {{{ escape()
 160
 161    /**
 162     * Quotes a string so it can be safely used in a query. It will quote
 163     * the text so it can safely be used within a query.
 164     *
 165     * @param   string  the input string to quote
 166     * @param   bool    escape wildcards
 167     *
 168     * @return  string  quoted string
 169     *
 170     * @access  public
 171     */
 172    function escape($text, $escape_wildcards = false)
 173    {
 174        $text = @sqlite_escape_string($text);
 175        return $text;
 176    }
 177
 178    // }}}
 179    // {{{ beginTransaction()
 180
 181    /**
 182     * Start a transaction or set a savepoint.
 183     *
 184     * @param   string  name of a savepoint to set
 185     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
 186     *
 187     * @access  public
 188     */
 189    function beginTransaction($savepoint = null)
 190    {
 191        $this->debug('Starting transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
 192        if (!is_null($savepoint)) {
 193            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
 194                'savepoints are not supported', __FUNCTION__);
 195        } elseif ($this->in_transaction) {
 196            return MDB2_OK;  //nothing to do
 197        }
 198        if (!$this->destructor_registered && $this->opened_persistent) {
 199            $this->destructor_registered = true;
 200            register_shutdown_function('MDB2_closeOpenTransactions');
 201        }
 202        $query = 'BEGIN TRANSACTION '.$this->options['base_transaction_name'];
 203        $result =& $this->_doQuery($query, true);
 204        if (PEAR::isError($result)) {
 205            return $result;
 206        }
 207        $this->in_transaction = true;
 208        return MDB2_OK;
 209    }
 210
 211    // }}}
 212    // {{{ commit()
 213
 214    /**
 215     * Commit the database changes done during a transaction that is in
 216     * progress or release a savepoint. This function may only be called when
 217     * auto-committing is disabled, otherwise it will fail. Therefore, a new
 218     * transaction is implicitly started after committing the pending changes.
 219     *
 220     * @param   string  name of a savepoint to release
 221     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
 222     *
 223     * @access  public
 224     */
 225    function commit($savepoint = null)
 226    {
 227        $this->debug('Committing transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
 228        if (!$this->in_transaction) {
 229            return $this->raiseError(MDB2_ERROR_INVALID, null, null,
 230                'commit/release savepoint cannot be done changes are auto committed', __FUNCTION__);
 231        }
 232        if (!is_null($savepoint)) {
 233            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
 234                'savepoints are not supported', __FUNCTION__);
 235        }
 236
 237        $query = 'COMMIT TRANSACTION '.$this->options['base_transaction_name'];
 238        $result =& $this->_doQuery($query, true);
 239        if (PEAR::isError($result)) {
 240            return $result;
 241        }
 242        $this->in_transaction = false;
 243        return MDB2_OK;
 244    }
 245
 246    // }}}
 247    // {{{
 248
 249    /**
 250     * Cancel any database changes done during a transaction or since a specific
 251     * savepoint that is in progress. This function may only be called when
 252     * auto-committing is disabled, otherwise it will fail. Therefore, a new
 253     * transaction is implicitly started after canceling the pending changes.
 254     *
 255     * @param   string  name of a savepoint to rollback to
 256     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
 257     *
 258     * @access  public
 259     */
 260    function rollback($savepoint = null)
 261    {
 262        $this->debug('Rolling back transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));
 263        if (!$this->in_transaction) {
 264            return $this->raiseError(MDB2_ERROR_INVALID, null, null,
 265                'rollback cannot be done changes are auto committed', __FUNCTION__);
 266        }
 267        if (!is_null($savepoint)) {
 268            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
 269                'savepoints are not supported', __FUNCTION__);
 270        }
 271
 272        $query = 'ROLLBACK TRANSACTION '.$this->options['base_transaction_name'];
 273        $result =& $this->_doQuery($query, true);
 274        if (PEAR::isError($result)) {
 275            return $result;
 276        }
 277        $this->in_transaction = false;
 278        return MDB2_OK;
 279    }
 280
 281    // }}}
 282    // {{{ function setTransactionIsolation()
 283
 284    /**
 285     * Set the transacton isolation level.
