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120 lines
3.2 KiB
Plaintext
120 lines
3.2 KiB
Plaintext
# 2003 September 6
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library. The
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# focus of this script is a test to replicate the bug reported by
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# ticket #842.
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#
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# Ticket #842 was a database corruption problem caused by a DELETE that
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# removed an index entry by not the main table entry. To recreate the
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# problem do this:
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#
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# (1) Create a table with an index. Insert some data into that table.
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# (2) Start a query on the table but do not complete the query.
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# (3) Try to delete a single entry from the table.
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#
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# Step 3 will fail because there is still a read cursor on the table.
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# But the database is corrupted by the DELETE. It turns out that the
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# index entry was deleted first, before the table entry. And the index
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# delete worked. Thus an entry was deleted from the index but not from
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# the table.
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#
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# The solution to the problem was to detect that the table is locked
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# before the index entry is deleted.
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#
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# $Id: delete2.test,v 1.8 2008/07/08 15:59:52 danielk1977 Exp $
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# Create a table that has an index.
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#
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do_test delete2-1.1 {
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set DB [sqlite3_connection_pointer db]
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execsql {
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CREATE TABLE q(s string, id string, constraint pk_q primary key(id));
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BEGIN;
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INSERT INTO q(s,id) VALUES('hello','id.1');
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INSERT INTO q(s,id) VALUES('goodbye','id.2');
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INSERT INTO q(s,id) VALUES('again','id.3');
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END;
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SELECT * FROM q;
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}
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} {hello id.1 goodbye id.2 again id.3}
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do_test delete2-1.2 {
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execsql {
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SELECT * FROM q WHERE id='id.1';
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}
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} {hello id.1}
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integrity_check delete2-1.3
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# Start a query on the table. The query should not use the index.
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# Do not complete the query, thus leaving the table locked.
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#
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do_test delete2-1.4 {
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set STMT [sqlite3_prepare $DB {SELECT * FROM q} -1 TAIL]
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sqlite3_step $STMT
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} SQLITE_ROW
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integrity_check delete2-1.5
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# Try to delete a row from the table while a read is in process.
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# As of 2006-08-16, this is allowed. (It used to fail with SQLITE_LOCKED.)
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#
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do_test delete2-1.6 {
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catchsql {
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DELETE FROM q WHERE rowid=1
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}
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} {0 {}}
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integrity_check delete2-1.7
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do_test delete2-1.8 {
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execsql {
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SELECT * FROM q;
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}
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} {goodbye id.2 again id.3}
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# Finalize the query, thus clearing the lock on the table. Then
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# retry the delete. The delete should work this time.
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#
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do_test delete2-1.9 {
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sqlite3_finalize $STMT
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catchsql {
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DELETE FROM q WHERE rowid=1
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}
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} {0 {}}
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integrity_check delete2-1.10
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do_test delete2-1.11 {
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execsql {
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SELECT * FROM q;
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}
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} {goodbye id.2 again id.3}
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do_test delete2-2.1 {
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execsql {
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CREATE TABLE t1(a, b);
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CREATE TABLE t2(c, d);
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INSERT INTO t1 VALUES(1, 2);
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INSERT INTO t2 VALUES(3, 4);
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INSERT INTO t2 VALUES(5, 6);
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}
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} {}
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do_test delete2-2.2 {
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set res [list]
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db eval {
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SELECT CASE WHEN c = 5 THEN b ELSE NULL END AS b, c, d FROM t1, t2
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} {
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db eval {DELETE FROM t1}
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lappend res $b $c $d
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}
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set res
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} {{} 3 4 {} 5 6}
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finish_test
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