存储过程参数问题

[gloomyrancher]

create procedure notesystem_createaddressbook
(@loginname char(20) ,@addressbookname char(20))
as
Declare @userid int
select userid from userinfo where username = @loginname)
set @userid = userid ------为什么不能让userid附值给@userid
if not exists(select * from addressbook where addressbookname = @addressbookname and owneruserid = @userid)
insert into Addressbook(owneruserid,addressbookname) values (@userid ,@addressbookname)
go


@loginname 和 @addressbookname 是外面传近来的参数

问题是如何在存储过程中另建1个参数让select语句查询出来的值附给它

[jointan]

改成:
create procedure notesystem_createaddressbook
(@loginname char(20) ,@addressbookname char(20))
as
Declare @userid int
select @userid=userid from userinfo where username = @loginname)
if not exists(select * from addressbook where addressbookname = @addressbookname and owneruserid = @userid)
insert into Addressbook(owneruserid,addressbookname) values (@userid ,@addressbookname)
go

[gloomyrancher]

1楼的我得到结果还是 无法将 NULL 值插入列 'OwnerUserId'，表 'EnterpriceShortMessage.dbo.AddressBook'；该列不允许空值。INSERT 失败。语句已终止。
说明@userid没得到select到的userid吧

[jointan]

如果userinfo不存在含有@loginname的记录,那么@userid就是NULL

[king_xuan]

create procedure notesystem_createaddressbook
(@loginname char(20) ,@addressbookname char(20))
as
Declare @userid int
SET @userid=(select userid from userinfo where username = @loginname)
if not exists(select * from addressbook where addressbookname = @addressbookname and owneruserid = @userid)
insert into Addressbook(owneruserid,addressbookname) values (@userid ,@addressbookname)
go

[gloomyrancher]

晕~~以上方法都试过是~还是同样的问题~~~~不知道是不是SET @userid=(select userid from userinfo where username = @loginname)或select @userid=userid from userinfo where username = @loginname)语法是不能把值附给它的~~有别的方法也发来看看~

[gloomyrancher]

杂么沉了~~~没人知道了吗~

[jointan]

select @userid=userid from userinfo where username = @loginname)
这种写法是没问题的,你查一下是不是别的原因吧
比如你提供的参数有没有可匹配记录,char(20)是否可以容纳参数内容等等

[gloomyrancher]

好象是session的问题~我在页面1里Session["LoginName"] = this.TextBox1.Text.Trim();
在页面2用string loginname = Convert.ToString(Session["loginname"]);为什么得不到呢~

[gloomyrancher]

问题找到了~~是在得到session之前我把页面跳转掉了~~哎~看样子还要做2年菜鸟~~给分结帖~~~谢谢大家~~~~