Hibernate源碼解析

一、先在官網 https://sourceforge.net/projects/hibernate/ 下載最新版本的開發包

下載解壓后

• documentation存放Hibernate的相關文件與API
• lib存放Hibernate編譯和運行所依賴的jar包，其中required子目錄下包含了運行Hibernate項目必須的jar包。
• project存放Hibernate各種相關的源代碼與資源，project目錄下的etc目錄非常重要，它里面有一些關于Hibernate的配置信息。

二、新建一個 Java Project 即可

三、導入項目所需的jar包

四、配置Hibernate4框架各個層

創建數據庫和表

CREATE DATABASE hibernate; USE hibernate;DROP TABLE IF EXISTS `t_class`; CREATE TABLE `t_class` (`classId` bigint(20) NOT NULL AUTO_INCREMENT,`className` varchar(255) DEFAULT NULL,PRIMARY KEY (`classId`) ) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8;DROP TABLE IF EXISTS `t_student`; CREATE TABLE `t_student` (`stuId` bigint(20) NOT NULL AUTO_INCREMENT,`stuName` varchar(255) DEFAULT NULL,`classId` bigint(20) DEFAULT NULL,PRIMARY KEY (`stuId`),KEY `FK_frxpowmeqnmf3sflhwgq3x0ub` (`classId`),CONSTRAINT `FK_frxpowmeqnmf3sflhwgq3x0ub` FOREIGN KEY (`classId`) REFERENCES `t_class` (`classId`) ) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8;

項目結構

Hibernate4相關配置文件

• hibernate.cfg.xml：它是Hibernate框架的核心配置文件。放在src目錄下
• xxx.hbm.xml：它主要是用于描述類與數據庫中的表的映射關系。放在 hsx.com.model 目錄下

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?> <!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><!--數據庫連接設置 --><property name="connection.driver_class">com.mysql.jdbc.Driver</property><property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property> //hibernate為數據庫名<property name="connection.username">root</property><property name="connection.password">123456</property> //數據庫密碼<!-- 方言 --><property name="dialect">org.hibernate.dialect.MySQL5Dialect</property><!-- 控制臺顯示SQL --><property name="show_sql">true</property><!-- 自動更新表結構 --><property name="hbm2ddl.auto">update</property><mapping resource="hsx/com/model/Student.hbm.xml"/><!-- 映射到Teacher的實體@Entity --><mapping class="hsx.com.model.Student"/> </session-factory></hibernate-configuration>

Student.hbm.xml

<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC"-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><!-- 配置文件 --><hibernate-mapping package="hsx.com.model"><class name="Student" table="t_student"> <!-- name 實體類類名，table=數據表表名 --><id name="id" column="stuId"> <!--id是數據表中主鍵的映射，其他字段用property；name表示實體類中的屬性，column表示id映射到數據表的字段名 --><generator class="native"></generator></id><property name="name" column="stuName"></property><many-to-one name="c" column="classId" class="hsx.com.model.Class" cascade="save-update"></many-to-one> <!-- 在<many-to-one>這端，cascade默認是"none"，假如我們希望在持久化多的一端的時候，自動級聯保存和更新一的一端，可把cascade設置成"save-update" --></class></hibernate-mapping>

創建實體類
hsx.com.model.Student.java

package hsx.com.model;public class Student {private long id;private String name;private Class c;public long getId() {return id;}public void setId(long id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Class getC() {return c;}public void setC(Class c) {this.c = c;}@Overridepublic String toString() {return "Student [id=" + id + ", name=" + name + "]";}}

生成Session工廠
hsx.com.util.HibernateUtil.java

package hsx.com.util;import org.hibernate.SessionFactory; import org.hibernate.boot.registry.StandardServiceRegistryBuilder; import org.hibernate.cfg.Configuration; import org.hibernate.service.ServiceRegistry;public class HibernateUtil {private static final SessionFactory sessionFactory = buildSessionFactory();private static SessionFactory buildSessionFactory() {/* 實例化配置文件 */Configuration configuration = new Configuration().configure();/* 實例化服務登記 */ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();/* 獲取Session工廠 */return configuration.buildSessionFactory(serviceRegistry);}public static SessionFactory getSessionFactory() {return sessionFactory;}}

創建測試類
hsx.com.service.StudentTest.java

package hsx.com.service;import java.util.List; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import hsx.com.model.Student; import hsx.com.util.HibernateUtil;/*XML版CRUD實現*/ public class StudentTest {private SessionFactory sessionFactory = HibernateUtil.getSessionFactory();public static void main(String[] args) {StudentTest studentTest = new StudentTest();studentTest.add();// studentTest.delete();// studentTest.update();// studentTest.getAllStudent();}private void add() {/* 生成一個session */Session session = sessionFactory.openSession();/* 開啟事務 */session.beginTransaction();Student s = new Student();s.setName("周杰倫");session.save(s);/* 提交事務 */session.getTransaction().commit();/* 關閉session */session.close();}private void delete() {/* 生成一個session */Session session = sessionFactory.openSession();/* 開啟事務 */session.beginTransaction();Student student = (Student) session.get(Student.class, Long.valueOf(1));session.delete(student);/* 提交事務 */session.getTransaction().commit();/* 關閉session */session.close();}private void update() {/* 生成一個session */Session session = sessionFactory.openSession();/* 開啟事務 */session.beginTransaction();Student student = (Student) session.get(Student.class, Long.valueOf(2));student.setName("張三2");session.save(student);/* 提交事務 */session.getTransaction().commit();/* 關閉session */session.close();}private void getAllStudent() {/* 生成一個session */Session session = sessionFactory.openSession();/* 開啟事務 */session.beginTransaction();String hql = "from Student";Query query = session.createQuery(hql);@SuppressWarnings("unchecked")List<Student> studentList = query.list();for (Student student : studentList) {System.out.println(student);}/* 提交事務 */session.getTransaction().commit();/* 關閉session */session.close();}}

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