最近發現現有框架的通用查詢存儲過程的性能慢，於是仔細研究了下代碼：
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
