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-- source include/have_innodb.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;
--echo #
--echo # Old lock method (where LOCK TABLE was ignored by InnoDB) no longer
--echo # works when LOCK TABLE ... WRITE is used due to fix for bugs #46272
--echo # "MySQL 5.4.4, new MDL: unnecessary and bug #37346 "innodb does not
--echo # detect deadlock between update and alter table". But it still works
--echo # for LOCK TABLE ... READ.
--echo #
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;
--echo # Connection 'con2'.
connection con2;
set autocommit=0;
set @@innodb_table_locks=0;
--echo # The following statement should block because SQL-level lock
--echo # is taken on t1 which will wait until concurrent transaction
--echo # is commited.
--echo # Sending:
--send lock table t1 write;
--echo # Connection 'con1'.
connection con1;
--echo # Wait until LOCK TABLE is blocked on SQL-level lock.
let $wait_condition=
select count(*) = 1 from information_schema.processlist
where state = "Waiting for table metadata lock" and
info = "lock table t1 write";
--source include/wait_condition.inc
--echo # We should be able to do UPDATEs and SELECTs within transaction.
update t1 set x=1 where id = 0;
select * from t1;
--echo # Unblock LOCK TABLE.
commit;
--echo # Connection 'con2'.
connection con2;
--echo # Reap LOCK TABLE.
--reap
unlock tables;
--echo # Connection 'con1'.
connection con1;
select * from t1 where id = 0 for update;
--echo # Connection 'con2'.
connection con2;
--echo # The below statement should not be blocked as LOCK TABLES ... READ
--echo # does not take strong SQL-level lock on t1. SELECTs which do not
--echo # conflict with transaction in the first connections should not be
--echo # blocked.
lock table t1 read;
select * from t1;
select * from t1 where id = 1 lock in share mode;
unlock tables;
select * from t1;
commit;
--echo # Connection 'con1'.
connection con1;
commit;
drop table t1;
# End of 4.1 tests
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