Hibernate 最基本的内容

Hibernate 的所有操作都基于Session进行的，增、删、改、查都是通过Session完成的。

 

Hibernate 最基础的内容包括以下内容:

 

1. 一个主配置文件,hibernate.cfg.xml ，最基本的内容如下:

 

<?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">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

<session-factory>
	<property name="myeclipse.connection.profile">Oracle Conn</property>
	<property name="connection.url">jdbc:mysql://localhost:3306/vvop?useUnicode=true&amp;characterEncoding=UTF-8</property>
	<property name="connection.username">root</property>
	<property name="connection.password">123456</property>
	<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
	<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
	<property name="show_sql">true</property>
	<mapping resource="net/kentop/testhibernate/demo01/Titem.hbm.xml"></mapping>


</session-factory>

</hibernate-configuration>

 

 

2. 一个Pojo 类, 内容如下:

 

package net.kentop.testhibernate.demo01;

public class User {
	
	private String id;
	private String name;
	private String sex;
	private Integer age;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	
}

 

 

 

3. 一个Pojo类的描述文件

 

 

<?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" >

<!-- DO NOT EDIT: This is a generated file that is synchronized -->
<!-- by MyEclipse Hibernate tool integration.                   -->
<!-- Created Mon Dec 18 19:38:27 CST 2006                         -->
<hibernate-mapping package="net.kentop.testhibernate.demo01">

	<class name="User" table="user">
		<id name="id" column="id" type="string">
			<generator class="uuid.hex" />
		</id>

		<property name="name" column="name" type="string" not-null="true" />
		<property name="sex" column="sex" type="string" />
		<property name="age" column="age" type="int" />
	</class>

</hibernate-mapping>

 

 

4. 一个进行增\删\改\查的操作类

 

package net.kentop.testhibernate.demo01;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class UserOpera {
	
	private Session session;
	
	public UserOpera() {
		Configuration config = new Configuration().configure();
		
		SessionFactory factory = config.buildSessionFactory();
		
		this.session = factory.openSession();
	}
	
	
	public void insert(User user) {
		session.save(user);
		this.session.beginTransaction().commit();
		
		this.session.close();
	}
	
	public void insertUsers(ArrayList<User> users) {
		
		int i = 0;
		for(User user:users ) {
			session.save(user);
			i ++;
			if(i % 3 == 0) {
				session.beginTransaction().commit();
			}
		}
		session.beginTransaction().commit();
		
	}
	
	public User getUserById(String id) {
		
		User user = null;
		
		String hql = "from User where id=?";
		
		Query query = this.session.createQuery(hql);
		query.setString(0, id);
		List l = query.list();
		
		Iterator iter = l.iterator();
		
		while(iter.hasNext()) {
			user = (User)iter.next();
		}
		
		
		
		return user;
		
		
	}
	
	public void deleteById(String id) {
		
		String hql = "delete User where id=?";
		Query q = this.session.createQuery(hql);
		q.setString(0, id);
		
		q.executeUpdate();
		
		this.session.beginTransaction().commit();
		
	}
	
	public List getAllUser() {
		
		String hql = "from User";
		Query q = session.createQuery(hql);
		
		return q.list();
		
	}
}

 

 

 

上面就是全部的内容，然后再写一个测试类就是了。