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82 lines
3.1 KiB
Plaintext
82 lines
3.1 KiB
Plaintext
#
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# TRUNCATE TABLE
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#
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# Truncating is disallowed for parent tables unless such table
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# participates in self-referencing foreign keys only.
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#
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CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
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CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
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# Truncation of child should succeed.
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TRUNCATE TABLE t2;
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DROP TABLE t2;
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DROP TABLE t1;
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CREATE TABLE t1 (pk INT PRIMARY KEY, fk INT,
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FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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# Truncation of self-referencing table should succeed.
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TRUNCATE TABLE t1;
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DROP TABLE t1;
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#
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# Also, truncating such tables is allowed if foreign key
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# checks are disabled.
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#
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SET @old_foreign_key_checks = @@SESSION.foreign_key_checks;
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CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
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CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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CREATE TABLE t3 (pk INT PRIMARY KEY, fk INT,
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FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
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SET @@SESSION.foreign_key_checks = 0;
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TRUNCATE TABLE t1;
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TRUNCATE TABLE t2;
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TRUNCATE TABLE t3;
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SET @@SESSION.foreign_key_checks = 1;
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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
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TRUNCATE TABLE t2;
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TRUNCATE TABLE t3;
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LOCK TABLES t1 WRITE;
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SET @@SESSION.foreign_key_checks = 0;
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TRUNCATE TABLE t1;
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SET @@SESSION.foreign_key_checks = 1;
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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
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UNLOCK TABLES;
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DROP TABLE t3,t2,t1;
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SET @@SESSION.foreign_key_checks = @old_foreign_key_checks;
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#
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# Test that TRUNCATE resets auto-increment.
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#
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CREATE TABLE t1 (a INT PRIMARY KEY NOT NULL AUTO_INCREMENT);
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INSERT INTO t1 VALUES (NULL), (NULL);
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SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
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AUTO_INCREMENT
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3
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SELECT * FROM t1 ORDER BY a;
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a
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1
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2
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TRUNCATE TABLE t1;
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SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
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AUTO_INCREMENT
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1
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INSERT INTO t1 VALUES (NULL), (NULL);
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SELECT * FROM t1 ORDER BY a;
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a
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1
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2
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DROP TABLE t1;
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call mtr.add_suppression('InnoDB: Error: in RENAME TABLE table `test`.`t3`');
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SET FOREIGN_KEY_CHECKS= OFF;
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CREATE TABLE t1 (f2 INT, f4 INT, KEY(f2), FOREIGN KEY (f4) REFERENCES t3 (f4)) ENGINE=InnoDB;
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SET FOREIGN_KEY_CHECKS= ON;
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CREATE TABLE t2 (f2 INT, FOREIGN KEY(f2) REFERENCES t1 (f2)) ENGINE=InnoDB;
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CREATE TABLE t3 (a INT) ENGINE=InnoDB;
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ERROR HY000: Can't create table `test`.`t3` (errno: 150 "Foreign key constraint is incorrectly formed")
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ALTER TABLE t1 RENAME TO t3;
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ERROR HY000: Error on rename of './test/t1' to './test/t3' (errno: 150 "Foreign key constraint is incorrectly formed")
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ALTER TABLE t1 FORCE;
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TRUNCATE TABLE t1;
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ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`f2`) REFERENCES `test`.`t3` (`f2`))
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DROP TABLE t2, t1;
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