SOS:HIBERNATE，查询不了结果！！！！

Question

this.usernameDAO.findById("AAA1");你的方法怎么实现的，byId为何输入name做参数？

Answer 1

Username name=this.usernameDAO.findById("AAA1");
System.out.println(name.getDepartment());上面那句话是不是放在你的usernameDaoHibernate类中呢,然后你的配置文件又如何配的呢,贴出来吧

Answer 2

public class UsernameDAO extends HibernateDaoSupport {    private static final Log log = LogFactory.getLog(UsernameDAO.class); protected void initDao() {
//do nothing
}
    
    public void save(Username transientInstance) {
        log.debug("saving Username instance");
        try {
            getHibernateTemplate().saveOrUpdate(transientInstance);
            log.debug("save successful");
        } catch (RuntimeException re) {
            log.error("save failed", re);
            throw re;
        }
    }
    
public void delete(Username persistentInstance) {
        log.debug("deleting Username instance");
        try {
            getHibernateTemplate().delete(persistentInstance);
            log.debug("delete successful");
        } catch (RuntimeException re) {
            log.error("delete failed", re);
            throw re;
        }
    }
    
    public Username findById( java.lang.String id) {
        log.debug("getting Username instance with id: " + id);
        try {
            Username instance = (Username) getHibernateTemplate()
                    .get("com.shenzhenair.medet.bo.users.Username", id);
            return instance;
        } catch (RuntimeException re) {
            log.error("get failed", re);
            throw re;
        }
    }
    
    
    public List findByExample(Username instance) {
        log.debug("finding Username instance by example");
        try {
            List results = getSession()
                    .createCriteria("com.shenzhenair.medet.bo.users.Username")
                    .add(Example.create(instance))
            .list();
            log.debug("find by example successful, result size: " + results.size());
            return results;
        } catch (RuntimeException re) {
            log.error("find by example failed", re);
            throw re;
        }
    }    
    
    public Username merge(Username detachedInstance) {
        log.debug("merging Username instance");
        try {
            Username result = (Username) getHibernateTemplate()
                    .merge(detachedInstance);
            log.debug("merge successful");
            return result;
        } catch (RuntimeException re) {
            log.error("merge failed", re);
            throw re;
        }
    }    public void attachDirty(Username instance) {
        log.debug("attaching dirty Username instance");
        try {
            getHibernateTemplate().saveOrUpdate(instance);
            log.debug("attach successful");
        } catch (RuntimeException re) {
            log.error("attach failed", re);
            throw re;
        }
    }
    
    public void attachClean(Username instance) {
        log.debug("attaching clean Username instance");
        try {
            getHibernateTemplate().lock(instance, LockMode.NONE);
            log.debug("attach successful");
        } catch (RuntimeException re) {
            log.error("attach failed", re);
            throw re;
        }
    } public static UsernameDAO getFromApplicationContext(ApplicationContext ctx) {
     return (UsernameDAO) ctx.getBean("UsernameDAO");
}
}

Answer 3

我的方法是这样写的,看你的也差不多,只有检查配置那块儿的问题了,然后放在IDE中单步调试,查看变量的变化情况吧
 public User getUser(Long id) {
        User user = (User) getHibernateTemplate().get(User.class, id);
        if (user == null) {
            throw new ObjectRetrievalFailureException(User.class, id);
        }
        return user;
    }   

Answer 4

我已经DEBUG了，就是没有找到问题所在，很怪！