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/trunk/src/sqlite/test/eval.test

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Possible License(s): BSD-3-Clause
 1# 2008 July 11
 2#
 3# The author disclaims copyright to this source code.  In place of
 4# a legal notice, here is a blessing:
 5#
 6#    May you do good and not evil.
 7#    May you find forgiveness for yourself and forgive others.
 8#    May you share freely, never taking more than you give.
 9#
10#***********************************************************************
11# This file implements regression tests for SQLite library.
12#
13# This file experiments with recursion using the "test_eval()" SQL function
14# in order to make sure that SQLite is reentrant.
15#
16# $Id: eval.test,v 1.2 2008/10/13 10:37:50 danielk1977 Exp $
17
18set testdir [file dirname $argv0]
19source $testdir/tester.tcl
20
21# Create a table to work with.
22#
23do_test eval-1.1 {
24  execsql {
25    CREATE TABLE t1(x INTEGER PRIMARY KEY); 
26    INSERT INTO t1 VALUES(1);
27    INSERT INTO t1 VALUES(2);
28    INSERT INTO t1 SELECT x+2 FROM t1;
29    INSERT INTO t1 SELECT x+4 FROM t1;
30    INSERT INTO t1 SELECT x+8 FROM t1;
31    INSERT INTO t1 SELECT x+16 FROM t1;
32    INSERT INTO t1 SELECT x+32 FROM t1;
33    INSERT INTO t1 SELECT x+64 FROM t1;
34    INSERT INTO t1 SELECT x+128 FROM t1;
35    INSERT INTO t1 SELECT x+256 FROM t1;
36    SELECT count(*), max(x) FROM t1;
37  }
38} {512 512}
39do_test eval-1.2 {
40  execsql {
41    SELECT x, test_eval('SELECT max(x) FROM t1 WHERE x<' || x) FROM t1 LIMIT 5
42  }
43} {1 {} 2 1 3 2 4 3 5 4}
44
45# Delete a row out from under a read cursor in the middle of
46# collecting the arguments for a single row in a result set.
47# Verify that subsequent rows come out as NULL.
48#
49do_test eval-2.1 {
50  execsql {
51    CREATE TABLE t2(x,y);
52    INSERT INTO t2 SELECT x, x+1 FROM t1 WHERE x<5;
53    SELECT x, test_eval('DELETE FROM t2 WHERE x='||x), y FROM t2;
54  }
55} {1 {} {} 2 {} {} 3 {} {} 4 {} {}}
56do_test eval-2.2 {
57  execsql {
58    SELECT * FROM t2
59  }
60} {}
61
62# Modify a row while it is being read.
63#
64do_test eval-3.1 {
65  execsql {
66    INSERT INTO t2 SELECT x, x+1 FROM t1 WHERE x<5;
67    SELECT x, test_eval('UPDATE t2 SET y=y+100 WHERE x='||x), y FROM t2;
68  }
69} {1 {} 102 2 {} 103 3 {} 104 4 {} 105}
70
71do_test eval-4.1 {
72  execsql { SELECT test_eval('SELECT "abcdefghij"') }
73} {abcdefghij}
74
75finish_test