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18 lines
858 B
Text
18 lines
858 B
Text
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CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY, b INT) ENGINE = InnoDB;
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INSERT INTO t1 VALUES (1,1),(2,2),(3,3);
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COMMIT;
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SET AUTOCOMMIT = 0;
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CREATE TEMPORARY TABLE t1_tmp ( b INT );
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INSERT INTO t1_tmp (b) SELECT b FROM t1 WHERE a = 3;
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INSERT INTO t1_tmp (b) SELECT b FROM t1 WHERE a = 2;
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SET AUTOCOMMIT = 0;
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CREATE TEMPORARY TABLE t2_tmp ( a int, new_a int );
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INSERT INTO t2_tmp VALUES (1,51),(2,52),(3,53);
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UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 1;
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UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 2;
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INSERT INTO t1_tmp (b) SELECT b FROM t1 WHERE a = 1;
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ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
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Reap the server message for connection user2 UPDATE t1 ...
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UPDATE t1 SET a = (SELECT new_a FROM t2_tmp WHERE t2_tmp.a = t1.a) WHERE a = 3;
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DROP TABLE t1;
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