 286     *
 287     * @param   string  standard isolation level
 288     *                  READ UNCOMMITTED (allows dirty reads)
 289     *                  READ COMMITTED (prevents dirty reads)
 290     *                  REPEATABLE READ (prevents nonrepeatable reads)
 291     *                  SERIALIZABLE (prevents phantom reads)
 292     * @return  mixed   MDB2_OK on success, a MDB2 error on failure
 293     *
 294     * @access  public
 295     * @since   2.1.1
 296     */
 297    function setTransactionIsolation($isolation)
 298    {
 299        $this->debug('Setting transaction isolation level', __FUNCTION__, array('is_manip' => true));
 300        switch ($isolation) {
 301        case 'READ UNCOMMITTED':
 302            $isolation = 0;
 303            break;
 304        case 'READ COMMITTED':
 305        case 'REPEATABLE READ':
 306        case 'SERIALIZABLE':
 307            $isolation = 1;
 308            break;
 309        default:
 310            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
 311                'isolation level is not supported: '.$isolation, __FUNCTION__);
 312        }
 313
 314        $query = "PRAGMA read_uncommitted=$isolation";
 315        return $this->_doQuery($query, true);
 316    }
 317
 318    // }}}
 319    // {{{ getDatabaseFile()
 320
 321    /**
 322     * Builds the string with path+dbname+extension
 323     *
 324     * @return string full database path+file
 325     * @access protected
 326     */
 327    function _getDatabaseFile($database_name)
 328    {
 329        if ($database_name === '' || $database_name === ':memory:') {
 330            return $database_name;
 331        }
 332        return $this->options['database_path'].$database_name.$this->options['database_extension'];
 333    }
 334
 335    // }}}
 336    // {{{ connect()
 337
 338    /**
 339     * Connect to the database
 340     *
 341     * @return true on success, MDB2 Error Object on failure
 342     **/
 343    function connect()
 344    {
 345        $database_file = $this->_getDatabaseFile($this->database_name);
 346        if (is_resource($this->connection)) {
 347            if (count(array_diff($this->connected_dsn, $this->dsn)) == 0
 348                && $this->connected_database_name == $database_file
 349                && $this->opened_persistent == $this->options['persistent']
 350            ) {
 351                return MDB2_OK;
 352            }
 353            $this->disconnect(false);
 354        }
 355
 356        if (!PEAR::loadExtension($this->phptype)) {
 357            return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
 358                'extension '.$this->phptype.' is not compiled into PHP', __FUNCTION__);
 359        }
 360
 361        if (!empty($this->database_name)) {
 362            if ($database_file !== ':memory:') {
 363                if (!file_exists($database_file)) {
 364                    if (!touch($database_file)) {
 365                        return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
 366                            'Could not create database file', __FUNCTION__);
 367                    }
 368                    if (!isset($this->dsn['mode'])
 369                        || !is_numeric($this->dsn['mode'])
 370                    ) {
 371                        $mode = 0644;
 372                    } else {
 373                        $mode = octdec($this->dsn['mode']);
 374                    }
 375                    if (!chmod($database_file, $mode)) {
 376                        return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
 377                            'Could not be chmodded database file', __FUNCTION__);
 378                    }
 379                    if (!file_exists($database_file)) {
 380                        return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
 381                            'Could not be found database file', __FUNCTION__);
 382                    }
 383                }
 384                if (!is_file($database_file)) {
 385                    return $this->raiseError(MDB2_ERROR_INVALID, null, null,
 386                            'Database is a directory name', __FUNCTION__);
 387                }
 388                if (!is_readable($database_file)) {
