hibernate入门级

hibernate是数据层的架构，想必大家很熟了吧，话不多说，直接贴代码。

首先是hibernate.cfg.xml的配置，实际上这里就是数据库的配置：

<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://www.hibernate.org/dtd/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://127.0.0.1:3306/test</property>
		<property name="connection.username">root</property>
		<property name="connection.password">123456</property>
		
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
		<property name="show_sql">true</property>
		<property name="hbm2ddl.auto">update</property>
		
		<mapping resource="com/hibernate/entity/User.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.hibernate.entity"><!-- package为class所在的包 -->
    <class name="User" table="user">
        <id name="id" type="int"><!-- 这相当于@column,匹配数据库中的字段，进行daoimpl的操作 -->
            <generator class="native" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="name"  />
        </property>
        <property name="password" type="java.lang.String">
            <column name="password" />
        </property>
    </class>
</hibernate-mapping>

第一是LoginController:

/*
 * 这个类测试用
 * 
 * 
 */

public class LoginController {
	
	public static void main(String[] args){
		 
		User user=new User();
		user.setName("123");
		user.setPassword("123");
		
	    LoginDao loginDao=new LoginDaoImpl();  
	    User user2=loginDao.login(user);//调用登录方法
	    
	    //打印取出的ID
	    if(user2!=null){
	    	System.out.println("id:"+user2.getId());
	    }
	    
	}
   
}

这种方式不好哦，这个测试比较简单才这么做。

public interface LoginDao {
    public User login(User user);
}

public class LoginDaoImpl implements LoginDao{
	
    private Session session;
    private static HibernateUtil hibernateUtil;
    
    //静态加载session工厂生产session类
    static{
    	hibernateUtil=new HibernateUtil();
    }
    
	public User login(User user) {
		
		User user2=new User();		
		session=hibernateUtil.getSession();//获得由session工厂生产的session
		
		Query query=session.createQuery("select u from User u");
		List<User> list=query.list();			
		user2.setId(list.get(0).getId());
		
		return user2;
	}

}

public class User {
    private int id;
    private String name;
    private String password;
    
    
	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 String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}   
}

这些东西仅供参考，感觉数据层的处理还是挺好用的，但单独用的话配置太繁琐，结合spring会好用很多。