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一点实例明白mysql数据库存储过程_MySQL

WBOY
WBOYOriginal
2016-06-01 13:02:14959browse

mysql存储过程: 封装sql:

create procedure p1()
begin
select  * from t_news;

end $         //mysql存储过程 简单实例
显示存储过程信息: \G (横向表格采用纵向表格输出)

\

delimiter $ 改变执行符号,直到mysql碰到$ 开始执行语句命令 set names 解决mysql乱码问题 但mysql重启后又还原到以前字符集状态
call 存储过程名字 () 调用存储过程
参数:
create procedure p2(n int)    #含参
begin
select  * from t_category where cid > n;
end $      
\

控制结构:
create procedure p3(n int, j char(1))    #含参
begin  
if j='h'  then       #与其他语言不同 必须加then 注意符号= 不是==
 select  * from t_category where cid > n;
else
select  * from t_category where cid <n;   
end if;
end $    
\

计算1....n的和:
create procedure p4(n smallint)    #含参
begin  
declare  i int;
declare s int;
set s = 0;
set i = 1;
while i<=n do
set s =s+i;
set i=i+1;
end while;
select s;
end $      
\

存储过程和函数的区别: 名称不同 :存储过程:procedure 函数function 存储过程没有返回值

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