/*通用分页存储过程*/
USE HotelManagementSystem
GO
IF EXISTS(SELECT * FROM sys.objects WHERE NAME='cndoup_GetPageOfRecords')
  DROP PROCEDURE cndoup_GetPageOfRecords
GO
--创建存储过程
CREATE PROCEDURE cndoup_GetPageOfRecords
  @pageSize int = 20,                                                --分页大小
  @currentPage int ,                                                 --第几页
  @columns varchar(1000) = '*',                            --需要得到的字段
  @tableName varchar(100),                                     --需要查询的表    
  @condition varchar(1000) = '',                         --查询条件, 不用加where关键字
  @ascColumn varchar(100) = '',                            --排序的字段名 (即 order by column asc/desc)
  @bitOrderType bit = 0,                                         --排序的类型 (0为升序,1为降序)
  @pkColumn varchar(50) = ''                                 --主键名称

AS
BEGIN                                                                                    --存储过程开始
  DECLARE @strTemp varchar(300)
  DECLARE @strSql varchar(5000)                            --该存储过程最后执行的语句
  DECLARE @strOrderType varchar(1000)                --排序类型语句 (order by column asc或者order by column desc)

BEGIN
    IF @bitOrderType = 1                --降序
      BEGIN
        SET @strOrderType = ' ORDER BY '+@ascColumn+' DESC'
        SET @strTemp = '<(SELECT min'
      END
    ELSE                  --升序
      BEGIN
        SET @strOrderType = ' ORDER BY '+@ascColumn+' ASC'
        SET @strTemp = '>(SELECT max'
      END

IF @currentPage = 1            --第一页
      BEGIN
        IF @condition != ''
          SET @strSql = 'SELECT TOP '+STR(@pageSize)+' '+@columns+' FROM '+@tableName+
            ' WHERE '+@condition+@strOrderType
        ELSE
          SET @strSql = 'SELECT TOP '+STR(@pageSize)+' '+@columns+' FROM '+@tableName+@strOrderType
      END

ELSE                  -- 其他页
      BEGIN
        IF @condition !=''
          SET @strSql = 'SELECT TOP '+STR(@pageSize)+' '+@columns+' FROM '+@tableName+
          ' WHERE '+@condition+' AND '+@pkColumn+@strTemp+'('+@pkColumn+')'+' FROM (SELECT TOP '+STR((@currentPage-1)*@pageSize)+
          ' '+@pkColumn+' FROM '+@tableName+'where'+@condition+@strOrderType+') AS TabTemp)'+@strOrderType
        ELSE
          SET @strSql = 'SELECT TOP '+STR(@pageSize)+' '+@columns+' FROM '+@tableName+
          ' WHERE '+@pkColumn+@strTemp+'('+@pkColumn+')'+' FROM (SELECT TOP '+STR((@currentPage-1)*@pageSize)+' '+@pkColumn+
          ' FROM '+@tableName+@strOrderType+') AS TabTemp)'+@strOrderType
      END

END
  EXEC (@strSql)
END

--存储过程结束

--分页得到客房信息列表测试
EXEC cndoup_GetPageOfRecords 20,2,'房间号=RoomNum,
            房间状态=(SELECT RoomTypeDes FROM RoomType WHERE RoomTypeID=Room.RoomTypeID),
            房间状态=(SELECT RSDec FROM RoomStatus WHERE RoomStatusID=Room.RoomStatusID),
            床位数=BedNum,
            楼层=Floors,
            描述=RoomDes,
            备注=RoomRemark','Room','','RoomID',0,'RoomID'

--根据房间号得到客房信息测试
EXEC cndoup_GetPageOfRecords 1,1,'房间号=RoomNum,
            房间状态=(SELECT RoomTypeDes FROM RoomType WHERE RoomTypeID=Room.RoomTypeID),
            房间状态=(SELECT RSDec FROM RoomStatus WHERE RoomStatusID=Room.RoomStatusID),
            BedNum,
            Floors,
            RoomDes,
            RoomRemark','Room','RoomNum=304','RoomID',0,'RoomID'

--·  得到客房类型信息列表测试
EXEC cndoup_GetPageOfRecords 10,1,'RoomTypeDes,Price,Area,AddBed,MaxBedNum,BedPrice,HourRoom,HourPrice,Remark','RoomType','','RoomTypeID',0,'RoomTypeID'