分页存储过程

CREATE PROCEDURE CN5135_SP_Pagination

(
@Tables varchar(1000),       --表名称,视图
@PrimaryKey varchar(100),    --主关键字
@Sort varchar(200) = NULL,   --排序语句，不带Order By 比如：NewsID Desc,OrderRows Asc
@CurrentPage int = 1,        --当前页码
@PageSize int = 10,          --分页尺寸
@Fields varchar(1000) = '*', --
@Filter varchar(1000) = NULL,--过滤语句，不带Where
@Group varchar(1000) = NULL  --Group语句,不带Group By
)
AS

/*默认排序*/
IF @Sort IS NULL OR @Sort = ''
 SET @Sort = @PrimaryKey

DECLARE @SortTable varchar(100)
DECLARE @SortName varchar(100)
DECLARE @strSortColumn varchar(200)
DECLARE @operator char(2)
DECLARE @type varchar(100)
DECLARE @prec int

/*设定排序语句.*/ 
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)

/*默认当前页*/
IF @CurrentPage < 1
 SET @CurrentPage = 1

/*设置分页参数.*/
SET @strPageSize = CAST(@PageSize AS varchar(50))
SET @strStartRow = CAST(((@CurrentPage - 1)*@PageSize + 1) AS varchar(50))

/*筛选以及分组语句.*/
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 = ''
 
/*执行查询语句*/ 
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