connect con1,localhost,root,,;
connect con2,localhost,root,,;
drop table if exists t1,t2;
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;
id x 00
connection con2; set autocommit=0;
update t1 set x=2 where id = 0;
connection con1;
update t1 set x=1 where id = 0;
select * from t1;
id x 01
commit;
connection con2;
commit;
connection con1;
select * from t1;
id x 02
commit;
drop table t1;
connection con1;
create table t1 (id integer, x integer) engine = InnoDB;
create table t2 (b integer, a integer) engine = InnoDB;
insert into t1 values(0, 0), (300, 300);
insert into t2 values(0, 10), (1, 20), (2, 30);
commit; set autocommit=0;
select * from t2;
b a 010 120 230
update t2 set a=100 where b=(SELECT x from t1 where id = b FOR UPDATE);
select * from t2;
b a 0100 120 230
select * from t1;
id x 00 300300
connection con2; set autocommit=0;
update t1 set x=2 where id = 0;
connection con1;
update t1 set x=1 where id = 0;
select * from t1;
id x 01 300300
commit;
connection con2;
commit;
connection con1;
select * from t1;
id x 02 300300
commit;
drop table t1, t2;
create table t1 (id integer, x integer) engine = InnoDB;
create table t2 (b integer, a integer) engine = InnoDB;
insert into t1 values(0, 0), (300, 300);
insert into t2 values(0, 0), (1, 20), (2, 30);
commit;
connection con1;
select a,b from t2 UNION (SELECT id, x from t1 FOR UPDATE);
a b 00 201 302 300300
select * from t2;
b a 00 120 230
select * from t1;
id x 00 300300
connection con2;
update t2 set a=2 where b = 0;
update t1 set x=2 where id = 0;
connection con1;
update t1 set x=1 where id = 0;
select * from t1;
id x 01 300300
commit;
connection con2;
commit;
connection con1;
select * from t1;
id x 02 300300
commit;
connection default;
disconnect con1;
disconnect con2;
drop table t1, t2;
End of 4.1 tests set default_storage_engine=innodb;
drop table if exists a;
drop table if exists A;
create table A (c int);
insert into A (c) values (0);
create table a as select * from A;
drop table A;
drop table if exists a; set default_storage_engine=default;
End of 5.0 tests.
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.0 Sekunden
(vorverarbeitet am 2026-10-08)
¤
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