SQL动态计算出表中公式示例

需求贴：http://topic.csdn.net/u/20100513/16/8f29d352-d946-47e8-9d0c-0bc1c7e8db0a.html?013311098457492643

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-- Author : htl258(Tony)
-- Date : 2010-05-13 20:51:15
-- Version: Microsoft SQL Server 2008 (RTM) - 10.0.1600.22 (Intel X86)
-- Jul 9 2008 14:43:34
-- Copyright (c) 1988-2008 Microsoft Corporation
-- Developer Edition on Windows NT 5.1 <X86> (Build 2600: Service Pack 2)
-- Blog : http://blog.csdn.net/htl258

-- Subject:SQL动态计算出表中公式示例
----------------------------------------------------------------------------------

--> 生成测试数据表: [tb]
IF OBJECT_ID('[tb]') IS NOT NULL
DROP TABLE [tb]
GO
CREATE TABLE [tb] ([fitemid] [int],[FID_V] [nvarchar](10),[FName] [nvarchar](10),[FValue] [numeric](14,10),[FExpression] [nvarchar](30))
INSERT INTO [tb]
SELECT '8903','HBase','红本价','740.0000000000','HBase' UNION ALL
SELECT '8905','HBase','红本价','917.0000000000','HBase' UNION ALL
SELECT '8929','T1003','1KV','.0000000000','HBase+T1003+T1005' UNION ALL
SELECT '8929','T1005','1000欧姆','.0000000000','HBase+T1003+T1005' UNION ALL
SELECT '8929','HBase','红本价','200.0000000000','HBase+T1003+T1005' UNION ALL
SELECT '8931','HBase','红本价','288.0000000000','HBase+T1003+T1005' UNION ALL
SELECT '8931','T1005','1000欧姆','.0000000000','HBase+T1003+T1005' UNION ALL
SELECT '8931','T1003','1KV','.0000000000','HBase+T1003+T1005' UNION ALL
SELECT '8933','HBase','红本价','450.0000000000','HBase' UNION ALL
SELECT '8935','HBase','红本价','600.0000000000','HBase' UNION ALL
SELECT '9015','HBase','红本价','740.0000000000','(HBase+T1003+T1006)*T1009' UNION ALL
SELECT '9015','T1003','1KV','.0000000000','(HBase+T1003+T1006)*T1009' UNION ALL
SELECT '9015','T1006','100欧姆','.0000000000','(HBase+T1003+T1006)*T1009' UNION ALL
SELECT '9015','T1009','红绿色','11.0000000000','(HBase+T1003+T1006)*T1009' UNION ALL
SELECT '9017','T1009','红绿色','11.0000000000','HBase' UNION ALL
SELECT '9017','T1005','1000欧姆','.0000000000','HBase' UNION ALL
SELECT '9017','T1003','1KV','.0000000000','HBase' UNION ALL
SELECT '9017','HBase','红本价','965.0000000000','HBase' UNION ALL
SELECT '9019','HBase','红本价','1270.0000000000','HBase' UNION ALL
SELECT '9021','HBase','红本价','1790.0000000000','HBase' UNION ALL
SELECT '9029','HBase','红本价','200.0000000000','HBase' UNION ALL
SELECT '9031','HBase','红本价','288.0000000000','HBase'

SELECT * FROM [tb]

-->SQL查询如下:
--1.开启Ole Automation Procedures对象支持

sp_configure 'show advanced options',1
reconfigure
go
sp_configure 'Ole Automation Procedures',1
reconfigure
go

if object_id('f_calctotable') is not null
drop function [dbo].[f_calctotable]
GO
/*--计算给定算术表达式(公式)的值
计算给定算术表达式的值
此方法由VB版hhjjhjhj(大头)
提供的VB处理程序程序上改造而来
--邹建2004.07(引用请注明此信息)--*/
/*--调用示例
select dbo.f_calc('123+456')
--*/

