问具有大量数据的可排序表的最佳方法

EN

CREATE PROCEDURE GetProductsInCategory
(@CategoryID INT,
@DescriptionLength INT,
@PageNumber INT,
@ProductsPerPage INT,
@HowManyProducts INT OUTPUT)
AS

-- declare a new TABLE variable
DECLARE @Products TABLE
(RowNumber INT,
 ProductID INT,
 Name VARCHAR(50),
 Description VARCHAR(5000),
 Price MONEY,
 Image1FileName VARCHAR(50),
 Image2FileName VARCHAR(50),
 OnDepartmentPromotion BIT,
 OnCatalogPromotion BIT)

-- populate the table variable with the complete list of products
INSERT INTO @Products
SELECT ROW_NUMBER() OVER (ORDER BY Product.ProductID),
       Product.ProductID, Name, 
       SUBSTRING(Description, 1, @DescriptionLength) + '...' AS Description,
       Price, Image1FileName, Image2FileName, OnDepartmentPromotion, OnCatalogPromotion
FROM Product INNER JOIN ProductCategory
  ON Product.ProductID = ProductCategory.ProductID
WHERE ProductCategory.CategoryID = @CategoryID

-- return the total number of products using an OUTPUT variable
SELECT @HowManyProducts = COUNT(ProductID) FROM @Products

-- extract the requested page of products
SELECT ProductID, Name, Description, Price, Image1FileName,
       Image2FileName, OnDepartmentPromotion, OnCatalogPromotion
FROM @Products
WHERE RowNumber > (@PageNumber - 1) * @ProductsPerPage
  AND RowNumber <= @PageNumber * @ProductsPerPage