sqlserver2005利用临时表和@@RowCount提高分页查询存储过程性能示例分享

admin MsSql

2023-12-07 0 263

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：

复制代码代码如下: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=NULLASBEGIN 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 ENDEND

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=NULLASBEGIN 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 ENDEND

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=NULLASBEGIN 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 ENDEND

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