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call mtr.add_suppression("InnoDB: In ALTER TABLE .* has or is referenced in foreign key constraints which are not compatible with the new table definition.");
# modify child column NOT NULL on UPDATE CASCADE..parent column NULL
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, FOREIGN KEY(f1) REFERENCES t1(f2) ON UPDATE CASCADE)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f1 INT NOT NULL;
ERROR HY000: Column 'f1' cannot be NOT NULL: needed in a foreign key constraint 't2_ibfk_1' SET NULL
DROP TABLE t2, t1;
# modify child column NOT NULL ON DELETE CASCADE..parent column NULL
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, FOREIGN KEY(f1) REFERENCES t1(f2) ON DELETE CASCADE)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f1 INT NOT NULL;
DROP TABLE t2, t1;
# modify child column NOT NULL ON UPDATE SET NULL
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, f2 INT, FOREIGN KEY(f1) REFERENCES t1(f1) ON UPDATE SET NULL)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f1 INT NOT NULL;
ERROR HY000: Column 'f1' cannot be NOT NULL: needed in a foreign key constraint 't2_ibfk_1' SET NULL
DROP TABLE t2, t1;
# modify child column NOT NULL ON DELETE SET NULL
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, f2 INT, FOREIGN KEY (f2) REFERENCES t1(f2) ON DELETE SET NULL)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f2 INT NOT NULL;
ERROR HY000: Column 'f2' cannot be NOT NULL: needed in a foreign key constraint 't2_ibfk_1' SET NULL
DROP TABLE t2, t1;
# modify child column NOT NULL ON UPDATE RESTRICT..parent column NULL
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, f2 INT, FOREIGN KEY (f2) REFERENCES t1(f2) ON UPDATE RESTRICT)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f2 INT NOT NULL;
DROP TABLE t2, t1;
# modify child column NOT NULL ON DELETE RESTRICT..parent column NULL
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, f2 INT, FOREIGN KEY (f2) REFERENCES t1(f2) ON DELETE RESTRICT)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f2 INT NOT NULL;
DROP TABLE t2, t1;
# modify child column NOT NULL ON UPDATE NO ACTION..PARENT COLUMN NULL
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, f2 INT, FOREIGN KEY (f2) REFERENCES t1(f2) ON UPDATE NO ACTION)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f2 INT NOT NULL;
DROP TABLE t2, t1;
# modify child column NOT NULL ON DELETE NO ACTION..PARENT COLUMN NULL
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, f2 INT, FOREIGN KEY (f2) REFERENCES t1(f2) ON DELETE NO ACTION)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f2 INT NOT NULL;
DROP TABLE t2, t1;
# modify parent column NULL ON UPDATE CASCADE child column NOT NULL
CREATE TABLE `t#1`(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE `t#2`(f1 INT NOT NULL,
FOREIGN KEY(f1) REFERENCES `t#1`(f2)
ON UPDATE CASCADE)ENGINE=InnoDB;
ALTER TABLE `t#1` MODIFY COLUMN f2 INT;
ERROR HY000: Cannot change column 'f2': used in a foreign key constraint 't#2_ibfk_1' of table 'test.t#2'
DROP TABLE `t#2`, `t#1`;
# modify parent column NULL ON DELETE CASCADE child column NOT NULL
CREATE TABLE t1(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT NOT NULL, FOREIGN KEY(f1) REFERENCES t1(f2) ON DELETE CASCADE)ENGINE=InnoDB;
ALTER TABLE t1 MODIFY COLUMN f2 INT;
DROP TABLE t2, t1;
# modify parent column NULL ON UPDATE SET NULL child column NOT NULL
CREATE TABLE t1(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT NOT NULL, FOREIGN KEY(f1) REFERENCES t1(f2) ON UPDATE SET NULL)ENGINE=InnoDB;
ERROR HY000: Can't create table `test`.`t2` (errno: 150 "Foreign key constraint is incorrectly formed")
DROP TABLE t1;
# modify parent column NULL ON DELETE SET NULL child NOT NULL
CREATE TABLE t1(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT NOT NULL, FOREIGN KEY(f1) REFERENCES t1(f2) ON DELETE SET NULL)ENGINE=InnoDB;
ERROR HY000: Can't create table `test`.`t2` (errno: 150 "Foreign key constraint is incorrectly formed")
DROP TABLE t1;
