SQL Server 2005中利用临时表和@@RowCount提高分页查询存储过程性能 (转)

原地址：http://www.cnblogs.com/mikel/archive/2009/03/05/1403560.html

以下方法对于是Sql2005/2000都有适用，Row_Number()只有2005才有此功能。

最近发现现有框架的通用查询存储过程的性能慢，于是仔细研究了下代码：

Alter PROCEDURE [dbo].[AreaSelect]
    @PageSize int=0,
    @CurrentPage int=1,
    @Identifier int=NULL,
    @ParentId int=NULL,
    @AreaLevel int=NULL,
    @Children int=NULL,
    @AreaName nvarchar(50)=NULL,
    @Path nvarchar(MAX)=NULL,
    @Status int=NULL,
    @Alt int=NULL
AS
BEGIN
    SET NOCOUNT ON;
    IF (NOT @AreaName IS NULL)    SET @AreaName='%'+@AreaName+'%'
    IF (NOT @Path IS NULL)    SET @Path='%'+@Path+'%'
    IF (@PageSize>0)
    BEGIN
        DECLARE @TotalPage int
        Select @TotalPage=Count(Identifier) FROM Area Where
        (@Identifier IS NULL or Identifier=@Identifier)AND
        (@ParentId IS NULL or ParentId=@ParentId)AND
        (@AreaLevel IS NULL or AreaLevel=@AreaLevel)AND
        (@Children IS NULL or Children=@Children)AND
        (@AreaName IS NULL or AreaName Like @AreaName)AND
        (@Path IS NULL or Path Like @Path)AND
        (@Status IS NULL or Status=@Status)AND
        (@Alt IS NULL or Alt=@Alt)
        IF(@TotalPage%@PageSize=0)
        BEGIN
            SET @TotalPage=@TotalPage/@PageSize
        END
        ELSE
        BEGIN
            SET @TotalPage=Round(@TotalPage/@PageSize,0)+1
        END
        Select TOP (@PageSize) Identifier,ParentId,AreaLevel,Children,AreaName,Path,Status,Alt,@TotalPage as totalPage FROM Area Where 
        Identifier NOT IN (Select Top (@PageSize*(@CurrentPage-1))Identifier FROM Area Where 
        (@Identifier IS NULL or Identifier=@Identifier)AND
        (@ParentId IS NULL or ParentId=@ParentId)AND
        (@AreaLevel IS NULL or AreaLevel=@AreaLevel)AND
        (@Children IS NULL or Children=@Children)AND
        (@AreaName IS NULL or AreaName Like @AreaName)AND
        (@Path IS NULL or Path Like @Path)AND
        (@Status IS NULL or Status=@Status)AND
        (@Alt IS NULL or Alt=@Alt)
            order by AreaName asc)
        AND
        (@Identifier IS NULL or Identifier=@Identifier)AND
        (@ParentId IS NULL or ParentId=@ParentId)AND
        (@AreaLevel IS NULL or AreaLevel=@AreaLevel)AND
        (@Children IS NULL or Children=@Children)AND
        (@AreaName IS NULL or AreaName Like @AreaName)AND
        (@Path IS NULL or Path Like @Path)AND
        (@Status IS NULL or Status=@Status)AND
        (@Alt IS NULL or Alt=@Alt)
            order by AreaName asc
    END
    ELSE
    BEGIN
        Select Identifier,ParentId,AreaLevel,Children,AreaName,Path,Status,Alt FROM Area Where 
        (@Identifier IS NULL or Identifier=@Identifier)AND
        (@ParentId IS NULL or ParentId=@ParentId)AND
        (@AreaLevel IS NULL or AreaLevel=@AreaLevel)AND
        (@Children IS NULL or Children=@Children)AND
        (@AreaName IS NULL or AreaName Like @AreaName)AND
        (@Path IS NULL or Path Like @Path)AND
        (@Status IS NULL or Status=@Status)AND
        (@Alt IS NULL or Alt=@Alt)
            order by AreaName asc
    END
END

发现每次查询都需要按条件查询依次Area表，性能太低，于是利用临时表将符合条件的记录取出来，然后针对临时表进行查询，代码修改如下：
Alter PROCEDURE [dbo].[AreaSelect]
    @PageSize int=0,
    @CurrentPage int=1,
    @Identifier int=NULL,
    @ParentId int=NULL,
    @AreaLevel int=NULL,
    @Children int=NULL,
    @AreaName nvarchar(50)=NULL,
    @Path nvarchar(MAX)=NULL,
    @Status int=NULL,
    @Alt int=NULL
AS
BEGIN
    SET NOCOUNT ON;
    IF (NOT @AreaName IS NULL)    SET @AreaName='%'+@AreaName+'%'
    IF (NOT @Path IS NULL)    SET @Path='%'+@Path+'%'
    
    
    IF (@PageSize>0)
    BEGIN
        --创建临时表
        Select
        Identifier,ParentId,AreaLevel,Children,AreaName,Path,Status,Alt
        INTO #temp_Area 
        FROM Area Where
        (@Identifier IS NULL or Identifier=@Identifier)AND
        (@ParentId IS NULL or ParentId=@ParentId)AND
        (@AreaLevel IS NULL or AreaLevel=@AreaLevel)AND
        (@Children IS NULL or Children=@Children)AND
        (@AreaName IS NULL or AreaName Like @AreaName)AND
        (@Path IS NULL or Path Like @Path)AND
        (@Status IS NULL or Status=@Status)AND
        (@Alt IS NULL or Alt=@Alt)
        order by AreaName asc

