a puzzle about DB in the vc

[jolley]

in order to make things clearer .i give a part of code (the codes functions as to connect the data base and execute the SQL statement ):

  try
{
   CDatabase cdb;
   CRecordset recset(&cdb);
  cdb.open();
  CString strQuery="select * from Customer";
  recset.open(CRecordset::forwordOnly,strQuery);
  cdb.close()
}
catch(CDBException& e)
{
    CString errorMessage;
    errorMessage.Format("ODBC=%d%s",e.m_strerror/*sorry there maybe a mistake*/) ;
AfxMessageBox("the data file can not be executed because of this error"); 
}

BUT at first used this way of executing SQL statement .i am content with the following

 CDatabase cdb;
  CString strQuery="select * from Customer";
  cdb.ExecuteSQL(strQuery);

I get something from people telling that using ExecuteSQL will damage the ODBC non-dependence ,so i choose the first version and i am also contented that i have added exceptions to the database.
however ,what i have done doesnot change the fate----no result and it doesnot allow my loggining ,and now i try .....
yeah i hope that i can get some helps from u ,ok?
much appreciation !
jolley
Regards.