[SQL]SQL Server 2005中利用@@RowCount提高分页查询存储过程性能

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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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