code: public <RET> RET save(final Object iContent, OPERATION_MODE iMode, final ORecordCallback<? extends Number> iCallback) {
  		return (RET) save(iContent, null, iMode, iCallback);
  	}
docs: Saves an object to the database specifying the mode. First checks if the object is new or not. In case it's new a new ODocument
  is created and bound to the object, otherwise the ODocument is retrieved and updated. The object is introspected using the Java
  Reflection to extract the field values. <br/>
  If a multi value (array, collection or map of objects) is passed, then each single object is stored separately.