Hibernate的常用模板的使用

野性酷女 2022-02-28 01:46 191阅读 0赞

*  保存操作  
    save(Object obj);
 *  修改操作  
    update(Object obj);
 *  删除操作  
    delete(Object obj);
 *  查询操作
    
     *  查询一个  
        get(Class c,Serializable id);  
        load(Class c,Serializable id);
     *  查询多个  
        List find(String hql,Object… args);  
        List findByCriteria(DetachedCriteria dc);  
        List findByCriteria(DetachedCriteria dc,int firstResult,int maxResults);  
        List findByNamedQuery(String name,Object… args);

实际应用，按照之前SSH整合的基本环境来：

/*
    * 客户管理的Dao层的实现
    * */
    public class CustomerDaoImpl extends HibernateDaoSupport implements CustomerDao {
        @Override
        public void save(Customer customer) {
            System.out.println("dao中的save方法被调用了...");
            this.getHibernateTemplate().save(customer);
        }
    
        @Override
        public void update(Customer customer) {
            this.getHibernateTemplate().update(customer);
        }
    
        @Override
        public void delete(Customer customer) {
            this.getHibernateTemplate().delete(customer);
        }
    
        @Override
        public Customer findById(long cust_id) {
            return this.getHibernateTemplate().get(Customer.class,cust_id);
        }
    
        @Override
        public List<Customer> fingAllByHQL() {
            List<Customer> list = (List<Customer>) this.getHibernateTemplate().find("from Customer");
            return list;
        }
    
        @Override
        public List<Customer> fingAllByQBC() {
            //做分页的时候尽量使用QBC，比较方便
            DetachedCriteria detachedCriteria = DetachedCriteria.forClass(Customer.class);
            List<Customer> list = (List<Customer>) this.getHibernateTemplate().findByCriteria(detachedCriteria);
            return list;
        }
    }