146 lines
2.5 KiB
Plaintext
146 lines
2.5 KiB
Plaintext
SET @debug_saved = @@global.debug;
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START TRANSACTION;
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CREATE TABLE t1(a INT PRIMARY KEY AUTO_INCREMENT, b VARCHAR(255)) engine = innodb;
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INSERT INTO t1(b) VALUES ('aaa');
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INSERT INTO t1(b) VALUES ('bbb');
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INSERT INTO t1(b) VALUES ('ccc');
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COMMIT;
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# 1. Start outer transaction with SERIALIZABLE isolation level.
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# Check that SELECT in inner transaction will not take locks.
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# Start transaction.
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SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
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START TRANSACTION;
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# Insert a new row into t1.
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INSERT INTO t1(b) VALUES ('ddd');
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SELECT * FROM t1;
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a b
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1 aaa
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2 bbb
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3 ccc
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4 ddd
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# [another connection]
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SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
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START TRANSACTION;
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SET @@global.debug = '+d,use_attachable_trx';
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SELECT * FROM t1;
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a b
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1 aaa
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2 bbb
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3 ccc
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SET @@global.debug = '-d,use_attachable_trx';
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# [default connection]
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ROLLBACK;
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# 2. Check that inner transaction has different visibility scope than
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# the outer transaction.
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# Start READ ONLY transaction.
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SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
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START TRANSACTION READ ONLY;
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# SELECT to actually start a transaction.
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SELECT * FROM t1;
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a b
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1 aaa
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2 bbb
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3 ccc
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# [another connection]
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START TRANSACTION;
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UPDATE t1 SET b = 'zzz' WHERE a = 2;
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COMMIT;
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# [default connection]
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# SELECT in the outer transaction doesn't see the changes.
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SELECT * FROM t1;
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a b
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1 aaa
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2 bbb
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3 ccc
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# SELECT in the inner transaction sees the changes.
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SET @@global.debug = '+d,use_attachable_trx';
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SELECT * FROM t1;
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a b
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1 aaa
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2 zzz
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3 ccc
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SET @@global.debug = '-d,use_attachable_trx';
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# COMMIT the outer transaction.
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COMMIT;
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# SELECT in the outer transaction now sees the changes.
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SELECT * FROM t1;
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a b
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1 aaa
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2 zzz
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3 ccc
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COMMIT;
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# 3. Check that the inner transaction does not reset a save point set in
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# the outer transaction.
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# Start transaction.
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SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
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START TRANSACTION;
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SELECT * FROM t1;
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a b
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1 aaa
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2 zzz
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3 ccc
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# Set save point.
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SAVEPOINT sp1;
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# Do some changes.
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UPDATE t1 SET b = 'xxx' WHERE a = 2;
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SELECT * FROM t1;
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a b
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1 aaa
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2 xxx
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3 ccc
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# Do anything in the inner transaction.
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SET @@global.debug = '+d,use_attachable_trx';
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SELECT * FROM t1;
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a b
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1 aaa
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2 zzz
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3 ccc
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SET @@global.debug = '-d,use_attachable_trx';
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# Just make sure the changes are still there.
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SELECT * FROM t1;
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a b
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1 aaa
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2 xxx
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3 ccc
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# Rollback to the save point to make sure it was not reset.
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ROLLBACK TO SAVEPOINT sp1;
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# Check that the changes have been reverted.
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SELECT * FROM t1;
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a b
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1 aaa
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2 zzz
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3 ccc
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# Commit.
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COMMIT;
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# Cleanup.
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DROP TABLE t1;
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SET @@global.debug = @debug_saved;
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