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439 lines
10 KiB
Plaintext
439 lines
10 KiB
Plaintext
# 2015 December 7
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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 focus
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# of this file is the sqlite3_snapshot_xxx() APIs.
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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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ifcapable !snapshot {finish_test; return}
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set testprefix snapshot
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# This test does not work with the inmemory_journal permutation. The reason
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# is that each connection opened as part of this permutation executes
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# "PRAGMA journal_mode=memory", which fails if the database is in wal mode
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# and there are one or more existing connections.
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if {[permutation]=="inmemory_journal"} {
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finish_test
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return
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}
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#-------------------------------------------------------------------------
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# Check some error conditions in snapshot_get(). It is an error if:
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#
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# 1) snapshot_get() is called on a non-WAL database, or
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# 2) there is an open write transaction on the database.
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#
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do_execsql_test 1.0 {
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CREATE TABLE t1(a, b);
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INSERT INTO t1 VALUES(1, 2);
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INSERT INTO t1 VALUES(3, 4);
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}
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do_test 1.1.1 {
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execsql { BEGIN; SELECT * FROM t1; }
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list [catch { sqlite3_snapshot_get db main } msg] $msg
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} {1 SQLITE_ERROR}
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do_execsql_test 1.1.2 COMMIT
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do_test 1.2.1 {
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execsql {
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PRAGMA journal_mode = WAL;
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BEGIN;
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INSERT INTO t1 VALUES(5, 6);
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INSERT INTO t1 VALUES(7, 8);
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}
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list [catch { sqlite3_snapshot_get db main } msg] $msg
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} {1 SQLITE_ERROR}
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do_execsql_test 1.3.2 COMMIT
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#-------------------------------------------------------------------------
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# Check that a simple case works. Reuse the database created by the
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# block of tests above.
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#
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do_execsql_test 2.1.0 {
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BEGIN;
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SELECT * FROM t1;
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} {1 2 3 4 5 6 7 8}
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do_test 2.1.1 {
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set snapshot [sqlite3_snapshot_get db main]
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execsql {
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COMMIT;
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INSERT INTO t1 VALUES(9, 10);
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SELECT * FROM t1;
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}
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} {1 2 3 4 5 6 7 8 9 10}
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do_test 2.1.2 {
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execsql BEGIN
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sqlite3_snapshot_open db main $snapshot
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execsql {
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SELECT * FROM t1;
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}
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} {1 2 3 4 5 6 7 8}
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do_test 2.1.3 {
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sqlite3_snapshot_free $snapshot
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execsql COMMIT
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} {}
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do_test 2.2.0 {
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sqlite3 db2 test.db
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execsql {
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BEGIN;
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SELECT * FROM t1;
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} db2
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} {1 2 3 4 5 6 7 8 9 10}
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do_test 2.2.1 {
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set snapshot [sqlite3_snapshot_get db2 main]
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execsql {
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INSERT INTO t1 VALUES(11, 12);
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SELECT * FROM t1;
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}
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} {1 2 3 4 5 6 7 8 9 10 11 12}
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do_test 2.2.2 {
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execsql BEGIN
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sqlite3_snapshot_open db main $snapshot
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execsql {
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SELECT * FROM t1;
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}
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} {1 2 3 4 5 6 7 8 9 10}
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do_test 2.2.3 {
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sqlite3_snapshot_free $snapshot
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execsql COMMIT
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execsql COMMIT db2
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db2 close
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} {}
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do_test 2.3.1 {
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execsql { DELETE FROM t1 WHERE a>6 }
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set snapshot [sqlite3_snapshot_get db main]
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execsql {
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INSERT INTO t1 VALUES('a', 'b');
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INSERT INTO t1 VALUES('c', 'd');
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SELECT * FROM t1;
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}
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} {1 2 3 4 5 6 a b c d}
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do_test 2.3.2 {
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execsql BEGIN
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sqlite3_snapshot_open db main $snapshot
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execsql { SELECT * FROM t1 }
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} {1 2 3 4 5 6}
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do_test 2.3.3 {
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catchsql {
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INSERT INTO t1 VALUES('x','y')
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}
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} {1 {database is locked}}
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do_test 2.3.4 {
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execsql COMMIT
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sqlite3_snapshot_free $snapshot
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} {}
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#-------------------------------------------------------------------------
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# Check some errors in sqlite3_snapshot_open(). It is an error if:
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#
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# 1) the db is in auto-commit mode,
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# 2) the db has an open (read or write) transaction,
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# 3) the db is not a wal database,
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#
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# Reuse the database created by earlier tests.