 389                    return $this->raiseError(MDB2_ERROR_ACCESS_VIOLATION, null, null,
 390                            'Could not read database file', __FUNCTION__);
 391                }
 392            }
 393
 394            $connect_function = ($this->options['persistent'] ? 'sqlite_popen' : 'sqlite_open');
 395            $php_errormsg = '';
 396            if (version_compare('5.1.0', PHP_VERSION, '>')) {
 397                @ini_set('track_errors', true);
 398                $connection = @$connect_function($database_file);
 399                @ini_restore('track_errors');
 400            } else {
 401                $connection = @$connect_function($database_file, 0666, $php_errormsg);
 402            }
 403            $this->_lasterror = $php_errormsg;
 404            if (!$connection) {
 405                return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,
 406                'unable to establish a connection', __FUNCTION__);
 407            }
 408
 409            if (!empty($this->dsn['charset'])) {
 410                $result = $this->setCharset($this->dsn['charset'], $connection);
 411                if (PEAR::isError($result)) {
 412                    return $result;
 413                }
 414            }
 415
 416            $this->connection = $connection;
 417            $this->connected_dsn = $this->dsn;
 418            $this->connected_database_name = $database_file;
 419            $this->opened_persistent = $this->getoption('persistent');
 420            $this->dbsyntax = $this->dsn['dbsyntax'] ? $this->dsn['dbsyntax'] : $this->phptype;
 421        }
 422        return MDB2_OK;
 423    }
 424
 425    // }}}
 426    // {{{ disconnect()
 427
 428    /**
 429     * Log out and disconnect from the database.
 430     *
 431     * @param  boolean $force if the disconnect should be forced even if the
 432     *                        connection is opened persistently
 433     * @return mixed true on success, false if not connected and error
 434     *                object on error
 435     * @access public
 436     */
 437    function disconnect($force = true)
 438    {
 439        if (is_resource($this->connection)) {
 440            if ($this->in_transaction) {
 441                $dsn = $this->dsn;
 442                $database_name = $this->database_name;
 443                $persistent = $this->options['persistent'];
 444                $this->dsn = $this->connected_dsn;
 445                $this->database_name = $this->connected_database_name;
 446                $this->options['persistent'] = $this->opened_persistent;
 447                $this->rollback();
 448                $this->dsn = $dsn;
 449                $this->database_name = $database_name;
 450                $this->options['persistent'] = $persistent;
 451            }
 452
 453            if (!$this->opened_persistent || $force) {
 454                @sqlite_close($this->connection);
 455            }
 456        }
 457        return parent::disconnect($force);
 458    }
 459
 460    // }}}
 461    // {{{ getConnection()
 462
 463    /**
 464     * Returns a native connection
 465     *
 466     * @return  mixed   a valid MDB2 connection object,
 467     *                  or a MDB2 error object on error
 468     * @access  public
 469     */
 470    function getConnection()
 471    {
 472        $connection = parent::getConnection();
 473        if (PEAR::isError($connection)) {
 474            return $connection;
 475        }
 476
 477        $fix_assoc_fields_names = $this->options['portability'] & MDB2_PORTABILITY_FIX_ASSOC_FIELD_NAMES;
 478        if ($fix_assoc_fields_names !== $this->fix_assoc_fields_names) {
 479            @sqlite_query("PRAGMA short_column_names = $fix_assoc_fields_names;", $connection);
 480            $this->fix_assoc_fields_names = $fix_assoc_fields_names;
 481        }
 482
 483        return $connection;
 484    }
 485
 486    // }}}
 487    // {{{ _doQuery()
 488
 489    /**
 490     * Execute a query
 491     * @param string $query  query
 492     * @param boolean $is_manip  if the query is a manipulation query
 493     * @param resource $connection
 494     * @param string $database_name
 495     * @return result or error object
 496     * @access protected
 497     */
