[MYSQL]存储过程使用范例
发表于2017-08-06
本篇文章给大家介绍的是存储过程使用范例。存储过程封装了一系列的数据库操作,这样既方便了程序中调用,也加快了数据库访问速度。同时一些简单的逻辑修改也不用直接修改程序,直接修改存储过程即可。
CREATE DEFINER=`admin`@`%` PROCEDURE `addrankex`(in _gameid varchar(32), in _deviceid varchar(64), in _ip varchar(32), in _level int, in _score int, in _cleartime int) BEGIN declare _errcode int default 0; #发生异常时_errcode置1 declare continue handler for sqlexception set _errcode = 1;#非声明语句必须放在所有声明语句的后面,否者会报错。 start transaction; #初始化参数 set @deviceid = _deviceid; set @ip = _ip; set @level = _level; set @score = _score; set @cleartime = _cleartime; set @sameusercount = 0; set @currenttime = now(); set @best = 0; set @current = 0; set @strsql = concat('select count(*) into @sameusercount from ', _gameid, '_rank where deviceid=@deviceid and level=@level'); prepare stmt from @strsql; execute stmt; deallocate prepare stmt; if @sameusercount > 0 then #更新 set @strsql = concat('update ', _gameid, '_rank set score=@score,cleartime=@cleartime,ip=@ip,time=@currenttime where deviceid=@deviceid and level=@level and score<@score'); prepare stmt from @strsql; execute stmt; deallocate prepare stmt; else #添加 set @strsql = concat('insert into ', _gameid, '_rank (deviceid, level, score, cleartime, ip, count, time) values (@deviceid, @level, @score, @cleartime, @ip, 1, @currenttime)'); prepare stmt from @strsql; execute stmt; deallocate prepare stmt; end if; set @strsql = concat('update ', _gameid, '_rank set count=count 1 where deviceid=@deviceid and level=@level'); prepare stmt from @strsql; execute stmt; deallocate prepare stmt; #错误处理 if _errcode = 0 then commit;#提交 set @strsql = concat('select (count(*) 1) into @best from ', _gameid, '_rank where deviceid!=@deviceid and level=@level and score>(select score from ', _gameid, '_rank where deviceid=@deviceid and level=@level)'); prepare stmt from @strsql; execute stmt; deallocate prepare stmt; set @strsql = concat('select (count(*) 1) into @current from ', _gameid, '_rank where deviceid!=@deviceid and level=@level and score>@score'); prepare stmt from @strsql; execute stmt; deallocate prepare stmt; select @current as current,@best as best; else rollback;#回滚 select _errcode as errcode; end if; END