/*--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
