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Using CDaoRecordSet::Requery to refresh records

Posted on 2000-04-02
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Last Modified: 2013-11-20
Hi... I'm getting Recordsets by using a SQL statement in the CDaoRecordset::Open method.... my question is, if I need another SQL statement, is there a way to refresh the records without Closing the recordset and then Opening it again?

Thanks
Skel
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Question by:skel
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by:inpras
ID: 2678832
     CDaoDatabase db;
      db.Open("c:\\Temp\\MyDB.mdb", FALSE, FALSE, _T(""));
      CDaoRecordset rs(&db);
      rs.Open(AFX_DAO_USE_DEFAULT_TYPE, "Select * from MyTab", 0);

      db.Execute("UPDATE MyTab SET MyName = 'ABCD'", 0);
      rs.Requery();
??
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Author Comment

by:skel
ID: 2678843
No.... Execute doesn'r return any records.. I meant using SELECT statement

Skel
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Expert Comment

by:_mb_
ID: 2679177
If the recordset is opened, you can't change the SELECT statement. The only way is to change the member variables m_strFilter and/or m_strSort to create new requery-conditions before you call the requery-method.
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Expert Comment

by:z2000
ID: 2679236
If you need another SQL you must close and reopen because recordset is a set of record which you selected ->if not close (to empty buffer)old data and new data is conflicted ). In case use m_strFilter& m_strSort you have to use requery function but that function call Close and Open function (if you debug into Requery you'll see)
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inpras earned 50 total points
ID: 2679355
Wel even if execute will not reurn recordset for U I think since it updates table in UR database requery should work. see what I have done for small example

      CDaoDatabase db;
      db.Open("c:\\Temp\\MyDB.mdb", FALSE, FALSE, _T(""));
      CDaoRecordset rs(&db);
      rs.Open(AFX_DAO_USE_DEFAULT_TYPE, "Select * from MyTab", 0);

      db.Execute("UPDATE MyTab SET Name = 'ABCD'", 0);
      rs.Requery();
      rs.MoveLast();
      CString strNo;
      strNo.Format("%d", rs.GetRecordCount());
      AfxMessageBox(strNo);
      db.Execute("INSERT INTO MyTab VALUES('ABCD')", 0);
      rs.Requery();
      rs.MoveLast();
      strNo.Format("%d", rs.GetRecordCount());
      AfxMessageBox(strNo);

Hope this helps
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