存储过程
查看现有的存储过程
Show procedure status \G;
\G 横着显示
delimiter ;或者$ 定义结尾标志;或者$
刪除存储过程
Drop procedure 存儲過程名字
(1)
create procedure p1()
begin
select * from s_organization_type;
end$
调用存储过程
Call 存储过程名字();
(2)
create procedure p2(num int)
begin
select * from s_organization_type a where a.sot_id>num;
end$
call p2(3) 取出主键大于3的信息
(3)
create procedure p3(num int,s char(4))
begin
if s=‘true‘ then
select * from s_organization_type a where a.sot_id>num;
else
select * from s_organization_type a where a.sot_id<num;
end if;
end$
call p3(5,‘true‘)
传入的参数s的值为‘true’時,查询主键大于5的语句,否则执行小于5的语句
(4)
create procedure p4(num smallint)
begin
declare i int default 1;
declare temp int default 0;
while i<=num do
set temp=temp+i;
set i=i+1;
end while;
select temp;
end$
存储过程和函数
procedure function
存储过程没有返回值
函數
create function ..
begin
RETURN 0;
end$
===========================================
游标
declare continue handler for not found set nomore=0;
continue handler 触发后继续执行后面的代码
exit handler 触发后后面的代码不执行
undo 触发后后面的代码被撤消
(1)
create procedure p5()
begin
declare row_sotid int;
declare row_sotname varchar(20);
declare row_viewseq tinyint;
declare cnt int default 0;
declare i int default 0;
declare cursor_sot cursor for select sot_id,sot_name,view_seq from s_organization_type; --申明游标
select count(*) into cnt from s_organization_type; --給cnt赋值
open cursor_sot; --打开游标
repeat --循环
set i:=i+1; --每次循环增1
fetch cursor_sot into row_sotid,row_sotname,row_viewseq;
select row_sotid,row_sotname,row_viewseq; --打印数据
until i>=cnt end repeat; --停止循环 当i等于count(*)时
close cursor_sot; --关闭游标
end$
(2)
create procedure p6()
begin
declare row_sotid int;
declare row_sotname varchar(20);
declare row_viewseq tinyint;
declare nomore int default 1;
declare cursor_sot cursor for select sot_id,sot_name,view_seq from s_organization_type;
declare continue handler for not found set nomore=0; --当读取不到数据时把nomore设为0,然后停止循环
open cursor_sot;
while nomore != 0 do
fetch cursor_sot into row_sotid,row_sotname,row_viewseq;
select row_sotid,row_sotname;
end while;
close cursor_sot;
end$
(3)
CREATE PROCEDURE `p6`()
begin
declare row_sotid int;
declare row_sotname varchar(20);
declare row_viewseq tinyint;
declare nomore int default 1;
declare cursor_sot cursor for select sot_id,sot_name,view_seq from s_organization_type;
declare continue handler for not found set nomore=0;
open cursor_sot;
while nomore<>0 do
fetch cursor_sot into row_sotid,row_sotname,row_viewseq;
if nomore <> 0 then
select row_sotid,row_sotname;
end if;
end while;
close cursor_sot;
select ‘1‘;
end
