一个Mysql的存储过程

DELIMITER $$

DROP PROCEDURE IF EXISTS `tsts_user`.`proc_login`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `proc_login`(id varchar(50), pwd varchar(255), pTypeUser int, ServerIP varchar(20), ip varchar(50), out result int)
begin

#返回记录
#declare ploginid varchar(50);
set @ploginid = null;
set @ppwd = null;
set @pUserType = null;
set @pEndTime = null;
set result = null;

select @ploginid:=`loginid` ,@ppwd:=`password`,@pUserType:=ptype,@pEndTime:=endtime,name,groupname,area,notlogin,validdate,
viewnews,viewgp,viewqh,viewwp,viewwh,viewgg,userlevel, memo,viewgp_max,viewqh_max,viewwp_max,
viewwh_max,viewgg_max,usercfg,begintime,usedtotaltime,
isonline,serverip from product p where loginid=id;

#如果帐户不存在
if(@ploginid is null) then
set result = 1;
else
#如果帐户存在，但是密码不正确
if(@ppwd is null or @ppwd != pwd) then
set result = 2;
else
#如果帐户存在，并且密码正确，但是过期了
if(@pEndTime is null or now() > @pEndTime) then
set result = 3;
else
#如果帐户存在、密码正确、没过期，但是登录类型不正确
if(@pUserType is null or pTypeUser not in (0, 16, 18, @pUserType)) then
set result = 4;
else
##全部正确，进行更新
update product set last_access_time=now(),login_times=login_times+1,isonline=1,serverip=ServerIP,last_access_ip=ip where loginid=id;
end if;
end if;
end if;
end if;

#如果result为空则改变成为0
if(result is null) then
set result = 0;
end if;

end$$

DELIMITER ;