[ Avaa Bypassed ]

#
# 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;