【SSH三大框架】Hibernate基础第五篇:利用Hibernate完毕简单的CRUD操作
2023-09-11 14:20:44 时间
这里利用Hibernate操作数据库完毕简单的CRUD操作。
首先,我们须要先写一个javabean:
package cn.itcast.domain; import java.util.Date; public class User { private int id; private String name; private Date birthday; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } }然后呢,写上它的映射文件:User.hbm.xml
<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="cn.itcast.domain"> <class name="User"> <id name="id"> <generator class="native"/> </id> <property name="name" unique="true" /> <property name="birthday" /> </class> </hibernate-mapping>
<?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <property name="connection.driver_class"> com.mysql.jdbc.Driver </property> <property name="connection.url"> jdbc:mysql://localhost:3306/test </property> <property name="connection.username">sa</property> <property name="connection.password">123456</property> <property name="hbm2ddl.auto">update</property> <property name="show_sql">true</property> <property name="dialect"> org.hibernate.dialect.MySQLDialect </property> <mapping resource="cn/itcast/domain/User.hbm.xml" /> </session-factory> </hibernate-configuration>
首先。我们得实现Dao层的接口(interface):UserDao.java
package cn.itcast.dao; import cn.itcast.domain.User; public interface UserDao { public void saveUser(User user); public User findUserByName(String name); public User findUserById(int id); public void updateUser(User user); public void remove(User user); }
package cn.itcast.dao; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public final class HibernateUtil { private static SessionFactory sessionFactory; private HibernateUtil(){ } static{ Configuration cfg = new Configuration(); cfg.configure(); sessionFactory = cfg.buildSessionFactory(); } public static SessionFactory getSessionFactory(){ return sessionFactory; } public static Session getSession(){ return sessionFactory.openSession(); } }接下来。我们就要写Dao层的实现了:UserDaoImpl.java
package cn.itcast.dao.impl; import org.hibernate.Criteria; import org.hibernate.Session; import org.hibernate.Transaction; import org.hibernate.criterion.Restrictions; import cn.itcast.dao.HibernateUtil; import cn.itcast.dao.UserDao; import cn.itcast.domain.User; public class UserDaoImpl implements UserDao { @Override public void saveUser(User user) { //保存一个对象 Session s = null; Transaction tx = null; try{ s = HibernateUtil.getSession(); tx = s.beginTransaction(); s.save(user); tx.commit(); }finally{ if(s!=null){ s.close(); } } } @Override public User findUserByName(String name) { //通过name查找一个对象 Session s = null; try{ s = HibernateUtil.getSession(); Criteria c = s.createCriteria(User.class); c.add(Restrictions.eq("name", name)); User user = (User)c.uniqueResult();//这里返回的是唯一的 return user; }finally{ if(s!=null){ s.close(); } } } @Override public User findUserById(int id) { //通过id查找一个对象 Session s = null; try{ s = HibernateUtil.getSession(); User user = (User) s.get(User.class, id); return user; }finally{ if(s!=null){ s.close(); } } } @Override public void updateUser(User user) { //更新一个对象 Session s = null; Transaction tx = null; try{ s = HibernateUtil.getSession(); tx = s.beginTransaction(); s.update(user); tx.commit(); }finally{ if(s!=null){ s.close(); } } } @Override public void remove(User user) { //删除一个对象 Session s = null; Transaction tx = null; try{ s = HibernateUtil.getSession(); tx = s.beginTransaction(); s.delete(user); tx.commit(); }finally{ if(s!=null){ s.close(); } } } }
最后,我们编写一个測试类类验证是否成功:DaoTest.java
package cn.test; import java.util.Date; import cn.itcast.dao.UserDao; import cn.itcast.dao.impl.UserDaoHibernateImpl; import cn.itcast.domain.User; public class DaoTest { /** * @param args */ public static void main(String[] args) { UserDao dao = new UserDaoHibernateImpl(); User user = new User(); user.setName("name"); user.setBirthday(new Date()); dao.saveUser(user); user.setName("new name"); dao.updateUser(user); User u = dao.findUserByName(user.getName()); dao.remove(u); } }
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