drop table if exists t1;
create table t1(c1 int primary key, c2 int);
insert into t1 values(1,1);
set autocommit=0;
insert into t1 values(1,1);
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
rollback;
insert into t1 values(1,1);
ERROR 23000: Duplicate entry '1' for key 'PRIMARY'
rollback;