select_safe.test

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

#
# test of safe selects
#

--disable_warnings
drop table if exists t1;
--enable_warnings

SET SQL_SAFE_UPDATES=1,SQL_SELECT_LIMIT=4, SQL_MAX_JOIN_SIZE=9;
create table t1 (a int auto_increment primary key, b char(20));
insert into t1 values(1,"test");
SELECT SQL_BUFFER_RESULT * from t1;
update t1 set b="a" where a=1;
delete from t1 where a=1;
insert into t1 values(1,"test"),(2,"test2");
SELECT SQL_BUFFER_RESULT * from t1;
update t1 set b="a" where a=1;
select 1 from t1,t1 as t2,t1 as t3;

# The following should give errors:
--error 1175
update t1 set b="a";
--error 1175
update t1 set b="a" where b="test";
--error 1175
delete from t1;
--error 1175
delete from t1 where b="test";
--error 1175
delete from t1 where a+0=1;
--error 1104
select 1 from t1,t1 as t2,t1 as t3,t1 as t4,t1 as t5;

# The following should be ok:
update t1 set b="a" limit 1;
update t1 set b="a" where b="b" limit 2; 
delete from t1 where b="test" limit 1;
delete from t1 where a+0=1 limit 2;

# Test SQL_BIG_SELECTS

alter table t1 add key b (b);
SET MAX_JOIN_SIZE=2;
SELECT @@MAX_JOIN_SIZE, @@SQL_BIG_SELECTS;
insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
--error 1104
SELECT * from t1 order by a;
SET SQL_BIG_SELECTS=1;
SELECT * from t1 order by a;
SET MAX_JOIN_SIZE=2;
--error 1104
SELECT * from t1;
SET MAX_JOIN_SIZE=DEFAULT;
SELECT * from t1;

#
# Test MAX_SEEKS_FOR_KEY
#
analyze table t1;
insert into t1 values (null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a"),(null,"a");
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
set MAX_SEEKS_FOR_KEY=1;
explain select STRAIGHT_JOIN * from t1,t1 as t2 where t1.b=t2.b;
SET MAX_SEEKS_FOR_KEY=DEFAULT;

drop table t1;

# BUG#8726
create table t1 (a int);
insert into t1 values (1),(2),(3),(4),(5);
insert into t1 select * from t1;
insert into t1 select * from t1;
insert into t1 select * from t1;

set local  max_join_size=8;
--error 1104
select * from (select * from t1) x;

set local  max_join_size=1;
--error 1104
select * from (select a.a as aa, b.a as ba from t1 a, t1 b) x;

set local  max_join_size=1;
--error 1104
select * from (select 1 union select 2 union select 3) x;
drop table t1;

SET SQL_SAFE_UPDATES=0,SQL_SELECT_LIMIT=DEFAULT, SQL_MAX_JOIN_SIZE=DEFAULT;

# End of 4.1 tests