CREATE TABLE t1 (a INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
connect  con1,localhost,root;
XA START 'x';
UPDATE t1 set a=2;
XA END 'x';
XA PREPARE 'x';
connection default;
disconnect con1;
connect  con1,localhost,root;
SELECT * FROM t1 LOCK IN SHARE MODE;
connection default;
disconnect con1;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
SELECT * FROM t1;
a
2
XA ROLLBACK 'x';
SELECT * FROM t1;
a
1
DROP TABLE t1;