 498    function &_doQuery($query, $is_manip = false, $connection = null, $database_name = null)
 499    {
 500        $this->last_query = $query;
 501        $result = $this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'pre'));
 502        if ($result) {
 503            if (PEAR::isError($result)) {
 504                return $result;
 505            }
 506            $query = $result;
 507        }
 508        if ($this->options['disable_query']) {
 509            $result = $is_manip ? 0 : null;
 510            return $result;
 511        }
 512
 513        if (is_null($connection)) {
 514            $connection = $this->getConnection();
 515            if (PEAR::isError($connection)) {
 516                return $connection;
 517            }
 518        }
 519
 520        $function = $this->options['result_buffering']
 521            ? 'sqlite_query' : 'sqlite_unbuffered_query';
 522        $php_errormsg = '';
 523        if (version_compare('5.1.0', PHP_VERSION, '>')) {
 524            @ini_set('track_errors', true);
 525            do {
 526                $result = @$function($query.';', $connection);
 527            } while (sqlite_last_error($connection) == SQLITE_SCHEMA);
 528            @ini_restore('track_errors');
 529        } else {
 530            do {
 531                $result = @$function($query.';', $connection, SQLITE_BOTH, $php_errormsg);
 532            } while (sqlite_last_error($connection) == SQLITE_SCHEMA);
 533        }
 534        $this->_lasterror = $php_errormsg;
 535
 536        if (!$result) {
 537            $err =& $this->raiseError(null, null, null,
 538                'Could not execute statement', __FUNCTION__);
 539            return $err;
 540        }
 541
 542        $this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'post', 'result' => $result));
 543        return $result;
 544    }
 545
 546    // }}}
 547    // {{{ _affectedRows()
 548
 549    /**
 550     * Returns the number of rows affected
 551     *
 552     * @param resource $result
 553     * @param resource $connection
 554     * @return mixed MDB2 Error Object or the number of rows affected
 555     * @access private
 556     */
 557    function _affectedRows($connection, $result = null)
 558    {
 559        if (is_null($connection)) {
 560            $connection = $this->getConnection();
 561            if (PEAR::isError($connection)) {
 562                return $connection;
 563            }
 564        }
 565        return @sqlite_changes($connection);
 566    }
 567
 568    // }}}
 569    // {{{ _modifyQuery()
 570
 571    /**
 572     * Changes a query string for various DBMS specific reasons
 573     *
 574     * @param string $query  query to modify
 575     * @param boolean $is_manip  if it is a DML query
 576     * @param integer $limit  limit the number of rows
 577     * @param integer $offset  start reading from given offset
 578     * @return string modified query
 579     * @access protected
 580     */
 581    function _modifyQuery($query, $is_manip, $limit, $offset)
 582    {
 583        if ($this->options['portability'] & MDB2_PORTABILITY_DELETE_COUNT) {
 584            if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $query)) {
 585                $query = preg_replace('/^\s*DELETE\s+FROM\s+(\S+)\s*$/',
 586                                      'DELETE FROM \1 WHERE 1=1', $query);
 587            }
 588        }
 589        if ($limit > 0
 590            && !preg_match('/LIMIT\s*\d(?:\s*(?:,|OFFSET)\s*\d+)?(?:[^\)]*)?$/i', $query)
 591        ) {
 592            $query = rtrim($query);
 593            if (substr($query, -1) == ';') {
 594                $query = substr($query, 0, -1);
 595            }
 596            if ($is_manip) {
 597                $query.= " LIMIT $limit";
 598            } else {
 599                $query.= " LIMIT $offset,$limit";
 600            }
 601        }
 602        return $query;
 603    }
 604
 605    // }}}
 606    // {{{ getServerVersion()
 607
 608    /**
 609     * return version information about the server
 610     *
 611     * @param bool   $native  determines if the raw version string should be returned
 612     * @return mixed array/string with version information or MDB2 error object
 613     * @access public
 614     */
 615    function getServerVersion($native = false)
