code: @Override
     protected int deleteReference(String propertyCid) throws SQLException
     {
        if (deleteReference == null)
        {
           deleteReference = dbConnection.prepareStatement(DELETE_REF);
        }
        else
        {
           deleteReference.clearParameters();
        }
  
        deleteReference.setString(1, propertyCid);
        return deleteReference.executeUpdate();
     }
docs: {@inheritDoc}