Hibernate入门基本部署

Posted 2020-09-22 飘逸110

1，建立java工程，导入jar包

　　Hibernate依赖jar包，lib/required/*.jar,核心包hibernate3.jar，数据库驱动包

2，所有jar包的作用

3，创建核心配置文件到src目录中，hibernate.cfg.xml

<?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/hibernate?useUnicode=true&characterEncoding=utf-8</property>
	<property name="myeclipse.connection.profile">hibernate1</property>
	<property name="connection.username">root</property>
	<property name="connection.password"></property>
	<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
	<property name="hibernate.show_sql">true</property>

	<mapping resource="com/lz/javabean/customer.hbm.xml"/>
</session-factory>
</hibernate-configuration>

4,创建持久化类Customer.java

package com.lz.javabean;
import java.io.Serializable;

@SuppressWarnings("serial")
public class Customer implements Serializable{
	private Integer id;
    private String name;
    private Integer age;
    private String des;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	public String getDes() {
		return des;
	}
	public void setDes(String des) {
		this.des = des;
	}
	public Customer(Integer id, String name, Integer age, String des) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
		this.des = des;
	}
	public Customer() {
		super();
		// TODO Auto-generated constructor stub
	}
	@Override
	public String toString() {
		return "Customer [id=" + id + ", name=" + name + ", age=" + age
				+ ", des=" + des + "]";
	}

}

 5，创建对应的数据表

create table customer
(
  id              int primary key,
  name        varchar(12),
  age           int,
  des           text
)

 6，创建ORM映射配置文件customer.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="org.hibernate.tutorial.domain">
	<class name="com.lz.javabean.Customer">
		<id name="id">
			<generator class="native"></generator>
		</id>
		<property name="name" column="name"/>
		<property name="age" column="age"/>
		<property name="des" column="des"/>
	</class>
</hibernate-mapping>

 7，测试类

package com.lz.test;

import org.hibernate.SessionFactory;
import org.hibernate.classic.Session;
import org.junit.Test;

import com.lz.javabean.Customer;
import com.lz.util.SessionFactoryUtil;

public class HibernateTest {
	@Test
	public void addCustomer(){    
                Configuration cfg=new Configuration().configure();
		SessionFactory factory=cfg.buildSessionFactory();
		Session session=factory.openSession();
		session.beginTransaction();
		Customer customer=new Customer(1, "李四", 10, "帅气");
		session.save(customer);
		session.getTransaction().commit();
		session.close();
	}
}            

 成功保存Customer对象

8，其他方法的介绍

get(Customer.class,id);若主键id值不存在，返回null，立即执行sql语句

load(Customer.class,id);支持延迟加载，在使用对象时才发出sql语句，使用CGLIB代理，查询id不存在，抛出对象找不到异常

delete(customer);

update(customer);