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SET @@session.storage_engine = 'MyISAM';
create table t1 (a int,
b int as (a/10),
c int as (a/10) persistent);
create table t2 (a timestamp);
create trigger trg1 before insert on t1 for each row
begin
if (new.b < 10) then
set new.a:= 100;
set new.b:= 9;
set new.c:= 9;
end if;
if (new.c > 50) then
set new.a:= 500;
end if;
end|
create trigger trg2 after insert on t1 for each row
begin
if (new.b >= 60) then
insert into t2 values (now());
end if;
end|
create function f1()
returns int
begin
declare sum1 int default '0';
declare cur1 cursor for select sum(b) from t1;
open cur1;
fetch cur1 into sum1;
close cur1;
return sum1;
end|
set sql_warnings = 1;
insert into t1 (a) values (200);
select * from t1;
a b c
200 20 20
select * from t2;
a
insert into t1 (a) values (10);
select * from t1;
a b c
200 20 20
100 10 10
select * from t2;
a
insert into t1 (a) values (600);
select * from t1;
a b c
200 20 20
100 10 10
500 50 50
select * from t2;
a
select f1();
f1()
80
set sql_warnings = 0;
drop trigger trg1;
drop trigger trg2;
drop table t2;
create procedure p1()
begin
declare i int default '0';
create table t2 like t1;
insert into t2 (a) values (100), (200);
begin
declare cur1 cursor for select sum(c) from t2;
open cur1;
fetch cur1 into i;
close cur1;
if (i=30) then
insert into t1 values (300,default,default);
end if;
end;
end|
delete from t1;
call p1();
select * from t2;
a b c
100 10 10
200 20 20
select * from t1;
a b c
300 30 30
drop table t1,t2;
drop procedure p1;
|
