分页的数据访问

CREATE PROCEDURE northwind_OrdersPaged
(
    @PageIndex int,
    @PageSize int
)
AS
BEGIN
DECLARE @PageLowerBound int
DECLARE @PageUpperBound int
DECLARE @RowsToReturn int

-- First set the rowcount
SET @RowsToReturn = @PageSize * (@PageIndex + 1)
SET ROWCOUNT @RowsToReturn

-- Set the page bounds
SET @PageLowerBound = @PageSize * @PageIndex
SET @PageUpperBound = @PageLowerBound + @PageSize + 1

-- Create a temp table to store the select results
CREATE TABLE #PageIndex
(
    IndexId int IDENTITY (1, 1) NOT NULL,
    OrderID int
)

-- Insert into the temp table
INSERT INTO #PageIndex (OrderID)
SELECT
    OrderID
FROM
    Orders
ORDER BY
    OrderID DESC

-- Return total count
SELECT COUNT(OrderID) FROM Orders

-- Return paged results
SELECT
    O.*
FROM
    Orders O,
    #PageIndex PageIndex
WHERE
    O.OrderID = PageIndex.OrderID AND
    PageIndex.IndexID > @PageLowerBound AND
    PageIndex.IndexID < @PageUpperBound
ORDER BY
    PageIndex.IndexID

END