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

 2009-03-05 10:24:46 来源:WEB开发网   
核心提示: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 in

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

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Tags:SQL Server 利用

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