1# 2007 Dec 12
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#
12# This file contains test cases for stressing database
13# changes that involve side effects that delete rows from
14# the table being changed.  Ticket #2832 shows that in
15# older versions of SQLite that behavior was implemented
16# incorrectly and resulted in corrupt database files.
17#
18# $Id: sidedelete.test,v 1.2 2008/08/04 03:51:24 danielk1977 Exp $
19#
20
21set testdir [file dirname $argv0]
22source $testdir/tester.tcl
23
24# The sequence table is created to store a sequence of integers
25# starting with 1.  This is used to reinitialize other tables
26# as part of other tests.
27#
28do_test sidedelete-1.1 {
29  execsql {
30    CREATE TABLE sequence(a INTEGER PRIMARY KEY);
31    INSERT INTO sequence VALUES(1);
32    INSERT INTO sequence VALUES(2);
33  }
34  for {set i 0} {$i<8} {incr i} {
35    execsql {
36      INSERT INTO sequence SELECT a+(SELECT max(a) FROM sequence) FROM sequence;
37    }
38  }
39  execsql {SELECT count(*) FROM sequence}
40} {512}
41
42# Make a series of changes using an UPDATE OR REPLACE and a
43# correlated subquery.  This would cause database corruption
44# prior to the fix for ticket #2832.
45#
46do_test sidedelete-2.0 {
47  execsql {
48    CREATE TABLE t1(a PRIMARY KEY, b);
49    CREATE TABLE chng(a PRIMARY KEY, b);
50    SELECT count(*) FROM t1;
51    SELECT count(*) FROM chng;
52  }
53} {0 0}
54for {set i 2} {$i<=100} {incr i} {
55  set n [expr {($i+2)/2}]
56  do_test sidedelete-2.$i.1 {
57    execsql {
58      DELETE FROM t1;
59      INSERT INTO t1 SELECT a, a FROM sequence WHERE a<=$i;
60      DELETE FROM chng;
61      INSERT INTO chng SELECT a*2, a*2+1 FROM sequence WHERE a<=$i/2;
62      UPDATE OR REPLACE t1 SET a=(SELECT b FROM chng WHERE a=t1.a);
63      SELECT count(*), sum(a) FROM t1;
64    }
65  } [list $n [expr {$n*$n-1}]]
66  integrity_check sidedelete-2.$i.2
67}
68
69# This will cause stacks leaks but not database corruption prior
70# to the #2832 fix.
71#
72do_test sidedelete-3.0 {
73  execsql {
74     DROP TABLE t1;
75     CREATE TABLE t1(a PRIMARY KEY);
76     SELECT * FROM t1;
77  }
78} {}
79for {set i 1} {$i<=100} {incr i} {
80  set n [expr {($i+1)/2}]
81  do_test sidedelete-3.$i.1 {
82    execsql {
83      DELETE FROM t1;
84      INSERT INTO t1 SELECT a FROM sequence WHERE a<=$i;
85      UPDATE OR REPLACE t1 SET a=a+1;
86      SELECT count(*), sum(a) FROM t1;
87    }
88  } [list $n [expr {$n*($n+1)}]]
89  integrity_check sidedelete-3.$i.2
90}
91
92finish_test
93