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drop table if exists t1;
create table t1 (id integer, x integer) type=INNODB;
insert into t1 values(0, 0);
set autocommit=0;
SELECT * from t1 where id = 0 FOR UPDATE;
id x
0 0
set autocommit=0;
update t1 set x=2 where id = 0;
update t1 set x=1 where id = 0;
select * from t1;
id x
0 1
commit;
commit;
select * from t1;
id x
0 2
commit;
drop table t1;
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