mysql 存储过程输入输出参数示例

drop PROCEDURE if exists my_procedure; 
create PROCEDURE my_procedure(in my_id int,out my_name char) 
BEGIN  
 select list_name into my_name from aa_list where list_id=my_id; 
end; 
call my_procedure(24,@a); 
select @a;
drop PROCEDURE if exists m