docs: private static DatabaseFieldConfig buildConfig(DatabaseField databaseField, String tableName, Field field)
  			throws Exception {
  		InvocationHandler proxy = Proxy.getInvocationHandler(databaseField);
  		if (proxy.getClass() != annotationFactoryClazz) {
  			return null;
  		}
  		// this should be an array of AnnotationMember objects
  		Object elementsObject = elementsField.get(proxy);
  		if (elementsObject == null) {
  			return null;
  		}
  		DatabaseFieldConfig config = new DatabaseFieldConfig(field.getName());
  		Object[] objs = (Object[]) elementsObject;
  		for (int i = 0; i < configFieldNums.length; i++) {
  			Object value = valueField.get(objs[i]);
  			if (value != null) {
  				assignConfigField(configFieldNums[i], config, field, value);
  			}
  		}
  		return config;
  	}