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# 2007 June 13
#
# 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 implements regression tests for SQLite library.
#
# This file implements tests to verify that ticket #2409 has been
# fixed. More specifically, they verify that if SQLite cannot
# obtain an EXCLUSIVE lock while trying to spill the cache during
# any statement other than a COMMIT, an I/O error is returned instead
# of SQLITE_BUSY.
#
# $Id: tkt2409.test,v 1.6 2008/08/28 17:46:19 drh Exp $
# Test Outline:
#
# tkt-2409-1.*: Cause a cache-spill during an INSERT that is within
# a db transaction but does not start a statement transaction.
# Verify that the transaction is automatically rolled back
# and SQLITE_IOERR_BLOCKED is returned
#
# UPDATE: As of the pcache modifications, failing to upgrade to
# an exclusive lock when attempting a cache-spill is no longer an
# error. The pcache module allocates more space and keeps working
# in memory if this occurs.
#
# tkt-2409-2.*: Cause a cache-spill while updating the change-counter
# during a database COMMIT. Verify that the transaction is not
# rolled back and SQLITE_BUSY is returned.
#
# tkt-2409-3.*: Similar to 2409-1.*, but using many INSERT statements
# within a transaction instead of just one.
#
# UPDATE: Again, pcache now just keeps working in main memory.
#
# tkt-2409-4.*: Similar to 2409-1.*, but rig it so that the
# INSERT statement starts a statement transaction. Verify that
# SQLITE_BUSY is returned and the transaction is not rolled back.
#
# UPDATE: This time, SQLITE_BUSY is not returned. pcache just uses
# more malloc()'d memory.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !pager_pragmas {
finish_test
return
}
sqlite3_extended_result_codes $::DB 1
# Aquire a read-lock on the database using handle [db2].
#
proc read_lock_db {} {
if {$::STMT eq ""} {
set ::STMT [sqlite3_prepare db2 {SELECT rowid FROM sqlite_master} -1 TAIL]
set rc [sqlite3_step $::STMT]
if {$rc eq "SQLITE_ERROR"} {
unread_lock_db
read_lock_db
}
}
}
# Release any read-lock obtained using [read_lock_db]
#
proc unread_lock_db {} {
if {$::STMT ne ""} {
sqlite3_finalize $::STMT
set ::STMT ""
}
}
# Open the db handle used by [read_lock_db].
#
sqlite3 db2 test.db
set ::STMT ""
do_test tkt2409-1.1 {
execsql {
PRAGMA cache_size=10;
CREATE TABLE t1(x TEXT UNIQUE NOT NULL, y BLOB);
}
read_lock_db
set ::zShort [string repeat 0123456789 1]
set ::zLong [string repeat 0123456789 1500]
catchsql {
BEGIN;
INSERT INTO t1 VALUES($::zShort, $::zLong);
}
} {0 {}}
do_test tkt2409-1.2 {
sqlite3_errcode $::DB
} {SQLITE_OK}
# Check the integrity of the cache.
#
integrity_check tkt2409-1.3
# Check that the transaction was rolled back. Because the INSERT
# statement in which the "I/O error" occurred did not open a statement
# transaction, SQLite had no choice but to roll back the transaction.
#
do_test tkt2409-1.4 {
unread_lock_db
catchsql { ROLLBACK }
} {0 {}}
set ::zShort [string repeat 0123456789 1]
set ::zLong [string repeat 0123456789 1500]
set ::rc 1
for {set iCache 10} {$::rc} {incr iCache} {
execsql "PRAGMA cache_size = $iCache"
do_test tkt2409-2.1.$iCache {
read_lock_db
set ::rc [catch {
execsql {
BEGIN;
INSERT INTO t1 VALUES($::zShort, $::zLong);
}
} msg]
expr {($::rc == 1 && $msg eq "disk I/O error") || $::rc == 0}
} {1}
}
do_test tkt2409-2.2 {
catchsql {
ROLLBACK;
BEGIN;
INSERT INTO t1 VALUES($::zShort, $::zLong);
COMMIT;
}
} {1 {database is locked}}
do_test tkt2409-2.3 {
unread_lock_db
catchsql {
COMMIT;
}
} {0 {}}
do_test tkt2409-3.1 {
db close
set ::DB [sqlite3 db test.db; sqlite3_connection_pointer db]
sqlite3_extended_result_codes $::DB 1
execsql {
PRAGMA cache_size=10;
DELETE FROM t1;
}
read_lock_db
set ::zShort [string repeat 0123456789 1]
set ::zLong [string repeat 0123456789 1500]
catchsql {
BEGIN;
INSERT INTO t1 SELECT $::zShort, $::zLong;
}
} {0 {}}
do_test tkt2409-3.2 {
sqlite3_errcode $::DB
} {SQLITE_OK}
# Check the integrity of the cache.
#
integrity_check tkt2409-3.3
# Check that the transaction was rolled back. Because the INSERT
# statement in which the "I/O error" occurred did not open a statement
# transaction, SQLite had no choice but to roll back the transaction.
#
do_test tkt2409-3.4 {
unread_lock_db
catchsql { ROLLBACK }
} {0 {}}
integrity_check tkt2409-3.5
expr {srand(1)}
do_test tkt2409-4.1 {
execsql {
PRAGMA cache_size=20;
DROP TABLE t1;
CREATE TABLE t1 (x TEXT UNIQUE NOT NULL);
}
unset -nocomplain t1
array unset t1
set t1(0) 1
set sql ""
for {set i 0} {$i<5000} {incr i} {
set r 0
while {[info exists t1($r)]} {
set r [expr {int(rand()*1000000000)}]
}
set t1($r) 1
append sql "INSERT INTO t1 VALUES('some-text-$r');"
}
read_lock_db
execsql BEGIN
catchsql $sql
} {0 {}}
do_test tkt2409-4.2 {
sqlite3_errcode $::DB
} {SQLITE_OK}
# Check the integrity of the cache.
#
integrity_check tkt2409-4.3
do_test tkt2409-4.4 {
catchsql { ROLLBACK }
} {0 {}}
integrity_check tkt2409-4.5
unread_lock_db
db2 close
unset -nocomplain t1
finish_test
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