include/master-slave.inc
[connection master]
CREATE TABLE t1 (a INT AUTO_INCREMENT KEY) ENGINE=INNODB;
CREATE TABLE t2 (b INT AUTO_INCREMENT KEY, c INT, FOREIGN KEY(b) REFERENCES t1(a)) ENGINE=INNODB;
SET FOREIGN_KEY_CHECKS=0;
INSERT INTO t1 VALUES (10);
INSERT INTO t1 VALUES (NULL),(NULL),(NULL);
INSERT INTO t2 VALUES (5,0);
INSERT INTO t2 VALUES (NULL,LAST_INSERT_ID());
SET FOREIGN_KEY_CHECKS=1;
SELECT * FROM t1 ORDER BY a;
a
10
11
12
13
SELECT * FROM t2 ORDER BY b;
b	c
5	0
6	11
connection slave;
SELECT * FROM t1 ORDER BY a;
a
10
11
12
13
SELECT * FROM t2 ORDER BY b;
b	c
5	0
6	11
connection master;
SET TIMESTAMP=1000000000;
CREATE TABLE t3 ( a INT UNIQUE );
SET FOREIGN_KEY_CHECKS=0;
INSERT INTO t3 VALUES (1),(1);
ERROR 23000: Duplicate entry '1' for key 'a'
connection slave;
connection master;
SET FOREIGN_KEY_CHECKS=0;
DROP TABLE IF EXISTS t1,t2,t3;
SET FOREIGN_KEY_CHECKS=1;
connection slave;
connection master;
create table t1 (b int primary key) engine = INNODB;
create table t2 (a int primary key, b int, foreign key (b) references t1(b)) engine = INNODB;
insert into t1 set b=1;
insert into t2 set a=1, b=1;
set foreign_key_checks=0;
delete from t1;
must sync w/o a problem (could not with the buggy code)
connection slave;
select count(*) from t1 /* must be zero */;
count(*)
0
connection master;
drop table t2,t1;
set foreign_key_checks=1;
#
# MDEV-25530 Error 1451 on slave: Cannot delete or update a parent row: a foreign key constraint fails
#
create table t1 (id int primary key)engine=innodb;
create table t2 (id int not null primary key auto_increment,
id2 int default null,  key f1 (id2),
constraint f1 foreign key (id2) references t1 (id) on delete cascade) engine=innodb;
drop table t1,t2;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails
connection slave;
show tables;
Tables_in_test
t1
connection master;
drop table t1;
connection slave;
include/rpl_end.inc