## 增 ~~~ //加載數據庫核心配置文件(引入映射文件) Configuration configuration = new Configuration(); configuration.configure(); //獲取sessionFactory工廠,相當于連接池 SessionFactory sessionFactory = configuration.buildSessionFactory(); //獲取session,相當于connection Session session = sessionFactory.openSession(); //開啟事務(hibernate必須要開啟事務) Transaction tx = session.beginTransaction(); //操作 Customer customer = new Customer(); customer.setCust_name("jack"); session.save(customer); //提交事務 tx.commit(); //關閉連接 session.close(); //關閉連接池 sessionFactory.close(); ~~~ ## 刪 先查再刪. ~~~ Customer customer = session.load(Customer.class, 1L); session.delete(customer); ~~~ ## 改 改之前要先查. ~~~ Customer customer = session.get(Customer.class, 1L); customer.setCust_name("米蘭"); session.save(customer); ~~~ ## 查 ### get 1. 方式的SQL語句立刻執行. 2. get查詢返回的是Customer類型. 3. get查詢不到返回null. ### load 1. load方式是等用到查詢的內容的時候才去執行.效率上load更高. 2. load查詢返回的是Customer代理類型. 3. load查詢不到返回報錯信息. ~~~ Customer customer = session.get(Customer.class, 1L); //get方式 Customer customer = session.load(Customer.class, 1L); //load方式 System.out.println(customer); ~~~