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-- source include/have_innodb_plugin.inc
#
# Check and select innodb lock type
#
set global innodb_table_locks=1;
select @@innodb_table_locks;
#
# Testing of explicit table locks with enforced table locks
#
connect (con1,localhost,root,,);
connect (con2,localhost,root,,);
--disable_warnings
drop table if exists t1;
--enable_warnings
#
# Testing of explicit table locks with enforced table locks
#
set @@innodb_table_locks=1;
connection con1;
create table t1 (id integer, x integer) engine=INNODB;
insert into t1 values(0, 0);
set autocommit=0;
SELECT * from t1 where id = 0 FOR UPDATE;
connection con2;
set autocommit=0;
# The following statement should hang because con1 is locking the page
--send
lock table t1 write;
--sleep 2
connection con1;
update t1 set x=1 where id = 0;
select * from t1;
commit;
connection con2;
reap;
update t1 set x=2 where id = 0;
commit;
unlock tables;
connection con1;
select * from t1;
commit;
drop table t1;
#
# Try with old lock method (where LOCK TABLE is ignored by InnoDB)
#
set @@innodb_table_locks=0;
create table t1 (id integer primary key, x integer) engine=INNODB;
insert into t1 values(0, 0),(1,1),(2,2);
commit;
SELECT * from t1 where id = 0 FOR UPDATE;
connection con2;
set autocommit=0;
set @@innodb_table_locks=0;
# The following statement should work becase innodb doesn't check table locks
lock table t1 write;
connection con1;
# This will be locked by MySQL
--send
update t1 set x=10 where id = 2;
--sleep 2
connection con2;
# Note that we will get a deadlock if we try to select any rows marked
# for update by con1 !
SELECT * from t1 where id = 2;
UPDATE t1 set x=3 where id = 2;
commit;
SELECT * from t1;
commit;
unlock tables;
connection con1;
reap;
commit;
select * from t1;
drop table t1;
# End of 4.1 tests
|