# modify parent column NULL ON UPDATE RESTRICT child column NOT NULL
CREATE TABLE t1(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT NOT NULL, FOREIGN KEY(f1) REFERENCES t1(f2) ON UPDATE RESTRICT)ENGINE=InnoDB;
ALTER TABLE t1 MODIFY COLUMN f2 INT;
DROP TABLE t2, t1;
# modify parent column NULL ON DELETE RESTRICT child column NOT NULL
CREATE TABLE t1(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT NOT NULL, FOREIGN KEY(f1) REFERENCES t1(f2) ON UPDATE RESTRICT)ENGINE=InnoDB;
ALTER TABLE t1 MODIFY COLUMN f2 INT;
DROP TABLE t2, t1;
# modify parent column NULL ON UPDATE NO ACTION child column NOT NULL
CREATE TABLE t1(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT NOT NULL, FOREIGN KEY(f1) REFERENCES t1(f2) ON UPDATE NO ACTION)ENGINE=InnoDB;
ALTER TABLE t1 MODIFY COLUMN f2 INT;
DROP TABLE t2, t1;
# modify parent column NULL ON DELETE NO ACTION child column NOT NULL
CREATE TABLE t1(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT NOT NULL, FOREIGN KEY(f1) REFERENCES t1(f2) ON DELETE NO ACTION)ENGINE=InnoDB;
ALTER TABLE t1 MODIFY COLUMN f2 INT;
DROP TABLE t2, t1;
# foreign key constraint for multiple columns
# modify parent column NULL ON UPDATE CASCADE child column NOT NULL
CREATE TABLE t1(f1 INT NOT NULL, f2 INT NOT NULL,
INDEX(f1, f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
INDEX(f1, f2),
FOREIGN KEY(f1, f2) REFERENCES t1(f1, f2) ON
UPDATE CASCADE)ENGINE=InnoDB;
ALTER TABLE t1 MODIFY COLUMN f1 INT;
ERROR HY000: Cannot change column 'f1': used in a foreign key constraint 't2_ibfk_1' of table 'test.t2'
DROP TABLE t2, t1;
# modify child column NOT NULL ON UPDATE CASCADE parent column NULL
CREATE TABLE t1(f1 INT, f2 INT, INDEX(f1, f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, f2 INT, INDEX(f1, f2),
FOREIGN KEY(f1, f2) REFERENCES t1(f1, f2) ON
UPDATE CASCADE)ENGINE=InnoDB;
ALTER TABLE t2 MODIFY COLUMN f2 INT NOT NULL;
ERROR HY000: Column 'f2' cannot be NOT NULL: needed in a foreign key constraint 't2_ibfk_1' SET NULL
DROP TABLE t2, t1;
# allow foreign key constraints when parent table created later
SET FOREIGN_KEY_CHECKS=0;
CREATE TABLE t2(f1 INT, FOREIGN KEY(f1) REFERENCES t1(f2) ON UPDATE CASCADE)ENGINE=InnoDB;
SET FOREIGN_KEY_CHECKS=1;
ALTER TABLE t2 MODIFY COLUMN f1 INT NOT NULL;
CREATE TABLE t1(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
INSERT INTO t1 VALUES(1, 1);
INSERT INTO t2 VALUES(1);
UPDATE t1 SET f2= NULL;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`f1`) REFERENCES `t1` (`f2`) ON UPDATE CASCADE)
SELECT * FROM t2;
f1
1
SET FOREIGN_KEY_CHECKS=0;
UPDATE t1 SET f2= NULL;
SELECT * FROM t2;
f1
1
DROP TABLE t2, t1;
# Modify column + Drop column & Drop foreign key constraint
CREATE TABLE t1(f1 INT, f2 INT, KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, f2 INT, f3 INT,
FOREIGN KEY fdx(f2) REFERENCES t1(f1),
FOREIGN KEY fdx2(f3) REFERENCES t1(f2))ENGINE=InnoDB;
ALTER TABLE t2 MODIFY f2 INT NOT NULL, DROP FOREIGN KEY fdx;
ALTER TABLE t2 ADD FOREIGN KEY fdx (f2) REFERENCES t1(f1);
ALTER TABLE t2 DROP COLUMN f2, DROP FOREIGN KEY fdx;
DROP TABLE t2, t1;
# Drop foreign index & modify column
CREATE TABLE `t#1`(f1 INT, f2 INT NOT NULL, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE `t#2`(f1 INT NOT NULL, FOREIGN KEY(f1) REFERENCES `t#1`(f2) ON UPDATE CASCADE)ENGINE=InnoDB;
SET FOREIGN_KEY_CHECKS=0;
ALTER TABLE `t#2` DROP INDEX f1;
SET FOREIGN_KEY_CHECKS=1;
ALTER TABLE `t#1` MODIFY COLUMN f2 INT;
DROP TABLE `t#2`, `t#1`;
# Drop referenced index and modify column
CREATE TABLE `t#1`(f1 INT, f2 INT, PRIMARY KEY(f1), KEY(f2))ENGINE=InnoDB;
CREATE TABLE `t#2`(f1 INT, FOREIGN KEY(f1) REFERENCES `t#1`(f2) ON UPDATE CASCADE)ENGINE=InnoDB;
SET FOREIGN_KEY_CHECKS=0;
ALTER TABLE `t#1` DROP INDEX f2;
SET FOREIGN_KEY_CHECKS=1;
ALTER TABLE `t#2` MODIFY COLUMN f1 INT NOT NULL;
DROP TABLE `t#2`, `t#1`;
# Self referential modifying column
CREATE TABLE t1(f1 INT, f2 INT, index(f2), foreign key(f1) references t1(f2) ON UPDATE CASCADE)engine=innodb;
ALTER TABLE t1 MODIFY COLUMN f2 INT NOT NULL;
ALTER TABLE t1 MODIFY COLUMN f1 INT NOT NULL;
ALTER TABLE t1 MODIFY COLUMN f1 INT;
DROP TABLE t1;
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