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木屑遺作端数不承不承呪術溜まり場減収
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1/29/2014 4:17:00 PM
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1 Answer
Cowboy
4/2/2008 1:03:00 PM
0
If this were merely a pure rounding issue, you can set up comparison to only
look at so many points to the right of the decimal, but there is something
more insidious here. And I am not sure, right now, how to solve it.
Not sure why it does not happen in VB6, but COM does handle things a bit
differently. Somewhere along the way, there is a conversion to floating
point. That is where I would look for the solution. Since Access is COM
based, you cannot easily debug this one, which would be my other suggestion.
There is likely a flip in one of the queries.
And, I am not going to beat you up for it being a text field. We all carry
garbage that we shouldn't have to as we work on applications. :-)
--
Gregory A. Beamer
MVP, MCP: +I, SE, SD, DBA
Subscribe to my blog
http://gregorybeamer.spaces...
list...
or just read it:
http://gregorybeamer.spaces...
*************************************************
| Think outside the box!
|
*************************************************
"fniles" <fniles@pfmail.com> wrote in message
news:eScf2BRkIHA.4684@TK2MSFTNGP06.phx.gbl...
> The query is very complicated, it refers to another query, who refers to
> another query, who refers to another query.
> But the original table's column where Profit comes from is of type "text"
> field of 50 character length (I know, I know, why is it a text field ? It
> was like that from the beginning, and I changed it when we convert to SQL
> Server, but the original Access database is a text field :( .... )
> Is there anything that I can do to fix this data discrepancy issue ?
> BTW, this problem does not happen in a VB6 program
>
> Thank you.
>
> "Cowboy (Gregory A. Beamer)" <NoSpamMgbworld@comcast.netNoSpamM> wrote in
> message news:unLQjSPkIHA.5956@TK2MSFTNGP03.phx.gbl...
>> floating point numbers are notorious for being off. This can happen even
>> when you do not use two different programs (.NET versus Access).
>>
>> Not sure why things are so far off, however. What is the data type in
>> Access?
>>
>> --
>> Gregory A. Beamer
>> MVP, MCP: +I, SE, SD, DBA
>>
>> Subscribe to my blog
>>
http://gregorybeamer.spaces...
list...
>>
>> or just read it:
>>
http://gregorybeamer.spaces...
>>
>> *************************************************
>> | Think outside the box! |
>> *************************************************
>> "fniles" <fniles@pfmail.com> wrote in message
>> news:%230JvyDPkIHA.5820@TK2MSFTNGP04.phx.gbl...
>>>I am using MS Access and VB .NET 2005 (the same problem happens in VB.NET
>>>2008).
>>> I am reading from a query using DataReader (the same problem happens if
>>> I use OLEDBDataAdapter).
>>> When I run the query in Access, the value for Cash = 830.004999999999,
>>> SC = 1692.5 and Profit = -862.495000000001.
>>> Cash = SC + Profit.
>>> But when I read the value from the program, this is what I got:
>>> Cash = 830.000000000489
>>> SC = 1692.5
>>> Profit = -862.499999999511.
>>> Why this difference and how can I fix it ?
>>> Thank you.
>>>
>>> Here are the codes:
>>> Dim m_cmd As OleDb.OleDbCommand
>>> Dim m_dr As OleDb.OleDbDataReader
>>> Dim sSQL As String
>>> m_cmd = New OleDb.OleDbCommand
>>> With m_cmd
>>> .Connection = adoConOLE
>>> .CommandText = "select Cash,Profit from myQuery where Account
>>> = '123'"
>>> End With
>>> m_dr = m_cmd.ExecuteReader()
>>> If m_dr.Read Then
>>> sSQL = sSQL & " " & m_dr.Item("Cash") --> this returns
>>> 830.000000000489 instead of 830.004999999999 when I run it from Access
>>> sSQL = sSQL & " " & m_dr.Item("SC") --> this returns 1692.5,
>>> which is the same as when I run it on Access
>>> sSQL = sSQL & " " & m_dr.Item("Profit") --> this
>>> returns -862.499999999511 instead of -862.495000000001 when I run it
>>> from Access
>>> End If
>>>
>>>
>>
>>
>
>
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