 616    {
 617        $server_info = false;
 618        if ($this->connected_server_info) {
 619            $server_info = $this->connected_server_info;
 620        } elseif ($this->options['server_version']) {
 621            $server_info = $this->options['server_version'];
 622        } elseif (function_exists('sqlite_libversion')) {
 623            $server_info = @sqlite_libversion();
 624        }
 625        if (!$server_info) {
 626            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
 627                'Requires either the "server_version" option or the sqlite_libversion() function', __FUNCTION__);
 628        }
 629        // cache server_info
 630        $this->connected_server_info = $server_info;
 631        if (!$native) {
 632            $tmp = explode('.', $server_info, 3);
 633            $server_info = array(
 634                'major' => isset($tmp[0]) ? $tmp[0] : null,
 635                'minor' => isset($tmp[1]) ? $tmp[1] : null,
 636                'patch' => isset($tmp[2]) ? $tmp[2] : null,
 637                'extra' => null,
 638                'native' => $server_info,
 639            );
 640        }
 641        return $server_info;
 642    }
 643
 644    // }}}
 645    // {{{ replace()
 646
 647    /**
 648     * Execute a SQL REPLACE query. A REPLACE query is identical to a INSERT
 649     * query, except that if there is already a row in the table with the same
 650     * key field values, the REPLACE query just updates its values instead of
 651     * inserting a new row.
 652     *
 653     * The REPLACE type of query does not make part of the SQL standards. Since
 654     * practically only SQLite implements it natively, this type of query is
 655     * emulated through this method for other DBMS using standard types of
 656     * queries inside a transaction to assure the atomicity of the operation.
 657     *
 658     * @access public
 659     *
 660     * @param string $table name of the table on which the REPLACE query will
 661     *  be executed.
 662     * @param array $fields associative array that describes the fields and the
 663     *  values that will be inserted or updated in the specified table. The
 664     *  indexes of the array are the names of all the fields of the table. The
 665     *  values of the array are also associative arrays that describe the
 666     *  values and other properties of the table fields.
 667     *
 668     *  Here follows a list of field properties that need to be specified:
 669     *
 670     *    value:
 671     *          Value to be assigned to the specified field. This value may be
 672     *          of specified in database independent type format as this
 673     *          function can perform the necessary datatype conversions.
 674     *
 675     *    Default:
 676     *          this property is required unless the Null property
 677     *          is set to 1.
 678     *
 679     *    type
 680     *          Name of the type of the field. Currently, all types Metabase
 681     *          are supported except for clob and blob.
 682     *
 683     *    Default: no type conversion
 684     *
 685     *    null
 686     *          Boolean property that indicates that the value for this field
 687     *          should be set to null.
 688     *
 689     *          The default value for fields missing in INSERT queries may be
 690     *          specified the definition of a table. Often, the default value
 691     *          is already null, but since the REPLACE may be emulated using
 692     *          an UPDATE query, make sure that all fields of the table are
 693     *          listed in this function argument array.
 694     *
 695     *    Default: 0
 696     *
 697     *    key
 698     *          Boolean property that indicates that this field should be
 699     *          handled as a primary key or at least as part of the compound
 700     *          unique index of the table that will determine the row that will
 701     *          updated if it exists or inserted a new row otherwise.
 702     *
 703     *          This function will fail if no key field is specified or if the
 704     *          value of a key field is set to null because fields that are
 705     *          part of unique index they may not be null.
