MySQL触发器、存储过程、自定义函数、视图简单示例

mysql> use test;
mysql> create table userinfo(userid int,username varchar(10),userbirthday date);
mysql> create table userinfolog(logtime datetime,loginfo varchar(100));
mysql> describe userinfo;
1.触发器
mysql> delimiter |
mysql> create trigger beforeinsertuserinfo
    -> before insert on userinfo
    -> for each row begin
    ->   insert into userinfolog values(now(),CONCAT(new.userid,new.username));
    -> end;
    -> |
mysql> delimiter ;
mysql> show triggers;
2.存储过程
mysql> delimiter //
mysql> create procedure spinsertuserinfo(
    -> puserid int,pusername varchar(10)
    -> ,puserbirthday date
    -> )
    -> begin
    ->  insert into userinfo values(puserid,pusername,puserbirthday);
    -> end;
    -> //
mysql> show procedure status like 'spinsertuserinfo';
mysql> call spinsertuserinfo(1,'zhangsan',current_date);
mysql> select * from userinfo;

3.自定义函数
mysql> update userinfo
    -> set userbirthday='2000.01.01'
    -> where userid='1';
mysql> drop function if exists fngetage;
mysql> delimiter //
mysql> create function fngetage(pbirthday date)
    -> returns integer
    -> begin
    ->  return year(now()) - year(pbirthday);
    -> end
    -> //
4.视图
mysql> create view viewuserinfo
    -> as select * ,fngetage(userbirthday) as userage from userinfo;
mysql> select * from viewuserinfo;
清除日志记录
mysql> truncate table userinfolog;
mysql> delete from userinfolog;
 

本文转摘自『蓝派网』http://www.lan27.com/Article/200807/7557.htm