Question

ALTER PROCEDURE [dbo].[getMessages]
    -- Add the parameters for the stored procedure here
    @lastRow int,
    @sort varchar(9)
AS
BEGIN
    -- Insert statements for procedure here
    DECLARE @StartRow INT,@EndRow INT
    SELECT @StartRow = (@lastRow + 1), @EndRow = (@lastRow + 6)

;WITH cte AS (SELECT ROW_NUMBER() OVER (ORDER BY
        CASE WHEN @sort = 'votes1' THEN m.votes END DESC,
        CASE WHEN @sort = 'votes2' THEN m.votes END ASC
      ) AS rows,
      m.message,
      m.messageId,
      TotalCount = COUNT(m.messageId) OVER ( PARTITION BY NULL)
    FROM
      tblMessages m
    WHERE
      m.deleted != 1
      )
     SELECT * 
     FROM cte WHERE ROWS BETWEEN @StartRow AND @EndRow
    ORDER BY rows
END

So this is my proc that I use for paging so on the front end I can pass in the last row I saw, and then when I click “load more”, it starts from the next row and gets the next 6. Well, not I want the PREVIOUS 6, passing in an id, so if you see 6, go to the next six, and then want to see the previous 6 again.

How would I modify this proc to do that?

Answer 1

You don’t.

Instead, modify your code. The key in the proc is the @lastrow. When you execute it the first time I’m assuming @lastrow = 0. If they go forward, you are executing it with a value of 6.

To go backward, just pass the current value – 6. For example, if you’re on page 20, @lastrow is going to be 114. Subtract 6 in your code and call the proc again.