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#
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do_execsql_test 3.0.0 {
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CREATE TABLE t2(x, y);
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INSERT INTO t2 VALUES('a', 'b');
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INSERT INTO t2 VALUES('c', 'd');
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BEGIN;
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SELECT * FROM t2;
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} {a b c d}
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do_test 3.0.1 {
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set snapshot [sqlite3_snapshot_get db main]
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execsql { COMMIT }
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execsql { INSERT INTO t2 VALUES('e', 'f'); }
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} {}
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do_test 3.1 {
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list [catch {sqlite3_snapshot_open db main $snapshot } msg] $msg
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} {1 SQLITE_ERROR}
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do_test 3.2.1 {
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execsql {
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BEGIN;
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SELECT * FROM t2;
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}
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} {a b c d e f}
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do_test 3.2.2 {
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list [catch {sqlite3_snapshot_open db main $snapshot } msg] $msg
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} {1 SQLITE_ERROR}
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do_test 3.2.3 {
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execsql {
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COMMIT;
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BEGIN;
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INSERT INTO t2 VALUES('g', 'h');
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}
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list [catch {sqlite3_snapshot_open db main $snapshot } msg] $msg
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} {1 SQLITE_ERROR}
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do_execsql_test 3.2.4 COMMIT
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do_test 3.3.1 {
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execsql { PRAGMA journal_mode = DELETE }
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execsql { BEGIN }
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list [catch {sqlite3_snapshot_open db main $snapshot } msg] $msg
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} {1 SQLITE_ERROR}
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do_test 3.3.2 {
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sqlite3_snapshot_free $snapshot
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execsql COMMIT
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} {}
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#-------------------------------------------------------------------------
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# Check that SQLITE_BUSY_SNAPSHOT is returned if the specified snapshot
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# no longer exists because the wal file has been checkpointed.
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#
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# 1. Reading a snapshot from the middle of a wal file is not possible
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# after the wal file has been checkpointed.
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#
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# 2. That a snapshot from the end of a wal file can not be read once
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# the wal file has been wrapped.
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#
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do_execsql_test 4.1.0 {
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PRAGMA journal_mode = wal;
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CREATE TABLE t3(i, j);
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INSERT INTO t3 VALUES('o', 't');
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INSERT INTO t3 VALUES('t', 'f');
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BEGIN;
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SELECT * FROM t3;
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} {wal o t t f}
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do_test 4.1.1 {
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set snapshot [sqlite3_snapshot_get db main]
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execsql COMMIT
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} {}
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do_test 4.1.2 {
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execsql {
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INSERT INTO t3 VALUES('f', 's');
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BEGIN;
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}
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sqlite3_snapshot_open db main $snapshot
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execsql { SELECT * FROM t3 }
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} {o t t f}
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do_test 4.1.3 {
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execsql {
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COMMIT;
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PRAGMA wal_checkpoint;
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BEGIN;
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}
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list [catch {sqlite3_snapshot_open db main $snapshot} msg] $msg
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} {1 SQLITE_BUSY_SNAPSHOT}
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do_test 4.1.4 {
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sqlite3_snapshot_free $snapshot
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execsql COMMIT
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} {}
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do_test 4.2.1 {
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execsql {
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INSERT INTO t3 VALUES('s', 'e');
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INSERT INTO t3 VALUES('n', 't');
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BEGIN;
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SELECT * FROM t3;
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}
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} {o t t f f s s e n t}
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do_test 4.2.2 {
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set snapshot [sqlite3_snapshot_get db main]
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execsql {
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COMMIT;
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PRAGMA wal_checkpoint;
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BEGIN;
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}
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sqlite3_snapshot_open db main $snapshot
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execsql { SELECT * FROM t3 }
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} {o t t f f s s e n t}
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do_test 4.2.3 {
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execsql {
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COMMIT;
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INSERT INTO t3 VALUES('e', 't');
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BEGIN;
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}
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list [catch {sqlite3_snapshot_open db main $snapshot} msg] $msg
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} {1 SQLITE_BUSY_SNAPSHOT}
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do_test 4.2.4 {
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sqlite3_snapshot_free $snapshot
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} {}
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#-------------------------------------------------------------------------
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# Check that SQLITE_BUSY is returned if a checkpoint is running when
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# sqlite3_snapshot_open() is called.
