CREATE PROCEDURE dbo.CheckUpdateUser
(
	@Session_id text,
	@Session_datetime datetime,
	@Session_user_ip varchar( 16 ),
	@Session_old datetime,
        @Session_user_nick_name varchar( 20 )
)
AS
	set nocount on
	
	IF EXISTS (Select * from fo_session where session_id LIKE @Session_id)
	BEGIN
	       Update fo_session set session_datetime = @Session_datetime
                    WHERE session_id LIKE @Session_id
	END
	ELSE
	BEGIN
	       INSERT INTO fo_session (session_id, session_user_name, session_user_ip, session_datetime) 
                   VALUES(@Session_id, @Session_nick_name, @Session_user_ip, @Session_datetime)
	END
					 
	DELETE FROM fo_session where session_datetime < @Session_old
GO