用存储过程来写分页功能

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

-- =============================================
-- Author:  grace
-- Create date: 2009-12-5
-- Description: 分页过程
-- =============================================
ALTER  PROCEDURE [dbo].[Pagination]
(
@Tables varchar(1000),
@PK varchar(100),
@Sort varchar(200) = NULL,
@isAscending bit=1,
@PageNumber int = 1,
@PageSize int = 10,
@Fields varchar(1000) = '*',
@Filter varchar(1000) = NULL,
@Group varchar(1000) = NULL,
@totalcounts int output
)
AS

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

set @totalcounts=0;

/*Find the @SORT type*/
DECLARE @strFilter varchar(1000)
DECLARE @strSimpleFilter varchar(1000)
DECLARE @strGroup varchar(1000)

DECLARE @SortTable varchar(100)
DECLARE @SortName varchar(100)
DECLARE @strPKColumn varchar(200)
DECLARE @strSortColumn varchar(200)
DECLARE @operator char(2)

/*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
begin
 SET @strGroup = ' '
end

/*记录数*/
declare @sqlStr nvarchar(1000)
set @sqlStr = N'select  @totalcounts=count(*) from ' + @Tables + ' ' + @strFilter
EXEC sp_executesql @sqlStr,N'@totalcounts int OUTPUT', @totalcounts OUTPUT

/*Set sorting variables.*/
SET @strSortColumn =@Sort

/*operator and asc_desc*/
declare @strAsc_Des varchar(10)
IF @isAscending = 0
 BEGIN
 
  SET @operator = '<='
  SET @strAsc_Des = ' Desc '
 END
ELSE
 BEGIN
  SET @operator = '>='
  SET @strAsc_Des = ' ASC '
 END
IF CHARINDEX('.', @PK) > 0
 BEGIN
  SET @strPKColumn = SUBSTRING(@PK, 0, CHARINDEX('.',@PK)) 
 END
ELSE
 BEGIN
  SET @strPKColumn = @PK 
 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

/*Handler complex table*/
--Be join table,so get the left table
IF CHARINDEX(' join ',@Tables) > 0
BEGIN
SET @SortTable=SUBSTRING(ltrim(@Tables),0,CHARINDEX(' ',@Tables))
SET @strSortColumn = @SortTable+'.'+@SortName
END

/*Check the sortColumn if be Unique*/
DECLARE @tempName varchar(100)
IF @SortName <> @strPKColumn
begin
SELECT @tempName=b.name
FROM sysobjects a INNER JOIN
      sysobjects b ON a.id = b.parent_obj
    INNER JOIN sysindexes c ON b.name = c.name INNER JOIN
      sysindexkeys d ON c.id = d.id AND c.indid = d.indid INNER JOIN
      syscolumns e ON d.id = e.id AND d.colid = e.colid
WHERE (b.xtype = 'UQ') AND (a.name = @SortTable) AND (e.name = @SortName)

IF @tempName IS NULL GOTO Paging_Not_In
end

DECLARE @type varchar(100)
DECLARE @prec int

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

/*The left table doesn't contain sortcolumn */
--IF  @type is null or @type=''  Goto:Paging_Not_In

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

DECLARE @strPageSize varchar(50)
DECLARE @strStartRow varchar(50)

/*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))
 
/*Execute dynamic query*/

EXEC( 'DECLARE @SortColumn ' + @type + '
SET ROWCOUNT ' + @strStartRow +
 'SELECT @SortColumn=' + @strSortColumn + ' FROM ' + @Tables + @strFilter + ' ' + @strGroup +
 ' ORDER BY ' + @Sort + @strAsc_Des+' SET ROWCOUNT ' + @strPageSize +
 'SELECT ' + @Fields + ' FROM ' + @Tables + ' WHERE ' + @strSortColumn + @operator + ' @SortColumn ' +
 @strSimpleFilter + ' ' + @strGroup + ' ORDER BY ' + @Sort + @strAsc_Des
)
return

Paging_Not_In:
--DECLARE @strPageSize varchar(50)
--SET @strPageSize = CAST(@PageSize AS varchar(50))
declare @strTotalNum int

SET @strTotalNum = (@PageNumber - 1)*@PageSize

--第一页
--Declare @strSQL varchar(8000)
IF  @strTotalNum = 0
begin

exec('select top '+@PageSize+' '+@Fields+' from '+@Tables+' '+@strFilter+ @strGroup + ' ORDER BY ' + @Sort + @strAsc_Des) 
end
else
begin
 exec('select top '+@PageSize+' '+@Fields+' from '+@Tables+'  where '
+@PK+' not in(select top '
+@strTotalNum+' '+@PK+' from '+@Tables+' '+@strFilter+ @strGroup +
 ' ORDER BY ' + @Sort + @strAsc_Des
+') '+@strSimpleFilter+ @strGroup + ' ORDER BY ' + @Sort + @strAsc_Des)
end

return;