/*
數據庫分頁存儲過程，支持倒序和升序
參數說明：
  @tablename：為搜索表名
  @tablefield：為表的字段，約定為表的主鍵,
  @where：為搜索表名，要顯示所有記錄請設為"1=1"
  @orderby：為搜索結果排序，如order by id desc
  @fieldlist：為字段列表，如userid, username
  @curpage：當前頁碼
  @page_record：每頁記錄條數
  @Sort：排序標識（如果是倒序排，參數值為desc，為升序，參數值為asc，跟orderby參數是對應的）
結果： 返回表tablename中滿足條件where的第curpage頁的page_record條記錄，結果按orderby排序
*/
CREATE PROCEDURE proc_CommonPaging

@tablename varchar(100),
@tablefield varchar(20),
@where varchar(5000),
@orderby varchar(500),
@fieldlist varchar(1000),
@curpage int,
@page_record int,
@sort varchar(8)

AS

BEGIN

  DECLARE @cmd varchar(8000)
  DECLARE @uprecord int
  DECLARE @Op varchar(2) -- 操作符
  DECLARE @max_min varchar(4) -- 最大/最小計算

  SET @op = '<'
  SET @max_min = 'MIN'
  IF @sort = 'asc'
      BEGIN
    SET @Op = '>'
            SET @max_min = 'MAX'
      END

  SET @uprecord=@curpage * @page_record
 
  IF @curpage = 0
      SET @cmd = 'SELECT TOP '+cast(@page_record AS NVARCHAR)+' '+@fieldlist+' FROM '+@tablename+' WHERE '+@where+' '+@orderby
  ELSE
    SET @cmd = 'SELECT TOP '+cast(@page_record AS NVARCHAR)+' '+@fieldlist+' FROM '+@tablename+' WHERE '+@where+' AND '+@tablefield+'
    '+@op+' (SELECT '+@max_min+'('+@tablefield+')  FROM (SELECT TOP  '+cast(@uprecord AS NVARCHAR)+' '+@tablefield+' FROM '+@tablename+' WHERE
    '+@where+' '+@orderby+') AS TmpTbl ) AND '+@where+' '+@orderby

  SET @cmd = @cmd + '; SELECT COUNT(*) FROM '+@tablename+' WHERE '+@where

  EXEC(@cmd)
  PRINT(@cmd)

END
GO