如何在SQL Server 2012存储过程中声明表变量？

Question

I'm trying to create a stored procedure but the following problem occurs:

Msg 2715, Level 16, State 3, Procedure usp_UpatePriv, Line 1
Column, parameter, or variable #1: Cannot find data type tblScreen. Parameter or variable '@screen' has an invalid data type.

Msg 1087, Level 16, State 1, Procedure usp_UpatePriv, Line 8
Must declare the table variable "@screen".

This is the stored procedure:

create procedure usp_UpatePriv
    @screen tblScreen Readonly
as
    declare @username nvarchar(50)
    declare @prev bit
    declare @idscreen bigint

    declare privlange cursor for
        (select username, idScren, Prev from @screen)

    open privlange

    fetch next from privlange into @username, @idscreen, @prev

    while @@FETCH_STATUS = 0  
    begin
        update tblScreenPriv 
        set Prev = @prev 
        where Username = @username and idScreen = @idscreen

        fetch next from privlange into @username, @idscreen, @prev
    end

    close privlange;  
    deallocate privlange;

Answer 1

You need to declare the Table-Valued Type, and you should get rid of the cursor. EG:

create type tblScreen as table(username nvarchar(50), idScren int, Prev bit)
go

create proc usp_UpatePriv
 @screen  tblScreen Readonly
as
begin
        with q as 
        (
          select o.Prev, n.Prev NewPrev
          tblScreenPriv o
          join @screen n
            on o.UserName = n.UserName
           and o.idScreen = n.idScreen
        )
        --select * from q
        update q set Prev = NewPrev;
end