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(一) 系统环境
应用服务器:JBoss AS 4.2.2GA
数据库:MySQL Server 5.0
开发工具:JBossTools 2.0.0 GA
测试工具:TestNG 5.7
(二) 数据库准备
1. 创建数测试据库test
Database:test
Username:test
Password:test
2. 创建Person表
DROP TABLE IF EXISTS `test`.`person`;
CREATE TABLE `test`.`person` (
`ID` int(10) unsigned NOT NULL auto_increment,
`Name` varchar(45) NOT NULL,
`Age` int(10) unsigned NOT NULL,
PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;
(三) 创建EJB项目
1. 在Eclipse中选择菜单“File->New->Project…”,在出现的“New Project”窗口中选择“EJB Project”;在出现“New EJB Project”向导的“EJB Project”窗格中输入如下信息:
Project Name:HelloJPA
Target Runtime:JBoss 4.2 Runtime
选择“Next”继续;
2. 在出现的“Project Facets”窗格中选择如下信息:
EJB Module:3.0
Java:5.0
Java Persistence:1.0
选择“Next”继续;
3. 在出现的“EJB Module”窗格中输入如下信息:
Source Folder:src
4. 在出现的“JPA Facet”窗格中选择“Finish”,EJB项目创建结束。HelloJPA项目的结构如下:
(四) 配置Hibernate 代码生成环境
1. 在Eclipse的菜单中选择“File->New->Other->Hibernate->Hibernate Configuration File(cfg.xml)”;
2. 在出现的“Create Hibernate Configuration File(cfg.xml)”窗格中选择“HelloJPA->src”设置将hibernate.cfg.xml文件放在src文件夹;选择“Next”继续;
3. 在出现的“Hibernate Configuration File(cfg.xml)”窗格中输入如下信息:
Database dialect:MySQL
Driver class:com.mysql.jdbc.Driver
Connection URL:jdbc:mysql://localhost:3306/test
Username:test
Password:test
同时钩选“create a console configuration”,选择“Next”继续;
4. 在出现的“Create Hibernate Console Configuration”窗格中,在“Type”中选择“Core”,选择“Finish”结束Hibernate配置。
(五) 生成EntityBean代码
1. 在Eclipse中切换到“Hibernate”Perspective,在菜单中选择“Run->Hibernate Code Generation…->Open Hibernate Code Generation Dialog…”;
2. 在打开的“Hibernate Code Generation”窗口中,新建一个配置,并钩选如下信息:
Console Configuration:HelloJPA
Output directory:/HelloJPA1/src
钩选“Reverse engineering from JDBC connection”
Package:demo
3. 选择“Exporters”属性页,输入如下信息:
“Uase Java 5 syntax”
“Generate EJB3 annotation”
“Doamin Code”
选择“Finish”将生成EntityBean文件Person.java,内容如下:
package demo;
// Generated 2008-2-1 0:06:15 by Hibernate Tools 3.2.0.CR1
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.Table;
/**
* Person generated by hbm2java
*/
@Entity
@Table(name = "person", catalog = "test")
public class Person implements java.io.Serializable {
private Integer id;
private String name;
private int age;
public Person() {
}
public Person(String name, int age) {
this.name = name;
this.age = age;
}
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "ID", unique = true, nullable = false)
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(name = "Name", nullable = false, length = 45)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@Column(name = "Age", nullable = false)
public int getAge() {
return this.age;
}
public void setAge(int age) {
this.age = age;
}
}
(六) 修改Persistence.xml设置
修改后的内容如下:
<class>demo.Personclass>
(七) 编写单元测试
1. 在Eclipse中,选择菜单“File->New->Other->Class”,在出现的窗口中输入如下信息:
Package:test
Name:TestPerson
选择“Finish”创建TestPerson.java文件;
2. 编写测试类:TestPerson,具体代码如下:
package test;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import org.testng.annotations.*;
import demo.Person;
public class TestPerson {
private EntityManagerFactory factory;
private EntityManager em;
@BeforeTest
public void setUp() {
factory = Persistence.createEntityManagerFactory("HelloJPA");
em = factory.createEntityManager();
}
@AfterTest
public void tearDown() {
em.close();
}
@Test (groups = {"unit"})
public void testSave() {
Person p = new Person();
p.setAge(30);
p.setName("jbossweek");
em.getTransaction().begin();
em.persist(p);
assert em.contains(p);
em.getTransaction().commit();
}
}
(八) 执行单元测试
1、 在Eclipse中选择“TestPerson.java”文件,右键单击在出现的上下文菜单中选择“Run as -> TestNG test”
2、 测试通过,打开MySQL Query Browser程序,执行“SELECT * FROM person p”,查询结果表示已经将测试数据保存到Person表中
3. ok,EntityBean的创建成功。