hibernate中调用query.list()而出现的黄色警告线

使用hibernate的时候会用到hql语句查询数据库, 那就一定会用到query.list();这个方法, 那就一定会出现一个长长的黄色的警告线, 不管你想尽什么办法, 总是存在, 虽然说这个黄色的警告并无碍于程序的运行, 但是对于我这样有着强烈强迫症的人来说我看不下去了.

查了一些资料, 找到办法了

原来的

    public List<Object> list(String className) {
        Configuration conf = new Configuration().configure("conf/hibernate.cfg.xml");
        ServiceRegistry serviceReg = new StandardServiceRegistryBuilder().applySettings(conf.getProperties()).build();
        sessionFactory = conf.buildSessionFactory(serviceReg);
        session = sessionFactory.openSession();
        
        String hql = "from "+className+" where yxbz='1'";
        System.out.println(hql);
        Query query = session.createQuery(hql);
        List<Object> list = query.list();
        
        session.close();
        sessionFactory.close();
        return list;
    }

改成这样的:

public List<?> list(String className) {
    Configuration conf = new Configuration().configure("conf/hibernate.cfg.xml");
    ServiceRegistry serviceReg = new StandardServiceRegistryBuilder().applySettings(conf.getProperties()).build();
    sessionFactory = conf.buildSessionFactory(serviceReg);
    session = sessionFactory.openSession();
     
    String hql = "from "+className+" where yxbz='1'";
    System.out.println(hql);
    Query query = session.createQuery(hql);
    List<?> list = query.list();
     
    session.close();
    sessionFactory.close();
    return list;
}

 

原因是query.list();方法返回的是一个List<?>泛型, 而原来每次这样写的时候都写成List<Object>, 所以出现这黄色的警告线, 实际上List<Object>和List<?>是没啥毛线区别的