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#
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reset_db
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db close
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testvfs tvfs
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sqlite3 db test.db -vfs tvfs
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do_execsql_test 5.1 {
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PRAGMA journal_mode = wal;
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CREATE TABLE x1(x, xx, xxx);
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INSERT INTO x1 VALUES('z', 'zz', 'zzz');
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BEGIN;
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SELECT * FROM x1;
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} {wal z zz zzz}
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do_test 5.2 {
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set ::snapshot [sqlite3_snapshot_get db main]
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sqlite3 db2 test.db -vfs tvfs
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execsql {
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INSERT INTO x1 VALUES('a', 'aa', 'aaa');
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COMMIT;
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}
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} {}
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set t53 0
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proc write_callback {args} {
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do_test 5.3.[incr ::t53] {
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execsql BEGIN
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list [catch { sqlite3_snapshot_open db main $::snapshot } msg] $msg
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} {1 SQLITE_BUSY}
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catchsql COMMIT
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}
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tvfs filter xWrite
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tvfs script write_callback
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db2 eval { PRAGMA wal_checkpoint }
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db close
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db2 close
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tvfs delete
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sqlite3_snapshot_free $snapshot
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#-------------------------------------------------------------------------
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# Test that sqlite3_snapshot_get() may be called immediately after
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# "BEGIN; PRAGMA user_version;". And that sqlite3_snapshot_open() may
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# be called after opening the db handle and running the script
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# "PRAGMA user_version; BEGIN".
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reset_db
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do_execsql_test 6.1 {
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PRAGMA journal_mode = wal;
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CREATE TABLE x1(x, xx, xxx);
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INSERT INTO x1 VALUES('z', 'zz', 'zzz');
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BEGIN;
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PRAGMA user_version;
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} {wal 0}
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do_test 6.2 {
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set ::snapshot [sqlite3_snapshot_get db main]
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execsql {
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INSERT INTO x1 VALUES('a', 'aa', 'aaa');
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COMMIT;
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}
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} {}
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do_test 6.3 {
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sqlite3 db2 test.db
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db2 eval "PRAGMA user_version ; BEGIN"
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sqlite3_snapshot_open db2 main $::snapshot
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db2 eval { SELECT * FROM x1 }
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} {z zz zzz}
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do_test 6.4 {
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db2 close
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sqlite3 db2 test.db
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db2 eval "PRAGMA application_id"
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db2 eval "BEGIN"
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sqlite3_snapshot_open db2 main $::snapshot
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db2 eval { SELECT * FROM x1 }
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} {z zz zzz}
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do_test 6.5 {
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db2 close
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sqlite3 db2 test.db
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db2 eval "BEGIN"
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list [catch {sqlite3_snapshot_open db2 main $::snapshot} msg] $msg
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} {1 SQLITE_ERROR}
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sqlite3_snapshot_free $snapshot
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#-------------------------------------------------------------------------
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# The following tests investigate the sqlite3_snapshot_cmp() API.
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#
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# Compare snapshots $p1 and $p2, checking that the result is $r.
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#
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proc do_snapshot_cmp_test {tn p1 p2 r} {
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uplevel [list do_test $tn.1 [list sqlite3_snapshot_cmp $p1 $p2] $r]
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uplevel [list do_test $tn.2 [list sqlite3_snapshot_cmp $p2 $p1] [expr $r*-1]]
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uplevel [list do_test $tn.3 [list sqlite3_snapshot_cmp $p1 $p1] 0]
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uplevel [list do_test $tn.4 [list sqlite3_snapshot_cmp $p2 $p2] 0]
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}
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catch { db2 close }
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reset_db
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do_execsql_test 7.1 {
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PRAGMA journal_mode = wal;
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CREATE TABLE t1(x);
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} wal
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do_test 7.1.2 {
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execsql { BEGIN ; PRAGMA application_id }
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set p1 [sqlite3_snapshot_get db main]
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execsql {
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INSERT INTO t1 VALUES(10);
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COMMIT;
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}
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execsql { BEGIN ; PRAGMA application_id }
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set p2 [sqlite3_snapshot_get db main]
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execsql COMMIT
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} {}
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do_snapshot_cmp_test 7.1.3 $p1 $p2 -1
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sqlite3_snapshot_free $p1
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sqlite3_snapshot_free $p2
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do_execsql_test 7.2.1 {
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INSERT INTO t1 VALUES(11);
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INSERT INTO t1 VALUES(12);
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INSERT INTO t1 VALUES(13);
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BEGIN;
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PRAGMA application_id;
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} {0}
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do_test 7.2.2 {
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set p1 [sqlite3_snapshot_get db main]
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execsql {
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COMMIT;
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INSERT INTO t1 VALUES(14);
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PRAGMA wal_checkpoint;
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BEGIN;
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PRAGMA application_id;
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}
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set p2 [sqlite3_snapshot_get db main]
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execsql COMMIT
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} {}
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do_snapshot_cmp_test 7.2.3 $p1 $p2 -1
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sqlite3_snapshot_free $p2
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do_test 7.3.1 {
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execsql {
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INSERT INTO t1 VALUES(14);
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BEGIN;
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PRAGMA application_id;
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}
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set p2 [sqlite3_snapshot_get db main]
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execsql COMMIT
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} {}
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do_snapshot_cmp_test 7.3.2 $p1 $p2 -1
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sqlite3_snapshot_free $p1
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sqlite3_snapshot_free $p2
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finish_test
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