asp.net技术内幕的书配源码

				CREATE PROCEDURE DBRegister
				(
				  @username Varchar( 100 ),
				  @password Varchar( 100 )
				)
				AS
				
				IF EXISTS( SELECT u_id
				  FROM UserList
				  WHERE u_username=@username )
				  RETURN - 1
				ELSE
				  INSERT UserList (
				    u_username,
				    u_password
				    ) VALUES (
				    @username,
				    @password
				    )
				  RETURN @@IDENTITY