mirror of
https://gitlab.com/cznic/sqlite.git
synced 2024-11-24 02:26:14 +00:00
120 lines
3.2 KiB
Plaintext
120 lines
3.2 KiB
Plaintext
# 2003 September 6
|
|
#
|
|
# 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. The
|
|
# focus of this script is a test to replicate the bug reported by
|
|
# ticket #842.
|
|
#
|
|
# Ticket #842 was a database corruption problem caused by a DELETE that
|
|
# removed an index entry by not the main table entry. To recreate the
|
|
# problem do this:
|
|
#
|
|
# (1) Create a table with an index. Insert some data into that table.
|
|
# (2) Start a query on the table but do not complete the query.
|
|
# (3) Try to delete a single entry from the table.
|
|
#
|
|
# Step 3 will fail because there is still a read cursor on the table.
|
|
# But the database is corrupted by the DELETE. It turns out that the
|
|
# index entry was deleted first, before the table entry. And the index
|
|
# delete worked. Thus an entry was deleted from the index but not from
|
|
# the table.
|
|
#
|
|
# The solution to the problem was to detect that the table is locked
|
|
# before the index entry is deleted.
|
|
#
|
|
# $Id: delete2.test,v 1.8 2008/07/08 15:59:52 danielk1977 Exp $
|
|
#
|
|
|
|
set testdir [file dirname $argv0]
|
|
source $testdir/tester.tcl
|
|
|
|
# Create a table that has an index.
|
|
#
|
|
do_test delete2-1.1 {
|
|
set DB [sqlite3_connection_pointer db]
|
|
execsql {
|
|
CREATE TABLE q(s string, id string, constraint pk_q primary key(id));
|
|
BEGIN;
|
|
INSERT INTO q(s,id) VALUES('hello','id.1');
|
|
INSERT INTO q(s,id) VALUES('goodbye','id.2');
|
|
INSERT INTO q(s,id) VALUES('again','id.3');
|
|
END;
|
|
SELECT * FROM q;
|
|
}
|
|
} {hello id.1 goodbye id.2 again id.3}
|
|
do_test delete2-1.2 {
|
|
execsql {
|
|
SELECT * FROM q WHERE id='id.1';
|
|
}
|
|
} {hello id.1}
|
|
integrity_check delete2-1.3
|
|
|
|
# Start a query on the table. The query should not use the index.
|
|
# Do not complete the query, thus leaving the table locked.
|
|
#
|
|
do_test delete2-1.4 {
|
|
set STMT [sqlite3_prepare $DB {SELECT * FROM q} -1 TAIL]
|
|
sqlite3_step $STMT
|
|
} SQLITE_ROW
|
|
integrity_check delete2-1.5
|
|
|
|
# Try to delete a row from the table while a read is in process.
|
|
# As of 2006-08-16, this is allowed. (It used to fail with SQLITE_LOCKED.)
|
|
#
|
|
do_test delete2-1.6 {
|
|
catchsql {
|
|
DELETE FROM q WHERE rowid=1
|
|
}
|
|
} {0 {}}
|
|
integrity_check delete2-1.7
|
|
do_test delete2-1.8 {
|
|
execsql {
|
|
SELECT * FROM q;
|
|
}
|
|
} {goodbye id.2 again id.3}
|
|
|
|
# Finalize the query, thus clearing the lock on the table. Then
|
|
# retry the delete. The delete should work this time.
|
|
#
|
|
do_test delete2-1.9 {
|
|
sqlite3_finalize $STMT
|
|
catchsql {
|
|
DELETE FROM q WHERE rowid=1
|
|
}
|
|
} {0 {}}
|
|
integrity_check delete2-1.10
|
|
do_test delete2-1.11 {
|
|
execsql {
|
|
SELECT * FROM q;
|
|
}
|
|
} {goodbye id.2 again id.3}
|
|
|
|
do_test delete2-2.1 {
|
|
execsql {
|
|
CREATE TABLE t1(a, b);
|
|
CREATE TABLE t2(c, d);
|
|
INSERT INTO t1 VALUES(1, 2);
|
|
INSERT INTO t2 VALUES(3, 4);
|
|
INSERT INTO t2 VALUES(5, 6);
|
|
}
|
|
} {}
|
|
do_test delete2-2.2 {
|
|
set res [list]
|
|
db eval {
|
|
SELECT CASE WHEN c = 5 THEN b ELSE NULL END AS b, c, d FROM t1, t2
|
|
} {
|
|
db eval {DELETE FROM t1}
|
|
lappend res $b $c $d
|
|
}
|
|
set res
|
|
} {{} 3 4 {} 5 6}
|
|
|
|
finish_test
|