code: public static String getTableName(Class<? extends Entity> cls) {
  		String name = TABLE_NAMES.get(cls);
  		if (name == null) {
  			TableAnn ann = getTableAnn(cls);
  			if (ann != null) {
  				name = ann.name;
  			}
  			if (isEmpty(name)) {
  				name = cls.getSimpleName();
  			}
  			TABLE_NAMES.put(cls, name);
  		}
  		return name;
  	}
docs: SQL