When bulk reading a database column that allows NULL values, you must check for null in the receiving vector object.

To avoid this issue in your program, check each element of the RWDBVector, RWDBDateVector or RWDBStringVector objects mapped to a column in your database the allows NULL values.  An example of this checking can be found in the following code sample.

#code

  RWDBTable mlTable1 = mlResult1.table();
  RWDBBulkReader mlBReader = mlTable1.bulkReader(mlConnection1);

  RWDBVector<int> nNumber (1);
  RWDBStringVector szText (1000, 1);

  mlBReader << nNumber << szText;

  int nRead = 0;
  while (nRead = mlBReader())
  {
   cerr << "Read " << nRead << " record(s)" << endl;;

   for (int i = 0; i < nRead ; i++)
   { 
    cout << " nNumber[" << i << "] = " << nNumber[i]
      << " | szText[" << i << "] = " << (szText.isNull(i) ? "NULL" : szText[i])
       << " | Len " << szText.length() << endl << endl;
    
   }
   }