打开workbench,点击下面的按钮

编写存储过程

CREATE DEFINER=`root`@`localhost` PROCEDURE `new_procedure10`(IN myId int,IN myTitle varchar(20),IN myContent varchar(20))
BEGIN
if myTitle is NULL then 
select title into myTitle from blog where id=myId; 
end if;
if myContent is NULL then 
select content into myContent from blog where id=myId;
end if;

update blog set title = myTitle,content=myContent
where id=myId;
END

if…then …end if条件语句
IN 接受参数
Select…into赋值变量

调用存储过程

Call new_ procedure10(1,NULL,NULL) 和call new_procedure10(1,’测试标题’ ,’测试正文’)