 706     *
 707     *    Default: 0
 708     *
 709     * @return mixed MDB2_OK on success, a MDB2 error on failure
 710     */
 711    function replace($table, $fields)
 712    {
 713        $count = count($fields);
 714        $query = $values = '';
 715        $keys = $colnum = 0;
 716        for (reset($fields); $colnum < $count; next($fields), $colnum++) {
 717            $name = key($fields);
 718            if ($colnum > 0) {
 719                $query .= ',';
 720                $values.= ',';
 721            }
 722            $query.= $name;
 723            if (isset($fields[$name]['null']) && $fields[$name]['null']) {
 724                $value = 'NULL';
 725            } else {
 726                $type = isset($fields[$name]['type']) ? $fields[$name]['type'] : null;
 727                $value = $this->quote($fields[$name]['value'], $type);
 728            }
 729            $values.= $value;
 730            if (isset($fields[$name]['key']) && $fields[$name]['key']) {
 731                if ($value === 'NULL') {
 732                    return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null,
 733                        'key value '.$name.' may not be NULL', __FUNCTION__);
 734                }
 735                $keys++;
 736            }
 737        }
 738        if ($keys == 0) {
 739            return $this->raiseError(MDB2_ERROR_CANNOT_REPLACE, null, null,
 740                'not specified which fields are keys', __FUNCTION__);
 741        }
 742
 743        $connection = $this->getConnection();
 744        if (PEAR::isError($connection)) {
 745            return $connection;
 746        }
 747
 748        $query = "REPLACE INTO $table ($query) VALUES ($values)";
 749        $result =& $this->_doQuery($query, true, $connection);
 750        if (PEAR::isError($result)) {
 751            return $result;
 752        }
 753        return $this->_affectedRows($connection, $result);
 754    }
 755
 756    // }}}
 757    // {{{ nextID()
 758
 759    /**
 760     * Returns the next free id of a sequence
 761     *
 762     * @param string $seq_name name of the sequence
 763     * @param boolean $ondemand when true the sequence is
 764     *                          automatic created, if it
 765     *                          not exists
 766     *
 767     * @return mixed MDB2 Error Object or id
 768     * @access public
 769     */
 770    function nextID($seq_name, $ondemand = true)
 771    {
 772        $sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
 773        $seqcol_name = $this->options['seqcol_name'];
 774        $query = "INSERT INTO $sequence_name ($seqcol_name) VALUES (NULL)";
 775        $this->expectError(MDB2_ERROR_NOSUCHTABLE);
 776        $result =& $this->_doQuery($query, true);
 777        $this->popExpect();
 778        if (PEAR::isError($result)) {
 779            if ($ondemand && $result->getCode() == MDB2_ERROR_NOSUCHTABLE) {
 780                $this->loadModule('Manager', null, true);
 781                $result = $this->manager->createSequence($seq_name);
 782                if (PEAR::isError($result)) {
 783                    return $this->raiseError($result, null, null,
 784                        'on demand sequence '.$seq_name.' could not be created', __FUNCTION__);
 785                } else {
 786                    return $this->nextID($seq_name, false);
 787                }
 788            }
 789            return $result;
 790        }
 791        $value = $this->lastInsertID();
 792        if (is_numeric($value)) {
 793            $query = "DELETE FROM $sequence_name WHERE $seqcol_name < $value";
 794            $result =& $this->_doQuery($query, true);
 795            if (PEAR::isError($result)) {
 796                $this->warnings[] = 'nextID: could not delete previous sequence table values from '.$seq_name;
 797            }
 798        }
 799        return $value;
 800    }
 801
 802    // }}}
 803    // {{{ lastInsertID()
 804
 805    /**
 806     * Returns the autoincrement ID if supported or $id or fetches the current
 807     * ID in a sequence called: $table.(empty($field) ? '' : '_'.$field)
 808     *
 809     * @param string $table name of the table into which a new row was inserted
 810     * @param string $field name of the field into which a new row was inserted
 811     * @return mixed MDB2 Error Object or id
 812     * @access public
 813     */
 814    function lastInsertID($table = null, $field = null)
 815    {
 816        $connection = $this->getConnection();
 817        if (PEAR::isError($connection)) {
 818            return $connection;
 819        }
 820        $value = @sqlite_last_insert_rowid($connection);
 821        if (!$value) {
 822            return $this->raiseError(null, null, null,
 823                'Could not get last insert ID', __FUNCTION__);
 824        }
 825        return $value;
 826    }
 827
 828    // }}}
 829    // {{{ currID()
 830
 831    /**
 832     * Returns the current id of a sequence
 833     *
 834     * @param string $seq_name name of the sequence
 835     * @return mixed MDB2 Error Object or id
 836     * @access public
 837     */
 838    function currID($seq_name)
 839    {
 840        $sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);
 841        $seqcol_name = $this->quoteIdentifier($this->options['seqcol_name'], true);
 842        $query = "SELECT MAX($seqcol_name) FROM $sequence_name";
 843        return $this->queryOne($query, 'integer');
 844    }
 845}
 846
 847/**
 848 * MDB2 SQLite result driver
 849 *
 850 * @package MDB2
 851 * @category Database
 852 * @author  Lukas Smith <smith@pooteeweet.org>
 853 */
 854class MDB2_Result_sqlite extends MDB2_Result_Common
 855{
 856    // }}}
 857    // {{{ fetchRow()
 858
 859    /**
 860     * Fetch a row and insert the data into an existing array.
