JBossTools实践系列:开发EJB3 EntityBean

作者:JBossWeek http://blog.csdn.net/JBossweek email:jbossweek AT gmail.com

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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:

JBossTools实践系列:开发EJB3 EntityBean_第1张图片 

(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:

org.hibernate.ejb.HibernatePersistence

<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。

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