在Entity类中使用命名查询的最佳做法是什么？

Question

我在使用注释的Hibernate实体类中使用命名查询。
如果每个实体类有多个查询，我应该遵循哪些最佳实践？

Note: We have ruled the idea of putting queries in any property file or hbm.xml file 

Answer 1

@Entity 
@NamedQueries({@NamedQuery(name = User.byUsername, query = "select u from User u where u.username = :username"), 
     @NamedQuery(name = User.follows, query = "select u from Follow as f inner join f.following as u where f.user = :user")}) 
public final class User extends Base implements UserDetails { 

    static public final String byUsername = "User.byUsername"; 
    static public final String follows = "User.follows"; 
... 
} 

之后就可以引用User.byUsername等其他地方，所以只有一个字符串参考。你可以获得所有预测intellitext的好处。像下面这样：

Session session = sessionFactory.getCurrentSession(); 
Query query = session.getNamedQuery(User.follows);