org.hibernate.hql.ast.QuerySyntaxException:tablename未映射

Question

我面临异常:org.hibernate.hql.ast.QuerySyntaxException:Student6未映射[来自Student6 stud]我的表名是sql server数据库中的Student6,pojo类名是Student.

    public static void main(String[] args) {
    Configuration configuration = new Configuration();
    SessionFactory  sessionFactory = configuration.configure().buildSessionFactory();
    Session session = sessionFactory.openSession();
    try {
        String SQL_QUERY ="from Student6 stud";
             Query query = session.createQuery(SQL_QUERY);
             for(Iterator it=query.iterate();it.hasNext();)             {
             Object[] row = (Object[]) it.next();
             System.out.println("STUDENT_ID: " + row[0]);
             System.out.println("STUDENT_NAME: " + row[1]);
             System.out.println("ADDRESS_STREET: " + row[2]);
             System.out.println("ADDRESS_CITY: " + row[3]);
             System.out.println("ADDRESS_STATE: " + row[4]);
             System.out.println("ADDRESS_ZIPCODE: " + row[5]);                               }

    } catch (HibernateException e) {
        transaction.rollback();
        e.printStackTrace();
    } finally {
        session.close();
    }
}

Answer 1

您的查询不是SQL查询.这是一个HQL查询.因此它不应该使用表名,而应该使用实体类名(from Student而不是from Student6).它不会以Object[]实例的形式返回行,但会返回实体实例.

Hibernate是一个ORM:一个对象关系映射器.我们的想法是使用对象而不是关系数据.您应该重新阅读Hibernate参考手册.