Problem with ODynaset::Close()

Question

Hi,
I'm working with OO4O v. 8.1.7.3.11 and MS VC++ 6.0. My application opens multiple dynasets. When the database access is no longer needed it closes the dynasets using the ODynaset::Close method. But when I take a look at my temporary directory I can see that the number of oip... - files increases each time the Open-Methods are called and the oip... files are NOT deleted when I call the close method. Which means that the open cursors are not closed when I call ODynaset::Close(). After some time this leads to a "Maximum number of open cursors exceeded" error.
The cursors will be closed when I call the destructor of ODynaset. But the ODynaset-Objects are members of an other class and I can't call the destructor of ODynaset just to close a cursor.
Did I make a mistake or is it a bug in OO4O ?
Can anybody help me ?
Thanks in advance,
Ilona Hohlefeld

Answer 1

Hi again,
after making some more tests I have some interesting news:
I derive a class from ODynaset as desribed in the OO4O sample projects:
class CDeltaDynaset : public ODynaset
public:
     CDeltaDynaset();
     virtual ~CDeltaDynaset();
public:
     // strings needed for creating the queries
     CString m_strSQLQuery; // the query to be sent to the database
     CString m_strSQLSelect; // the select portion
     CString m_strSQLFilter; // the where portion
     CString m_strSQLSort; // the order by portion
     // Field/Param Data
     OField m_SERIENNUMMER_I;
// Operations
public:
     void OpenQuery(ODatabase theDB);
     void CreateSQLSelect();
     void AddFilter(CString strFilter);
     void ResetToDefaultFilter();
     void RefreshQuery();
void CDeltaDynaset::OpenQuery(ODatabase theDB)
     oresult dbresult;
     // create a query statement
     m_strSQLQuery = m_strSQLSelect;
     if (m_strSQLFilter)
          m_strSQLQuery += m_strSQLFilter;
     if (m_strSQLSort)
          m_strSQLQuery += m_strSQLSort;
     // query the database
     dbresult = Open(theDB, m_strSQLQuery);
     if (dbresult == OFAILURE)
          // processing error message
          AfxMessageBox(theDB.GetErrorText());
     // display the first record from the Customer table
     dbresult = MoveFirst();
     // retreive/store information from the database
     m_SERIENNUMMER_I = GetField("SERIENNUMMER_I");
When I use an instance of this class, call OpenQuery(...) and later call Close() (with result OSUCCESS), the cursor remains open. When I comment out the line "m_SERIENNUMMER_I = GetField("SERIENNUMMER_I");" in the method OpenQuery(...), the call of Close() will really close the cursor.
The problem seems to be the OField-Binding.
What can I do to force the Dynaset close ?
Thanks in advance,
Ilona