精彩的近乎完美的分页存储过程

CREATE procedure main_table_pwqzc
(@pagesize int,
@pageindex int,
@docount bit,
@this_id)
as
if(@docount=1)
begin
select count(id) from luntan where this_id=@this_id
end
else
begin
declare @indextable table(id int identity(1,1),nid int)
declare @PageLowerBound int
declare @PageUpperBound int
set @PageLowerBound=(@pageindex-1)*@pagesize
set @PageUpperBound=@PageLowerBound+@pagesize
set rowcount @PageUpperBound
insert into @indextable(nid) select id from luntan where this_id=@this_id order by reply_time desc
select a.* from luntan a,@indextable t where a.id=t.nid
and t.id>@PageLowerBound and t.id<=@PageUpperBound order by t.id
end
GO

存储过程会根据传入的参数@docount来确定是不是要返回所有要分页的记录总数
特别是这两行
set rowcount @PageUpperBound
insert into @indextable(nid) select id from luntan where this_id=@this_id order by reply_time desc

真的是妙不可言!!set rowcount @PageUpperBound当记录数达到@PageUpperBound时就会停止处理查询
,select id 只把id列取出放到临时表里,select a.* from luntan a,@indextable t where a.id=t.nid
and t.id>@PageLowerBound and t.id<=@PageUpperBound order by t.id
而这句也只从表中取出所需要的记录,而不是所有的记录,结合起来,极大的提高了效率!!
妙啊,真的妙!!!!

CREATE PROCEDURE Paging_RowCount
(
@Tables varchar(1000),
@PK varchar(100),
@Sort varchar(200) = NULL,
@PageNumber int = 1,
@PageSize int = 10,
@Fields varchar(1000) = @#*@#,
@Filter varchar(1000) = NULL,
@Group varchar(1000) = NULL)
AS

/*Default Sorting*/
IF @Sort IS NULL OR @Sort = @#@#
 SET @Sort = @PK

/*Find the @PK type*/
DECLARE @SortTable varchar(100)
DECLARE @SortName varchar(100)
DECLARE @strSortColumn varchar(200)
DECLARE @operator char(2)
DECLARE @type varchar(100)
DECLARE @prec int

/*Set sorting variables.*/
IF CHARINDEX(@#DESC@#,@Sort)>0
 BEGIN
  SET @strSortColumn = REPLACE(@Sort, @#DESC@#, @#@#)
  SET @operator = @#<=@#
 END
ELSE
 BEGIN
  IF CHARINDEX(@#ASC@#, @Sort) = 0
   SET @strSortColumn = REPLACE(@Sort, @#ASC@#, @#@#)
  SET @operator = @#>=@#
 END

IF CHARINDEX(@#.@#, @strSortColumn) > 0
 BEGIN
  SET @SortTable = SUBSTRING(@strSortColumn, 0, CHARINDEX(@#.@#,@strSortColumn))
  SET @SortName = SUBSTRING(@strSortColumn, CHARINDEX(@#.@#,@strSortColumn) + 1, LEN(@strSortColumn))
 END
ELSE
 BEGIN
  SET @SortTable = @Tables
  SET @SortName = @strSortColumn
 END

SELECT @type=t.name, @prec=c.prec
FROM sysobjects o
JOIN syscolumns c on o.id=c.id
JOIN systypes t on c.xusertype=t.xusertype
WHERE o.name = @SortTable AND c.name = @SortName

IF CHARINDEX(@#char@#, @type) > 0
   SET @type = @type + @#(@# + CAST(@prec AS varchar) + @#)@#

DECLARE @strPageSize varchar(50)
DECLARE @strStartRow varchar(50)
DECLARE @strFilter varchar(1000)
DECLARE @strSimpleFilter varchar(1000)
DECLARE @strGroup varchar(1000)

/*Default Page Number*/
IF @PageNumber < 1
 SET @PageNumber = 1

/*Set paging variables.*/
SET @strPageSize = CAST(@PageSize AS varchar(50))
SET @strStartRow = CAST(((@PageNumber - 1)*@PageSize + 1) AS varchar(50))

/*Set filter & group variables.*/
IF @Filter IS NOT NULL AND @Filter != @#@#
 BEGIN
  SET @strFilter = @# WHERE @# + @Filter + @# @#
  SET @strSimpleFilter = @# AND @# + @Filter + @# @#
 END
ELSE
 BEGIN
  SET @strSimpleFilter = @#@#
  SET @strFilter = @#@#
 END
IF @Group IS NOT NULL AND @Group != @#@#
 SET @strGroup = @# GROUP BY @# + @Group + @# @#
ELSE
 SET @strGroup = @#@#
 
/*Execute dynamic query*/
EXEC(
@#
DECLARE @SortColumn @# + @type + @#
SET ROWCOUNT @# + @strStartRow + @#
SELECT @SortColumn=@# + @strSortColumn + @# FROM @# + @Tables + @strFilter + @# @# + @strGroup + @# ORDER BY @# + @Sort + @#
SET ROWCOUNT @# + @strPageSize + @#
SELECT @# + @Fields + @# FROM @# + @Tables + @# WHERE @# + @strSortColumn + @operator + @# @SortColumn @# + @strSimpleFilter + @# @# + @strGroup + @# ORDER BY @# + @Sort + @#
@#
)
GO

原文转自：http://www.ltesting.net