# 2007 Dec 12 # # The author disclaims copyright to this source code. In place of # a legal notice, here is a blessing: # # May you do good and not evil. # May you find forgiveness for yourself and forgive others. # May you share freely, never taking more than you give. # #*********************************************************************** # # This file contains test cases for stressing database # changes that involve side effects that delete rows from # the table being changed. Ticket #2832 shows that in # older versions of SQLite that behavior was implemented # incorrectly and resulted in corrupt database files. # # $Id: sidedelete.test,v 1.1.1.1 2012/02/21 17:04:16 misho Exp $ # set testdir [file dirname $argv0] source $testdir/tester.tcl # The sequence table is created to store a sequence of integers # starting with 1. This is used to reinitialize other tables # as part of other tests. # do_test sidedelete-1.1 { execsql { CREATE TABLE sequence(a INTEGER PRIMARY KEY); INSERT INTO sequence VALUES(1); INSERT INTO sequence VALUES(2); } for {set i 0} {$i<8} {incr i} { execsql { INSERT INTO sequence SELECT a+(SELECT max(a) FROM sequence) FROM sequence; } } execsql {SELECT count(*) FROM sequence} } {512} # Make a series of changes using an UPDATE OR REPLACE and a # correlated subquery. This would cause database corruption # prior to the fix for ticket #2832. # do_test sidedelete-2.0 { execsql { CREATE TABLE t1(a PRIMARY KEY, b); CREATE TABLE chng(a PRIMARY KEY, b); SELECT count(*) FROM t1; SELECT count(*) FROM chng; } } {0 0} for {set i 2} {$i<=100} {incr i} { set n [expr {($i+2)/2}] do_test sidedelete-2.$i.1 { execsql { DELETE FROM t1; INSERT INTO t1 SELECT a, a FROM sequence WHERE a<=$i; DELETE FROM chng; INSERT INTO chng SELECT a*2, a*2+1 FROM sequence WHERE a<=$i/2; UPDATE OR REPLACE t1 SET a=(SELECT b FROM chng WHERE a=t1.a); SELECT count(*), sum(a) FROM t1; } } [list $n [expr {$n*$n-1}]] integrity_check sidedelete-2.$i.2 } # This will cause stacks leaks but not database corruption prior # to the #2832 fix. # do_test sidedelete-3.0 { execsql { DROP TABLE t1; CREATE TABLE t1(a PRIMARY KEY); SELECT * FROM t1; } } {} for {set i 1} {$i<=100} {incr i} { set n [expr {($i+1)/2}] do_test sidedelete-3.$i.1 { execsql { DELETE FROM t1; INSERT INTO t1 SELECT a FROM sequence WHERE a<=$i; UPDATE OR REPLACE t1 SET a=a+1; SELECT count(*), sum(a) FROM t1; } } [list $n [expr {$n*($n+1)}]] integrity_check sidedelete-3.$i.2 } finish_test