Edit File: innodb-truncate.test
--source include/have_innodb.inc --echo # --echo # TRUNCATE TABLE --echo # --echo # Truncating is disallowed for parent tables unless such table --echo # participates in self-referencing foreign keys only. --echo # CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB; CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB; --error ER_TRUNCATE_ILLEGAL_FK TRUNCATE TABLE t1; --echo # Truncation of child should succeed. TRUNCATE TABLE t2; DROP TABLE t2; DROP TABLE t1; CREATE TABLE t1 (pk INT PRIMARY KEY, fk INT, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB; --echo # Truncation of self-referencing table should succeed. TRUNCATE TABLE t1; DROP TABLE t1; --echo # --echo # Also, truncating such tables is allowed if foreign key --echo # checks are disabled. --echo # SET @old_foreign_key_checks = @@SESSION.foreign_key_checks; CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB; CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB; CREATE TABLE t3 (pk INT PRIMARY KEY, fk INT, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB; SET @@SESSION.foreign_key_checks = 0; TRUNCATE TABLE t1; TRUNCATE TABLE t2; TRUNCATE TABLE t3; SET @@SESSION.foreign_key_checks = 1; --error ER_TRUNCATE_ILLEGAL_FK TRUNCATE TABLE t1; TRUNCATE TABLE t2; TRUNCATE TABLE t3; LOCK TABLES t1 WRITE; SET @@SESSION.foreign_key_checks = 0; TRUNCATE TABLE t1; SET @@SESSION.foreign_key_checks = 1; --error ER_TRUNCATE_ILLEGAL_FK TRUNCATE TABLE t1; UNLOCK TABLES; DROP TABLE t3,t2,t1; SET @@SESSION.foreign_key_checks = @old_foreign_key_checks; --echo # --echo # Test that TRUNCATE resets auto-increment. --echo # CREATE TABLE t1 (a INT PRIMARY KEY NOT NULL AUTO_INCREMENT); INSERT INTO t1 VALUES (NULL), (NULL); SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1'; SELECT * FROM t1 ORDER BY a; TRUNCATE TABLE t1; SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1'; INSERT INTO t1 VALUES (NULL), (NULL); SELECT * FROM t1 ORDER BY a; DROP TABLE t1;
Back to File Manager