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#
# Bug#20837 Apparent change of isolation level 
#           during transaction
#
# Bug#53343 completion_type=1, COMMIT/ROLLBACK 
#           AND CHAIN don't preserve the isolation 
#           level
connection default;
SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
CREATE TABLE t1 (s1 INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1),(2);
COMMIT;
START TRANSACTION;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
ERROR 25001: Transaction isolation level can't be changed while a transaction is in progress
COMMIT;
SET @@autocommit=0;
COMMIT;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
START TRANSACTION;
SELECT @@tx_isolation;
@@tx_isolation
REPEATABLE-READ
Should be REPEATABLE READ
SELECT * FROM t1;
s1
1
2
SELECT @@tx_isolation;
@@tx_isolation
REPEATABLE-READ
Should be REPEATABLE READ
INSERT INTO t1 VALUES (-1);
SELECT @@tx_isolation;
@@tx_isolation
REPEATABLE-READ
Should be REPEATABLE READ
COMMIT;
START TRANSACTION;
SELECT * FROM t1;
s1
1
2
-1
SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
connection con1
START TRANSACTION;
INSERT INTO t1 VALUES (1000);
COMMIT;
connection default
We should not be able to read the '1000'
SELECT * FROM t1;
s1
1
2
-1
COMMIT;
Now, the '1000' should appear.
START TRANSACTION;
SELECT * FROM t1;
s1
1
2
-1
1000
COMMIT;
SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
connection default
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
START TRANSACTION;
connection con1
START TRANSACTION;
INSERT INTO t1 VALUES (1001);
COMMIT;
connection default
SELECT COUNT(*) FROM t1 WHERE s1 = 1001;
COUNT(*)
1
Should be 1
COMMIT AND CHAIN;
connection con1
INSERT INTO t1 VALUES (1002);
COMMIT;
connection default
SELECT COUNT(*) FROM t1 WHERE s1 = 1002;
COUNT(*)
1
Should be 1
COMMIT;
SELECT * FROM t1;
s1
1
2
-1
1000
1001
1002
DELETE FROM t1 WHERE s1 >= 1000;
COMMIT;
connection default
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
START TRANSACTION;
connection con1
START TRANSACTION;
INSERT INTO t1 VALUES (1001);
COMMIT;
connection default
SELECT COUNT(*) FROM t1 WHERE s1 = 1001;
COUNT(*)
1
Should be 1
ROLLBACK AND CHAIN;
connection con1
INSERT INTO t1 VALUES (1002);
COMMIT;
connection default
SELECT COUNT(*) FROM t1 WHERE s1 = 1002;
COUNT(*)
1
Should be 1
COMMIT;
SELECT * FROM t1;
s1
1
2
-1
1001
1002
DELETE FROM t1 WHERE s1 >= 1000;
COMMIT;
SET @@completion_type=1;
connection default
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
START TRANSACTION;
connection con1
START TRANSACTION;
INSERT INTO t1 VALUES (1001);
COMMIT;
connection default
SELECT * FROM t1 WHERE s1 >= 1000;
s1
1001
Should see 1001
COMMIT AND NO CHAIN;
default transaction is now in REPEATABLE READ
connection con1
INSERT INTO t1 VALUES (1002);
COMMIT;
connection default
SELECT * FROM t1 WHERE s1 >= 1000;
s1
1001
1002
Should see 1001 and 1002
connection con1
INSERT INTO t1 VALUES (1003);
COMMIT;
connection default
SELECT * FROM t1 WHERE s1 >= 1000;
s1
1001
1002
Should see 1001 and 1002, but NOT 1003
COMMIT;
SELECT * FROM t1;
s1
1
2
-1
1001
1002
1003
DELETE FROM t1 WHERE s1 >= 1000;
COMMIT AND NO CHAIN;
SET @@completion_type=0;
COMMIT;
connection default
SET @@completion_type=1;
COMMIT AND NO CHAIN;
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
START TRANSACTION;
connection con1
START TRANSACTION;
INSERT INTO t1 VALUES (1001);
COMMIT;
connection default
SELECT * FROM t1 WHERE s1 >= 1000;
s1
1001
Should see 1001
ROLLBACK AND NO CHAIN;
default transaction is now in REPEATABLE READ
connection con1
INSERT INTO t1 VALUES (1002);
COMMIT;
connection default
SELECT * FROM t1 WHERE s1 >= 1000;
s1
1001
1002
Should see 1001 and 1002
connection con1
INSERT INTO t1 VALUES (1003);
COMMIT;
connection default
SELECT * FROM t1 WHERE s1 >= 1000;
s1
1001
1002
Should see 1001 and 1002, but NOT 1003
COMMIT;
SELECT * FROM t1;
s1
1
2
-1
1001
1002
1003
DELETE FROM t1 WHERE s1 >= 1000;
COMMIT AND NO CHAIN;
SET @@completion_type=0;
COMMIT;
connection default
SET TRANSACTION ISOLATION LEVEL	READ COMMITTED;
SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
START TRANSACTION;
SELECT * FROM t1;
s1
1
2
-1
connection con1
INSERT INTO t1 VALUES (1000);
COMMIT;
connection default
SELECT * FROM t1;
s1
1
2
-1
Should get same result as above (i.e should not read '1000')
COMMIT;
DELETE FROM t1 WHERE s1 >= 1000;
COMMIT;
SET @@completion_type=1;
COMMIT AND NO CHAIN;
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
START TRANSACTION;
TRUNCATE TABLE t1;
INSERT INTO t1 VALUES (1000);
SELECT * FROM t1;
s1
1000
Should read '1000'
connection con1
INSERT INTO t1 VALUES (1001);
COMMIT;
connection default
SELECT * FROM t1;
s1
1000
Should only read the '1000' as this transaction is now in REP READ
COMMIT AND NO CHAIN;
SET @@completion_type=0;
COMMIT AND NO CHAIN;
SET @autocommit=1;
COMMIT;
DROP TABLE t1;
#
# End of test cases for Bug#20837
#

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