/*
数据库分页存储过程，支持倒序和升序
参数说明：
@tablename：为搜索表名
@tablefield：为表的字段，约定为表的主键,
@where：为搜索表名，要显示所有记录请设为"1=1"
@orderby：为搜索结果排序，如order by id desc
@fieldlist：为字段列表，如userid, username
@curpage：当前页码
@page_record：每页记录条数
@Sort：排序标识（如果是倒序排，参数值为desc，为升序，参数值为asc，跟orderby参数是对应的）
结果： 返回表tablename中满足条件where的第curpage页的page_record条记录，结果按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/最小计算
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
