mirror of
https://github.com/MariaDB/server.git
synced 2025-01-29 02:05:57 +01:00
d5fc34db4c
Problem: ======== - InnoDB should have two keys on the same column for the self referencing foreign key relation. Solution: ========= - Allow self referential foreign key relation to work with one key.
92 lines
3.6 KiB
Text
92 lines
3.6 KiB
Text
#
|
|
# TRUNCATE TABLE
|
|
#
|
|
# Truncating is disallowed for parent tables unless such table
|
|
# participates in self-referencing foreign keys only.
|
|
#
|
|
CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
|
|
CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
|
|
TRUNCATE TABLE t1;
|
|
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`))
|
|
# 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;
|
|
# Truncation of self-referencing table should succeed.
|
|
TRUNCATE TABLE t1;
|
|
DROP TABLE t1;
|
|
#
|
|
# Also, truncating such tables is allowed if foreign key
|
|
# checks are disabled.
|
|
#
|
|
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;
|
|
TRUNCATE TABLE t1;
|
|
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`))
|
|
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;
|
|
TRUNCATE TABLE t1;
|
|
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`))
|
|
UNLOCK TABLES;
|
|
DROP TABLE t3,t2,t1;
|
|
SET @@SESSION.foreign_key_checks = @old_foreign_key_checks;
|
|
#
|
|
# Test that TRUNCATE resets auto-increment.
|
|
#
|
|
CREATE TABLE t1 (a INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
|
|
b INT, c INT, d INT, e INT, f INT, g INT, h INT, i INT, j INT, k INT,
|
|
l INT, m INT, n INT, o INT, p INT, q INT, r INT, s INT, t INT, u INT,
|
|
KEY(b),KEY(c),KEY(d),KEY(e),KEY(f),KEY(g),KEY(h),KEY(i),KEY(j),KEY(k),
|
|
KEY(l),KEY(m),KEY(n),KEY(o),KEY(p),KEY(q),KEY(r),KEY(s),KEY(t),KEY(u),
|
|
KEY(c,b),KEY(d,b),KEY(e,b),KEY(f,b),KEY(g,b),KEY(h,b),KEY(i,b),KEY(j,b),
|
|
KEY(k,b),KEY(l,b),KEY(m,b),KEY(n,b),KEY(o,b),KEY(p,b),KEY(q,b),KEY(r,b),
|
|
KEY(s,b),KEY(t,b),KEY(u,b),
|
|
KEY(d,c),KEY(e,c),KEY(f,c),KEY(g,c),KEY(h,c),KEY(i,c),KEY(j,c),
|
|
KEY(k,c),KEY(l,c),KEY(m,c),KEY(n,c),KEY(o,c),KEY(p,c),KEY(q,c),KEY(r,c),
|
|
KEY(s,c),KEY(t,c),KEY(u,c),
|
|
KEY(e,d),KEY(f,d),KEY(g,d),KEY(h,d),KEY(i,d),KEY(j,d)
|
|
) ENGINE=InnoDB;
|
|
INSERT INTO t1 () VALUES (), ();
|
|
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
|
|
AUTO_INCREMENT
|
|
3
|
|
SELECT a FROM t1 ORDER BY a;
|
|
a
|
|
1
|
|
2
|
|
TRUNCATE TABLE t1;
|
|
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
|
|
AUTO_INCREMENT
|
|
1
|
|
INSERT INTO t1 () VALUES (), ();
|
|
SELECT a FROM t1 ORDER BY a;
|
|
a
|
|
1
|
|
2
|
|
DROP TABLE t1;
|
|
call mtr.add_suppression('InnoDB: in RENAME TABLE table `test`.`t3`');
|
|
SET FOREIGN_KEY_CHECKS= OFF;
|
|
CREATE TABLE t1 (f2 INT, f4 INT, KEY(f2), FOREIGN KEY (f4) REFERENCES t3 (f4)) ENGINE=InnoDB;
|
|
SET FOREIGN_KEY_CHECKS= ON;
|
|
CREATE TABLE t2 (f2 INT, FOREIGN KEY(f2) REFERENCES t1 (f2)) ENGINE=InnoDB;
|
|
CREATE TABLE t3 (a INT) ENGINE=InnoDB;
|
|
ERROR HY000: Can't create table `test`.`t3` (errno: 150 "Foreign key constraint is incorrectly formed")
|
|
ALTER TABLE t1 RENAME TO t3;
|
|
ALTER TABLE t3 FORCE;
|
|
TRUNCATE TABLE t3;
|
|
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`))
|
|
DROP TABLE t2, t3;
|