Current File : //usr/share/mysql-test/suite/innodb/r/foreign_key.result
#
# Bug #19027905 ASSERT RET.SECOND DICT_CREATE_FOREIGN_CONSTRAINTS_LOW
# DICT_CREATE_FOREIGN_CONSTR
#
create table t1 (f1 int primary key) engine=InnoDB;
create table t2 (f1 int primary key,
constraint c1 foreign key (f1) references t1(f1),
constraint c1 foreign key (f1) references t1(f1)) engine=InnoDB;
ERROR HY000: Cannot add foreign key constraint
create table t2 (f1 int primary key,
constraint c1 foreign key (f1) references t1(f1)) engine=innodb;
alter table t2 add constraint c1 foreign key (f1) references t1(f1);
ERROR 23000: Can't write; duplicate key in table '#sql-temporary'
set foreign_key_checks = 0;
alter table t2 add constraint c1 foreign key (f1) references t1(f1);
ERROR HY000: Duplicate foreign key constraint name 'test/c1'
drop table t2, t1;
#
# Bug #20031243 CREATE TABLE FAILS TO CHECK IF FOREIGN KEY COLUMN
# NULL/NOT NULL MISMATCH
#
set foreign_key_checks = 1;
show variables like 'foreign_key_checks';
Variable_name Value
foreign_key_checks ON
CREATE TABLE t1
(a INT NOT NULL,
b INT NOT NULL,
INDEX idx(a)) ENGINE=InnoDB;
CREATE TABLE t2
(a INT KEY,
b INT,
INDEX ind(b),
FOREIGN KEY (b) REFERENCES t1(a) ON DELETE CASCADE ON UPDATE CASCADE)
ENGINE=InnoDB;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) NOT NULL,
`b` int(11) NOT NULL,
KEY `idx` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`a` int(11) NOT NULL,
`b` int(11) DEFAULT NULL,
PRIMARY KEY (`a`),
KEY `ind` (`b`),
CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`a`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1
INSERT INTO t1 VALUES (1, 80);
INSERT INTO t1 VALUES (2, 81);
INSERT INTO t1 VALUES (3, 82);
INSERT INTO t1 VALUES (4, 83);
INSERT INTO t1 VALUES (5, 84);
INSERT INTO t2 VALUES (51, 1);
INSERT INTO t2 VALUES (52, 2);
INSERT INTO t2 VALUES (53, 3);
INSERT INTO t2 VALUES (54, 4);
INSERT INTO t2 VALUES (55, 5);
SELECT a, b FROM t1 ORDER BY a;
a b
1 80
2 81
3 82
4 83
5 84
SELECT a, b FROM t2 ORDER BY a;
a b
51 1
52 2
53 3
54 4
55 5
INSERT INTO t2 VALUES (56, 6);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`a`) ON DELETE CASCADE ON UPDATE CASCADE)
ALTER TABLE t1 CHANGE a id INT;
SELECT id, b FROM t1 ORDER BY id;
id b
1 80
2 81
3 82
4 83
5 84
SELECT a, b FROM t2 ORDER BY a;
a b
51 1
52 2
53 3
54 4
55 5
# Operations on child table
INSERT INTO t2 VALUES (56, 6);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)
UPDATE t2 SET b = 99 WHERE a = 51;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `t1` (`id`) ON DELETE CASCADE ON UPDATE CASCADE)
DELETE FROM t2 WHERE a = 53;
SELECT id, b FROM t1 ORDER BY id;
id b
1 80
2 81
3 82
4 83
5 84
SELECT a, b FROM t2 ORDER BY a;
a b
51 1
52 2
54 4
55 5
# Operations on parent table
DELETE FROM t1 WHERE id = 1;
UPDATE t1 SET id = 50 WHERE id = 5;
SELECT id, b FROM t1 ORDER BY id;
id b
2 81
3 82
4 83
50 84
SELECT a, b FROM t2 ORDER BY a;
a b
52 2
54 4
55 50
DROP TABLE t2, t1;
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