MySql 游标定义时使用临时表

时间:2023-03-09 02:49:04
MySql 游标定义时使用临时表

参考:Re: Temp Table in Select of a Cursor

方法一:

delimiter $$ 

create procedure test_temp()
begin drop temporary table if exists tmp;
create temporary table tmp(id int unsigned);
insert into tmp (id) values (1); begin -- (主要增加Begin与End) declare v_id int unsigned;
declare csr1 cursor for select * from tmp; open csr1;
fetch csr1 into v_id;
select v_id;
close csr1; end; -- (主要增加Begin与End)
end; 
$$
-- 测试使用
call test_temp() ;
$$

方法二:


delimiter $$ 
create procedure test_temp()
begin declare v_id int unsigned;
declare csr1 cursor for select * from tmp; -- 先定义游标

-- 后定义临时表并填充数据
drop temporary table if exists tmp;
create temporary table tmp(id int unsigned);
insert into tmp (id) values (1); open csr1;
fetch csr1 into v_id;
select v_id;
close csr1; end;
$$
-- 测试使用 
call test_temp() ;
$$