        DECLARE @TotalPage int
        DECLARE @SumCount int 
        
        --取总数
        Select @SumCount=Count(Identifier) FROM #temp_Area
        
        IF(@SumCount%@PageSize=0)
        BEGIN
            SET @TotalPage=@SumCount/@PageSize
        END
        ELSE
        BEGIN
            SET @TotalPage=Round(@SumCount/@PageSize,0)+1
        END
        Select TOP (@PageSize) Identifier,ParentId,AreaLevel,Children,AreaName,
        Path,Status,Alt,@TotalPage as totalPage,@SumCount as SumCount
        FROM #temp_Area 
        Where 
        Identifier NOT IN (Select Top (@PageSize*(@CurrentPage-1))Identifier FROM #temp_Area))
    END
    ELSE
    BEGIN
        Select Identifier,ParentId,AreaLevel,Children,AreaName,Path,Status,Alt FROM Area Where 
        (@Identifier IS NULL or Identifier=@Identifier)AND
        (@ParentId IS NULL or ParentId=@ParentId)AND
        (@AreaLevel IS NULL or AreaLevel=@AreaLevel)AND
        (@Children IS NULL or Children=@Children)AND
        (@AreaName IS NULL or AreaName Like @AreaName)AND
        (@Path IS NULL or Path Like @Path)AND
        (@Status IS NULL or Status=@Status)AND
        (@Alt IS NULL or Alt=@Alt)
            order by AreaName asc
    END
END

经过使用临时表的确提高性能，不过有发现一个问题，就是count(Identifier)的确很耗性能，于是又进行修改了
：

Alter PROCEDURE [dbo].[AreaSelect]
    @PageSize int=0,
    @CurrentPage int=1,
    @Identifier int=NULL,
    @ParentId int=NULL,
    @AreaLevel int=NULL,
    @Children int=NULL,
    @AreaName nvarchar(50)=NULL,
    @Path nvarchar(MAX)=NULL,
    @Status int=NULL,
    @Alt int=NULL
AS
BEGIN
    SET NOCOUNT ON;
    IF (NOT @AreaName IS NULL)    SET @AreaName='%'+@AreaName+'%'
    IF (NOT @Path IS NULL)    SET @Path='%'+@Path+'%'
    
    
    IF (@PageSize>0)
    BEGIN
        --创建中记录数
        DECLARE @SumCount int 
        
        --创建临时表
        Select
        Identifier,ParentId,AreaLevel,Children,AreaName,Path,Status,Alt
        INTO #temp_Area 
        FROM Area Where
        (@Identifier IS NULL or Identifier=@Identifier)AND
        (@ParentId IS NULL or ParentId=@ParentId)AND
        (@AreaLevel IS NULL or AreaLevel=@AreaLevel)AND
        (@Children IS NULL or Children=@Children)AND
        (@AreaName IS NULL or AreaName Like @AreaName)AND
        (@Path IS NULL or Path Like @Path)AND
        (@Status IS NULL or Status=@Status)AND
        (@Alt IS NULL or Alt=@Alt)
        order by AreaName asc
        --设置总记录数为刚操作的记录数
        SET @SumCount=@@RowCount
        
        DECLARE @TotalPage int
        
        IF(@SumCount%@PageSize=0)
        BEGIN
            SET @TotalPage=@SumCount/@PageSize
        END
        ELSE
        BEGIN
            SET @TotalPage=Round(@SumCount/@PageSize,0)+1
        END
        Select TOP (@PageSize) Identifier,ParentId,AreaLevel,Children,AreaName,
        Path,Status,Alt,@TotalPage as totalPage,@SumCount as SumCount
        FROM #temp_Area 
        Where 
        Identifier NOT IN (Select Top (@PageSize*(@CurrentPage-1))Identifier FROM #temp_Area))
    END
    ELSE
    BEGIN

        Select Identifier,ParentId,AreaLevel,Children,AreaName,Path,Status,Alt FROM Area Where 
        (@Identifier IS NULL or Identifier=@Identifier)AND
        (@ParentId IS NULL or ParentId=@ParentId)AND
        (@AreaLevel IS NULL or AreaLevel=@AreaLevel)AND
        (@Children IS NULL or Children=@Children)AND
        (@AreaName IS NULL or AreaName Like @AreaName)AND
        (@Path IS NULL or Path Like @Path)AND
        (@Status IS NULL or Status=@Status)AND
        (@Alt IS NULL or Alt=@Alt)
        order by AreaName asc
    END

END

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Tag标签: SQLServer,KiWing,临时表,性能,SQL,实体类,ORM,框架设计

posted @ 2009-03-05 08:14 mikel 阅读(374) 评论(4)  编辑 收藏 网摘 所属分类: 架构设计 、开发手记 、SQLServer 、KiWing

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#1楼 2009-03-05 08:34 | koumi      

２００５有个新方法提高分页效率啊 
ROW_NUMBER()你应该知道的吧． 
虽然我没完全看你写的储存过程分页，但是我感觉ＲＯＷ＿ＮＵＭＢＥＲ（）效率很高！

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#2楼 222.134.67.*2009-03-05 08:39 | zbmwt [未注册用户]

row_number的效率确实是很好。我测试过1千万的数据，感觉效率很好，比select top n的方法还快一点点。另外，关键是写起来语法简便多了。呵呵。

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#3楼 2009-03-05 09:02 | 温景良(Jason)      

呵呵，楼主我觉得那个分页好麻烦啊

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#4楼 [楼主]2009-03-05 09:15 | mikel      

是吗？row_number我没测试过，修改一下试试，谢谢zbmwt