 861     *
 862     * @param int       $fetchmode  how the array data should be indexed
 863     * @param int    $rownum    number of the row where the data can be found
 864     * @return int data array on success, a MDB2 error on failure
 865     * @access public
 866     */
 867    function &fetchRow($fetchmode = MDB2_FETCHMODE_DEFAULT, $rownum = null)
 868    {
 869        if (!is_null($rownum)) {
 870            $seek = $this->seek($rownum);
 871            if (PEAR::isError($seek)) {
 872                return $seek;
 873            }
 874        }
 875        if ($fetchmode == MDB2_FETCHMODE_DEFAULT) {
 876            $fetchmode = $this->db->fetchmode;
 877        }
 878        if ($fetchmode & MDB2_FETCHMODE_ASSOC) {
 879            $row = @sqlite_fetch_array($this->result, SQLITE_ASSOC);
 880            if (is_array($row)
 881                && $this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE
 882            ) {
 883                $row = array_change_key_case($row, $this->db->options['field_case']);
 884            }
 885        } else {
 886           $row = @sqlite_fetch_array($this->result, SQLITE_NUM);
 887        }
 888        if (!$row) {
 889            if ($this->result === false) {
 890                $err =& $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
 891                    'resultset has already been freed', __FUNCTION__);
 892                return $err;
 893            }
 894            $null = null;
 895            return $null;
 896        }
 897        $mode = $this->db->options['portability'] & MDB2_PORTABILITY_EMPTY_TO_NULL;
 898        $rtrim = false;
 899        if ($this->db->options['portability'] & MDB2_PORTABILITY_RTRIM) {
 900            if (empty($this->types)) {
 901                $mode += MDB2_PORTABILITY_RTRIM;
 902            } else {
 903                $rtrim = true;
 904            }
 905        }
 906        if ($mode) {
 907            $this->db->_fixResultArrayValues($row, $mode);
 908        }
 909        if (!empty($this->types)) {
 910            $row = $this->db->datatype->convertResultRow($this->types, $row, $rtrim);
 911        }
 912        if (!empty($this->values)) {
 913            $this->_assignBindColumns($row);
 914        }
 915        if ($fetchmode === MDB2_FETCHMODE_OBJECT) {
 916            $object_class = $this->db->options['fetch_class'];
 917            if ($object_class == 'stdClass') {
 918                $row = (object) $row;
 919            } else {
 920                $row = &new $object_class($row);
 921            }
 922        }
 923        ++$this->rownum;
 924        return $row;
 925    }
 926
 927    // }}}
 928    // {{{ _getColumnNames()
 929
 930    /**
 931     * Retrieve the names of columns returned by the DBMS in a query result.
 932     *
 933     * @return  mixed   Array variable that holds the names of columns as keys
 934     *                  or an MDB2 error on failure.
 935     *                  Some DBMS may not return any columns when the result set
 936     *                  does not contain any rows.
