Hibernate4.3.10开发实例
pm45e
9年前
1、首先还是引入所需要的包
2、然后是配置hibernate.cfg.xml配置文件,连接mysql数据库信息,以及引入其他子模块的映射文件
<hibernate-configuration> <session-factory> <!-- 数据库连接信息 --> <property name="show_sql">true</property> <property name="connection.url">jdbc:mysql://localhost:3306/test</property> <property name="connection.username">root</property> <property name="connection.password">root</property> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <property name="hbm2ddl.auto">update</property> <mapping resource="/hibernateConfig/Login.hbm.xml" /> </session-factory> </hibernate-configuration>
3、编写子模块的映射文件,这里是一个简单的登录信息表,Login.hbm.xml
<hibernate-mapping package="com.demo.model"> <class name="Login" table="login"> <id name="id" column="id"> <generator class="increment"/> </id> <property name="username" column="username" length="20"/> <property name="password" column="password" length="20"/> </class> </hibernate-mapping>
4、编写model层的对象映射javabean,和普通的javabean没有什么大的区别,只是加了一些构造函数,属性和数据库表的字段对应
public class Login { private int id; private String username; private String password; (getter/setter) public Login() { } public Login(int id, String username, String password) { super(); this.id = id; this.username = username; this.password = password; } }
5、编写DAO层,DAO负责底层的数据库的一些操作,这里需要实现一个DAO接口,使得业务逻辑组件依赖DAO接口而不是具体实现类,将系统各组件之间的依赖提升到接口层次,避免类层次直接耦合(假如系统有所改变,只要接口层次没有改变,那么依赖该组件的上层组件也不需要改变,从而提供了良好的复用)
LoginDao接口:
public interface LoginDao { public void saveLogin(Login login); public void deleteLogin(Login login); public void updateLogin(Login login); public Login findLogin(int id); public Login findLogin(String name); }LoginDaoImpl实现类:
public class LoginDaoImpl implements LoginDao { public void deleteLogin(Login login) { HibernateUtil.delete(login); } public Login findLogin(int id) { return (Login) HibernateUtil.findById(Login.class, id); } public Login findLogin(String name) { return (Login) HibernateUtil.findByName(name); } public void saveLogin(Login login) { HibernateUtil.add(login); } public void updateLogin(Login login) { HibernateUtil.update(login); } }
6、编写业务逻辑组件service,DAO已经帮我们实现了数据库的操作,在业务逻辑组件中我们则只需要调用DAO组件并关注于业务逻辑的实现即可
LoginService接口:
public interface LoginService { public void save(Login login); public void delete(Login login); public void update(Login login); public Login findById(int id); public Login findByName(String name); }LoginServiceImpl实现类:
public class LoginServiceImpl implements LoginService { private LoginDao loginDao; public LoginDao getLoginDao() { return loginDao; } public void setLoginDao(LoginDao loginDao) { this.loginDao = loginDao; } public void delete(Login login) { loginDao.deleteLogin(login); } public Login findById(int id) { return loginDao.findLogin(id); } public Login findByName(String name) { return loginDao.findLogin(name); } public void save(Login login) { loginDao.saveLogin(login); } public void update(Login login) { loginDao.updateLogin(login); } }
7、编写获取hibernate的SessionFactory类的工具类,这里编写一个简单的工具类,一般应用是在spring容器里来管理SessionFactory的
public class HibernateUtil { private static SessionFactory sf; static { Configuration cfg = new Configuration(); cfg.configure("hibernateConfig/hibernate.cfg.xml"); sf = cfg.buildSessionFactory(); } public static Session getSession() { return sf.openSession(); } public static void add(Object entity) { Session session = null; Transaction tx = null; try { session = HibernateUtil.getSession(); tx = session.beginTransaction(); session.save(entity); tx.commit(); } catch (HibernateException e) { e.printStackTrace(); throw e; } finally { if (session != null) { session.close(); } } } public static void delete(Object entity) { Session session = null; Transaction tx = null; try { session = HibernateUtil.getSession(); tx = session.beginTransaction(); session.delete(entity); tx.commit(); } catch (HibernateException e) { e.printStackTrace(); throw e; } finally { if (session != null) { session.close(); } } } public static void update(Object entity) { Session session = null; Transaction tx = null; try { session = HibernateUtil.getSession(); tx = session.beginTransaction(); session.update(entity); tx.commit(); } catch (HibernateException e) { e.printStackTrace(); throw e; } finally { if (session != null) { session.close(); } } } public static Object findById(Class clazz, Serializable id) { Session session = null; try { session = HibernateUtil.getSession(); Object ob = session.get(clazz, id); return ob; } catch (HibernateException e) { e.printStackTrace(); throw e; } finally { if (session != null) { session.close(); } } } public static Object findByName(String name) { Session session = null; try { session = HibernateUtil.getSession(); Query query = session.createQuery("from test where name = :name"); query.setParameter("name", name); Object ob = query.uniqueResult(); return ob; } catch (HibernateException e) { e.printStackTrace(); throw e; } finally { if (session != null) { session.close(); } } } }
注意:当hibernate.cfg.xml不放在src下时,在这里设置一下,让应用能找到这个配置文件
Configuration cfg = new Configuration(); cfg.configure("hibernateConfig/hibernate.cfg.xml");
public String execute(){ Login login=new Login(); login.setUsername(getUsername()); login.setPassword(getPassword()); ls.save(login); return SUCCESS; }
9、在spring配置文件中配置一下各个bean,依赖注入一下
<bean id="loginDao" class="com.demo.dao.daoImpl.LoginDaoImpl" /> <bean id="loginService" class="com.demo.service.serviceImpl.LoginServiceImpl"> <property name="loginDao" ref="loginDao" /> </bean> <bean id="registerAction" class="com.demo.action.RegisterAction" scope="prototype"> <property name="ls" ref="loginService" /> </bean>
10、测试
一个简单的注册页面中输入用户名密码,点击注册后保存到数据库中
数据库中保存成功
来自:http://blog.csdn.net/kevinxxw/article/details/47145189