public String getAnnotationPrimaryNameByField(Class<?> entity) {
		String primaryName = "";
		Field[] fields = entity.getDeclaredFields();

		for (Field field : fields) {
			if (field.isAnnotationPresent(PrimaryKeysAnnotation.class)) {
				// System.out.println(field.getName());
				PrimaryKeysAnnotation primary = field
						.getAnnotation(PrimaryKeysAnnotation.class);
				primaryName += primary.column() + ",";

			}
		}
		// System.out.println(primaryName.substring(0,
		// primaryName.lastIndexOf(',')));
		if (primaryName == null || primaryName.equals("")) {
			return primaryName;
		} else {
			return primaryName.substring(0, primaryName.lastIndexOf(','));
		}
	}