/**
  * INTERNAL: Execute the query building the objects directly from the database result-set.
  *
  * @exception DatabaseException - an error has occurred on the database
  * @return object - the first object found or null if none.
  */
 protected Object executeObjectLevelReadQueryFromResultSet() throws DatabaseException {
   UnitOfWorkImpl unitOfWork = (UnitOfWorkImpl) getSession();
   DatabaseAccessor accessor = (DatabaseAccessor) unitOfWork.getAccessor();
   DatabasePlatform platform = accessor.getPlatform();
   DatabaseCall call = (DatabaseCall) getCall().clone();
   call.setQuery(this);
   call.translate(this.translationRow, null, unitOfWork);
   Statement statement = null;
   ResultSet resultSet = null;
   boolean exceptionOccured = false;
   try {
     accessor.incrementCallCount(unitOfWork);
     statement = call.prepareStatement(accessor, this.translationRow, unitOfWork);
     resultSet = accessor.executeSelect(call, statement, unitOfWork);
     ResultSetMetaData metaData = resultSet.getMetaData();
     Vector results = new Vector();
     ObjectBuilder builder = this.descriptor.getObjectBuilder();
     while (resultSet.next()) {
       results.add(
           builder.buildWorkingCopyCloneFromResultSet(
               this,
               this.joinedAttributeManager,
               resultSet,
               unitOfWork,
               accessor,
               metaData,
               platform));
     }
     return results;
   } catch (SQLException exception) {
     exceptionOccured = true;
     DatabaseException commException =
         accessor.processExceptionForCommError(session, exception, call);
     if (commException != null) throw commException;
     throw DatabaseException.sqlException(exception, call, accessor, unitOfWork, false);
   } finally {
     try {
       if (resultSet != null) {
         resultSet.close();
       }
       if (statement != null) {
         accessor.releaseStatement(statement, call.getSQLString(), call, unitOfWork);
       }
     } catch (SQLException exception) {
       if (!exceptionOccured) {
         // in the case of an external connection pool the connection may be null after the
         // statement release
         // if it is null we will be unable to check the connection for a comm error and
         // therefore must return as if it was not a comm error.
         DatabaseException commException =
             accessor.processExceptionForCommError(session, exception, call);
         if (commException != null) throw commException;
         throw DatabaseException.sqlException(exception, call, accessor, session, false);
       }
     }
   }
 }