Re: Find out how many records in a SQL Table

From:
Hector Santos <sant9442@nospam.gmail.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Thu, 04 Feb 2010 05:13:15 -0500
Message-ID:
<OQJxoKYpKHA.3792@TK2MSFTNGP06.phx.gbl>
Use GetFieldValue(), not GetRecordCount(). That will return 1 always.

Andreas Warning wrote:

here my code. It shows always a result auf 1.

What do I wrong

 // Create a Action Log Object
  m_pActLog=new CActionLog(g_bSQLServer);
  m_pActLog->SetTableName(_T("[ActionLog]"));
  TRY
  {

      m_pActLog->Open( CRecordset::dynaset,_T("Select count(*) from
ActionLog"));

     long zz = m_pActLog->GetRecordCount();

  }
  CATCH(CDBException, e)
  {
    CString error = CString("ERROR: ") + e->m_strError + CString("\nODBC: ")
+ e->m_strStateNativeOrigin;
 AfxMessageBox(error);
 delete m_pActLog;
 AfxMessageBox(_T("ActionLog Table not ok Terminated Program"));
 exit(0);
  }
  END_CATCH
"Goran" <goran.pusic@gmail.com> schrieb im Newsbeitrag
news:de01d86e-4efb-4f07-8f9c-4769c1e3b31d@q16g2000yqq.googlegroups.com...
On Feb 3, 4:46 pm, "Andreas Warning" <and...@gmx.net> wrote:

Hello,

how can I find out how many records are in a SQL Table.

I used MFC Recordsets

Do you have an idea ?


+1 for "don't use GetRecordCount()". As Hector says, under the hood,
things are not supposed to work that way with all databases (recordset
record count is not known up-front). SELECT COUNT(*) FROM X is better.

Note, however, that result is purely informational. For example
(depending on your situation), you should not be using said count+1 as
next record key, due to concurrency issues. If all you want is e.g.
"processing X of Y records", then it's OK.

Goran.


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