String oldColumnName = myColumnName; myColumnName = (String) _nullIfPrototyped(EOAttribute.COLUMN_NAME, _columnName);
String oldColumnName = getColumnName();  myColumnName = _columnName;
  public void setColumnName(String _columnName) {    String oldColumnName = myColumnName;    myColumnName = (String) _nullIfPrototyped(EOAttribute.COLUMN_NAME, _columnName);    firePropertyChange(EOAttribute.COLUMN_NAME, oldColumnName, getColumnName());  }