<div class="codebody" id="code693"> if exists(select 1 from sys.objects where name = 'GetProductsCount' and type = 'P') drop proc GetProductsCount go CREATE PROCEDURE GetProductsCount as select count() from products go --1.使用Top if exists(select 1 from sys.objects where name = 'GetProductsByPage' and type = 'P') drop proc GetProductsByPage go CREATE PROCEDURE GetProductsByPage @PageNumber int, @PageSize int AS declare @sql nvarchar(4000) set @sql = 'select top ' + Convert(varchar,@PageSize) + ' from products where productid not in (select top ' + Convert(varchar,(@PageNumber - 1) @PageSize) + ' productid from products)' exec sp_executesql @sql go --exec GetProductsByPage 1,10 --exec GetProductsByPage 5,10 --2.使用临时表 if exists(select 1 from sys.objects where name = 'GetProductsByPage' and type = 'P') drop proc GetProductsByPage go CREATE PROCEDURE GetProductsByPage @PageNumber int, @PageSize int AS -- 创建临时表 CREATE TABLE #TempProducts ( ID int IDENTITY PRIMARY KEY, ProductID int, ProductName varchar(40), SupplierID int, CategoryID int, QuantityPerUnit nvarchar(20), UnitPrice money, UnitsInStock smallint, UnitsOnOrder smallint, ReorderLevel smallint, Discontinued bit ) -- 填充临时表 INSERT INTO #TempProducts (ProductID,ProductName,SupplierID,CategoryID,QuantityPerUnit,UnitPrice,UnitsInStock,UnitsOnOrder,ReorderLevel,Discontinued) SELECT ProductID,Discontinued FROM Products DECLARE @FromID int DECLARE @ToID int SET @FromID = ((@PageNumber - 1) @PageSize) + 1 SET @ToID = @PageNumber @PageSize SELECT ProductID,Discontinued FROM #TempProducts WHERE ID >= @FromID AND ID <= @ToID go --exec GetProductsByPage 1,10 --3.使用表变量 / 为要分页的数据创建一个table变量,这个table变量里有一个作为主健的IDENTITY列.这样需要分页的每条记录在table变量里就和一个row index(通过IDENTITY列)关联起来了.一旦table变量产生,连接数据库表的SELECT语句就被执行,获取需要的记录.SET ROWCOUNT用来限制放到table变量里的记录的数量. 当SET ROWCOUNT的值指定为PageNumber PageSize时,这个方法的效率取决于被请求的页数.对于比较前面的页来说– 比如开始几页的数据– 这种方法非常有效. 但是对接近尾部的页来说,这种方法的效率和默认分页时差不多 / if exists(select 1 from sys.objects where name = 'GetProductsByPage' and type = 'P') drop proc GetProductsByPage go CREATE PROCEDURE GetProductsByPage @PageNumber int, @PageSize int AS DECLARE @TempProducts TABLE ( ID int IDENTITY, productid int ) DECLARE @maxRows int SET @maxRows = @PageNumber @PageSize --在返回指定的行数之后停止处理查询 SET ROWCOUNT @maxRows INSERT INTO @TempProducts (productid) SELECT productid FROM products ORDER BY productid SET ROWCOUNT @PageSize SELECT p. FROM @TempProducts t INNER JOIN products p ON t.productid = p.productid WHERE ID > (@PageNumber - 1) @PageSize SET ROWCOUNT 0 GO --exec GetProductsByPage 1,10 --4.使用row_number函数 --SQL Server 2005的新特性,它可以将记录根据一定的顺序排列,每条记录和一个等级相关 这个等级可以用来作为每条记录的row index. if exists(select 1 from sys.objects where name = 'GetProductsByPage' and type = 'P') drop proc GetProductsByPage go CREATE PROCEDURE GetProductsByPage @PageNumber int, @PageSize int AS select ProductID,Discontinued from (select row_number() Over (order by productid) as row,ProductID,Discontinued from products) as ProductsWithRowNumber where row between (@PageNumber - 1) @PageSize + 1 and @PageNumber * @PageSize go --exec GetProductsByPage 1,10
