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extend prelocking to FK-accessed tables

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Backport of f136291098
This commit is contained in:
Sergei Golubchik
2018-07-17 16:56:40 +02:00
parent 3b365fa829
commit 64a23c1c8a
6 changed files with 157 additions and 4 deletions
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37
mysql-test/suite/innodb/r/foreign-keys.result
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@ -14,3 +14,40 @@ ALTER TABLE `title` ADD FOREIGN KEY (`title_manager_fk`) REFERENCES `people`
ALTER TABLE `title` ADD FOREIGN KEY (`title_reporter_fk`) REFERENCES `people`
(`people_id`);
drop table title, department, people;
create table t1 (a int primary key, b int) engine=innodb;
create table t2 (c int primary key, d int,
foreign key (d) references t1 (a) on update cascade) engine=innodb;
insert t1 values (1,1),(2,2),(3,3);
insert t2 values (4,1),(5,2),(6,3);
flush table t2 with read lock;
connect con1,localhost,root;
delete from t1 where a=2;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`d`) REFERENCES `t1` (`a`) ON UPDATE CASCADE)
update t1 set a=10 where a=1;
connection default;
unlock tables;
connection con1;
connection default;
lock table t2 write;
connection con1;
delete from t1 where a=2;
connection default;
unlock tables;
connection con1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`d`) REFERENCES `t1` (`a`) ON UPDATE CASCADE)
connection default;
unlock tables;
disconnect con1;
create user foo;
grant select,update on test.t1 to foo;
connect foo,localhost,foo;
update t1 set a=30 where a=3;
disconnect foo;
connection default;
select * from t2;
c d
5 2
4 10
6 30
drop table t2, t1;
drop user foo;