Eclipse下Hibernate使用学习

个人学习记录：

1：Hibernate 开发包引入：

至官网下载所需版本的开发包，将加压后的jar包引入项目中：src/main/webapp/WEB-INF/lib/

2:Hibernate tool安装

查看Elipse版本，Help >About Eclipse，然后到JBoss Tools - Home 官网找到对应Eclipse版本的安装链接：例如：Index of /jbosstools/photon/stable/updates

回到Eclipse中，Help>Install New Software

或者直接Help>Eclipse Marketplace 搜索 "Hibernate Tool"

3:新建hibernate配置文件：

选中项目源代码，通过向导新增Hibernate Configuation File, 配置文件名称为：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><property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property><property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property><property name="hibernate.connection.password">111111</property><property name="hibernate.connection.url">jdbc:mysql://127.0.0.1:3306/sakila?serverTimezone=GMT</property><property name="hibernate.connection.username">root</property><property name="hibernate.default_schema">sakila</property><property name="hibernate.show_sql">true</property><property name="hibernate.format_sql">true</property> </session-factory>
</hibernate-configuration>

4:利用Hibernate tool 自动生成简单Java类(POJO)

单击工具栏：Hibernate tool 下拉框，点击"Hibernate Code Generation Configurations"

切换到Exports选项卡中：

生成的java类和xml映射文件示例：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping auto-import="true" default-access="property" default-cascade="none" default-lazy="true"><class name="entity.Actor" table="actor"><id name="actorId" type="java.lang.Short"><column name="actor_id"/><generator class="identity"/></id><property generated="never" lazy="false" name="firstName" optimistic-lock="true" type="string" unique="false"><column length="45" name="first_name" not-null="true"/></property><property generated="never" lazy="false" name="lastName" optimistic-lock="true" type="string" unique="false"><column length="45" name="last_name" not-null="true"/></property><property generated="never" lazy="false" name="lastUpdate" optimistic-lock="true" type="timestamp" unique="false"><column length="19" name="last_update" not-null="true"/></property></class>
</hibernate-mapping>

MySql中的示例数据库:sakila中的Actor表结构如下：

'actor_id', 'smallint unsigned', 'NO', 'PRI', NULL, 'auto_increment'
'first_name', 'varchar(45)', 'NO', '', NULL, ''
'last_name', 'varchar(45)', 'NO', 'MUL', NULL, ''
'last_update', 'timestamp', 'NO', '', 'CURRENT_TIMESTAMP', 'DEFAULT_GENERATED on update CURRENT_TIMESTAMP'

package entity;
import java.util.Date;/*** Actor generated by hbm2java*/
public class Actor implements java.io.Serializable {private static final long serialVersionUID = 1L;private Short actorId;private String firstName;private String lastName;private Date lastUpdate;public Actor(String firstName,String lastName) {this.firstName=firstName;this.lastName=lastName;this.lastUpdate=new Date();} public Actor() {}public Actor(String firstName, String lastName, Date lastUpdate) {this.firstName = firstName;this.lastName = lastName;this.lastUpdate = lastUpdate;}public Short getActorId() {return this.actorId;}public void setActorId(Short actorId) {this.actorId = actorId;}public String getFirstName() {return this.firstName;}public void setFirstName(String firstName) {this.firstName = firstName;}public String getLastName() {return this.lastName;}public void setLastName(String lastName) {this.lastName = lastName;}public Date getLastUpdate() {return this.lastUpdate;}public void setLastUpdate(Date lastUpdate) {this.lastUpdate = lastUpdate;}
}

5：利用Hibernate持久化java类对象：

在hibernate.cfg.xml中添加映射文件：

<session-factory>...<mapping resource="entity/Actor.hbm.xml"/><mapping resource="entity/Address.hbm.xml"/></session-factory>

新建一个java类，引入junit测试：

双击AddActor方法，右键RunAs >JUnit Test

package example;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.jupiter.api.Test;
import entity.Actor;
public class HibernateTest {@Testvoid AddActor() { Configuration configuration = new Configuration().configure();SessionFactory sessionFactory = configuration.buildSessionFactory();Session session = sessionFactory.openSession(); Transaction transaction = session.beginTransaction();     try {Actor actor = new Actor("JIM", "Green");          session.save(actor);            transaction.commit();           } catch (Exception e) {e.printStackTrace();} finally {session.close();sessionFactory.close();}}
}