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27 lines
631 B
Text
27 lines
631 B
Text
CREATE TABLE t1 (f1 BLOB) ENGINE=InnoDB;
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INSERT INTO t1 VALUES (NULL),('abc');
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SELECT f1 FROM t1;
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f1
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NULL
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abc
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DELETE FROM t1 WHERE f1 IS NULL;
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UPDATE t1 SET f1 = 'xyz' WHERE f1 = 'abc';
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SELECT COUNT(*) = 1 FROM t1;
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COUNT(*) = 1
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1
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SELECT f1 = 'abc' FROM t1;
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f1 = 'abc'
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0
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CREATE TABLE t2 (f1 BLOB) ENGINE=InnoDB;
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INSERT INTO t2 VALUES (NULL);
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SET AUTOCOMMIT=OFF;
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START TRANSACTION;
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UPDATE t2 SET f1 = 'abc' WHERE f1 IS NULL;
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SET AUTOCOMMIT=OFF;
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START TRANSACTION;
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UPDATE t2 SET f1 = 'xyz' WHERE f1 IS NULL;
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COMMIT;
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COMMIT;
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ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
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DROP TABLE t1;
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DROP TABLE t2;
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