 937     * @access private
 938     */
 939    function _getColumnNames()
 940    {
 941        $columns = array();
 942        $numcols = $this->numCols();
 943        if (PEAR::isError($numcols)) {
 944            return $numcols;
 945        }
 946        for ($column = 0; $column < $numcols; $column++) {
 947            $column_name = @sqlite_field_name($this->result, $column);
 948            $columns[$column_name] = $column;
 949        }
 950        if ($this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
 951            $columns = array_change_key_case($columns, $this->db->options['field_case']);
 952        }
 953        return $columns;
 954    }
 955
 956    // }}}
 957    // {{{ numCols()
 958
 959    /**
 960     * Count the number of columns returned by the DBMS in a query result.
 961     *
 962     * @access public
 963     * @return mixed integer value with the number of columns, a MDB2 error
 964     *                       on failure
 965     */
 966    function numCols()
 967    {
 968        $cols = @sqlite_num_fields($this->result);
 969        if (is_null($cols)) {
 970            if ($this->result === false) {
 971                return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
 972                    'resultset has already been freed', __FUNCTION__);
 973            } elseif (is_null($this->result)) {
 974                return count($this->types);
 975            }
 976            return $this->db->raiseError(null, null, null,
 977                'Could not get column count', __FUNCTION__);
 978        }
 979        return $cols;
 980    }
 981}
 982
 983/**
 984 * MDB2 SQLite buffered result driver
 985 *
 986 * @package MDB2
 987 * @category Database
 988 * @author  Lukas Smith <smith@pooteeweet.org>
 989 */
 990class MDB2_BufferedResult_sqlite extends MDB2_Result_sqlite
 991{
 992    // {{{ seek()
 993
 994    /**
 995     * Seek to a specific row in a result set
 996     *
 997     * @param int    $rownum    number of the row where the data can be found
 998     * @return mixed MDB2_OK on success, a MDB2 error on failure
 999     * @access public
1000     */
1001    function seek($rownum = 0)
1002    {
1003        if (!@sqlite_seek($this->result, $rownum)) {
1004            if ($this->result === false) {
1005                return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
1006                    'resultset has already been freed', __FUNCTION__);
1007            } elseif (is_null($this->result)) {
1008                return MDB2_OK;
1009            }
1010            return $this->db->raiseError(MDB2_ERROR_INVALID, null, null,
1011                'tried to seek to an invalid row number ('.$rownum.')', __FUNCTION__);
1012        }
1013        $this->rownum = $rownum - 1;
1014        return MDB2_OK;
1015    }
1016
1017    // }}}
1018    // {{{ valid()
1019
1020    /**
1021     * Check if the end of the result set has been reached
1022     *
1023     * @return mixed true or false on sucess, a MDB2 error on failure
1024     * @access public
1025     */
1026    function valid()
1027    {
1028        $numrows = $this->numRows();
1029        if (PEAR::isError($numrows)) {
1030            return $numrows;
1031        }
1032        return $this->rownum < ($numrows - 1);
1033    }
1034
1035    // }}}
1036    // {{{ numRows()
1037
1038    /**
1039     * Returns the number of rows in a result object
1040     *
1041     * @return mixed MDB2 Error Object or the number of rows
1042     * @access public
1043     */
1044    function numRows()
1045    {
1046        $rows = @sqlite_num_rows($this->result);
1047        if (is_null($rows)) {
1048            if ($this->result === false) {
1049                return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
1050                    'resultset has already been freed', __FUNCTION__);
1051            } elseif (is_null($this->result)) {
1052                return 0;
1053            }
1054            return $this->db->raiseError(null, null, null,
1055                'Could not get row count', __FUNCTION__);
1056        }
1057        return $rows;
1058    }
1059}
1060
1061/**
1062 * MDB2 SQLite statement driver
1063 *
1064 * @package MDB2
1065 * @category Database
1066 * @author  Lukas Smith <smith@pooteeweet.org>
1067 */
1068class MDB2_Statement_sqlite extends MDB2_Statement_Common
1069{
1070
1071}
1072
1073?>