下文介绍的mysql存储过程是带参数的存储过程(动态执行sql语句),该mysql存储过程是根据用户输入的条件和排序方式查询用户的信息,排序条件可以没有调用方式:
call getusersdynamic('age
/********动态查询用户的信息********/ create procedure getusersdynamic(wherecondition varchar(500),orderbyexpress varchar(100)) begin declare stmt varchar(2000); if length(orderbyexpress)>0 then begin set @sqlstr=concat('select id,name,password,age,getdate(adddate) as adddate from users where ',wherecondition,' order by ',orderbyexpress); end; else begin set @sqlstr=concat('select id,name,password,age,getdate(adddate) as adddate from users where ',wherecondition); end; end if; prepare stmt from @sqlstr; execute stmt; end;
getdate()是一个自定义的函数,作用是返回日期的短格式
create definer=`root`@`localhost` function `getdate`($date datetime) returns varchar(50) charset latin1 return date_format($date,'%y-%m-%d');
动态插入数据的mysql存储过程,(注意四个单引号表示一个一引号):
create definer=`root`@`localhost` procedure `insertuser`(in name2 varchar(50),in password2 varchar(32),in age2 int,in adddate2 datetime) begin declare stmt varchar(2000); set @sqlstr=concat('insert into users(name,password,age,adddate) values('); set @sqlstr=concat(@sqlstr,'''',name2,'''',',','''',password2,'''',',',age2,',','''',adddate2,'''',')'); prepare stmt from @sqlstr; execute stmt; end;
