SQL SERVER 2008 存储过程 --跨表查询(例)

SQL SERVER数据库项目中用到了对自动生成的表的查询。

表的命名规律如 T_His20141021 即 T_Hisyyyymmdd

由于这些表都是通过模板T_History表生成的，故自动生成的这些表的字段类型和长度都与表T_History一样。

USE [mydatabase]
GO
/****** Object:  StoredProcedure [dbo].[P_DataSearch]    Script Date: 10/21/2014 15:27:47 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:	<XXX>
-- Create date: <2014-mm-dd>
-- Description:	<查询历史数据信息>
-- =============================================

ALTER PROCEDURE [dbo].[P_GetHistoryDataTable]

-- Add the parameters for the stored procedure here
@inid varchar(10),
@start datetime,

@end datetime

AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
declare @sql varchar(max),
@num int,
@i int

select  @num=datediff(DAY, @start, @end)
--select @num

select number, [date]=convert(char(8), dateadd(DAY, number, @start), 112) into #temp
from
(
select top(datediff(DAY, @start, @end)+1) number
from master..spt_values
where type = 'p'
) T

set @sql='select ins.insname,his.dtime,his.dvalue from T_Intimes ins,T_History his where ins.inid=his.isid and ins.inid='''+@inid+''' '

set @i=0
while  @i<=@num
BEGIN
declare @temday varchar(20)
begin
select @temday=[date] from #temp where number=@i
IF EXISTS  (SELECT  * FROM dbo.SysObjects WHERE ID = object_id(N'T_His'+@temday) AND OBJECTPROPERTY(ID, 'IsTable') = 1)
begin
set @sql+=' union select ins.insname,his.dtime,his.dvalue from T_Intimes ins,T_His'+@temday+' his where ins.inid=his.isid and ins.inid='''+@inid+''' '
end
end
set @i=@i+1
END
set @sql+=' order by dtime'
drop table #temp
-- print @sql

exec (@sql)
END

注：直接创建此存储过程时，需要将代码中的“ALTER ”改为“CREATE”