create function f_calctotable(
@fitemid int,
@str nvarchar(1000) --要计算的表达式
)returns decimal(18,2)
as
begin
select @str=replace(@str,[FID_V],[FValue]) from tb where fitemid=@fitemid
declare @re decimal(18,2)
declare @err int,@src varchar(255),@desc varchar(255)
declare @obj int
exec @err=sp_oacreate 'MSScriptControl.ScriptControl',@obj out
if @err<>0 goto lb_err
exec @err=sp_oasetproperty @obj,'Language','vbscript'
if @err<>0 goto lb_err
exec @err=sp_oamethod @obj,'Eval',@re out,@str
if @err=0 return(@re)
lb_err:
exec sp_oageterrorinfo NULL, @src out, @desc out
declare @errb varbinary(4),@s varchar(20)
set @errb=cast(@err as varbinary(4))
exec master..xp_varbintohexstr @errb,@s out
return('错误号: '+@s+char(13)+'错误源: '+@src+char(13)+'错误描述: '+@desc)
end
go
select *,dbo.f_calctotable(fitemid,FExpression) fsumvalue from tb
/*
fitemid FID_V FName FValue FExpression fsumvalue
----------- ---------- ---------- --------------------------------------- ------------------------------ ---------------------------------------
8903 HBase 红本价 740.0000000000 HBase 740.00
8905 HBase 红本价 917.0000000000 HBase 917.00
8929 T1003 1KV 0.0000000000 HBase+T1003+T1005 200.00
8929 T1005 1000欧姆 0.0000000000 HBase+T1003+T1005 200.00
8929 HBase 红本价 200.0000000000 HBase+T1003+T1005 200.00
8931 HBase 红本价 288.0000000000 HBase+T1003+T1005 288.00
8931 T1005 1000欧姆 0.0000000000 HBase+T1003+T1005 288.00
8931 T1003 1KV 0.0000000000 HBase+T1003+T1005 288.00
8933 HBase 红本价 450.0000000000 HBase 450.00
8935 HBase 红本价 600.0000000000 HBase 600.00
9015 HBase 红本价 740.0000000000 (HBase+T1003+T1006)*T1009 8140.00
9015 T1003 1KV 0.0000000000 (HBase+T1003+T1006)*T1009 8140.00
9015 T1006 100欧姆 0.0000000000 (HBase+T1003+T1006)*T1009 8140.00
9015 T1009 红绿色 11.0000000000 (HBase+T1003+T1006)*T1009 8140.00
9017 T1009 红绿色 11.0000000000 HBase 965.00
9017 T1005 1000欧姆 0.0000000000 HBase 965.00
9017 T1003 1KV 0.0000000000 HBase 965.00
9017 HBase 红本价 965.0000000000 HBase 965.00
9019 HBase 红本价 1270.0000000000 HBase 1270.00
9021 HBase 红本价 1790.0000000000 HBase 1790.00
9029 HBase 红本价 200.0000000000 HBase 200.00
9031 HBase 红本价 288.0000000000 HBase 288.00

(22 行受影响)
*/

--邹老大写的原函数：

/*--计算给定算术表达式(公式)的值
计算给定算术表达式的值
此方法由VB版hhjjhjhj(大头)
提供的VB处理程序程序上改造而来
--邹建2004.07(引用请注明此信息)--*/
/*--调用示例
select dbo.f_calc('123+456')
--*/

if object_id('f_calc') is not null
drop function [dbo].[f_calc]
GO
create function f_calc(
@str nvarchar(1000) --要计算的表达式
)returns sql_variant
as
begin
declare @re sql_variant
declare @err int,@src varchar(255),@desc varchar(255)
declare @obj int
exec @err=sp_oacreate 'MSScriptControl.ScriptControl',@obj out
if @err<>0 goto lb_err
exec @err=sp_oasetproperty @obj,'Language','vbscript'
if @err<>0 goto lb_err
exec @err=sp_oamethod @obj,'Eval',@re out,@str
if @err=0 return(@re)
lb_err:
exec sp_oageterrorinfo NULL, @src out, @desc out
declare @errb varbinary(4),@s varchar(20)
set @errb=cast(@err as varbinary(4))
exec master..xp_varbintohexstr @errb,@s out
return('错误号: '+@s+char(13)+'错误源: '+@src+char(13)+'错误描述: '+@desc)
end
go



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