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