TopLink EJB 保存

最新推荐文章于 2025-08-05 09:27:48 发布

原创最新推荐文章于 2025-08-05 09:27:48 发布 · 584 阅读

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#ejb #glassfish #string #properties #jdbc #encoding

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本文介绍如何在Java SE环境下利用TopLink Essentials进行基本的持久化操作，包括导入所需库、创建实体类、配置持久化单元以及执行CRUD操作。通过示例代码展示了如何创建和保存News实体，并在最终提交事务前关闭EntityManager。

在java se 下面进行一个简单的测试，需要准备的工作是：
1：导入toplink-essentials，toplink-essentials-agent 还有数据库对应jdbc的jar 还有ejb的jar包

下面语句直接照抄就OK 了

本环境使用的glassfish ，你可以添加glassfish的JEE库

package com.hjc;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class JpaQs {
static final EntityManagerFactory emf = Persistence.createEntityManagerFactory("qs");
public static void main(String[] args) {
final EntityManager em = emf.createEntityManager();
News news = new News();
news.setTitle("this is Title");
news.setContent("this is content");
try
{
//开启事务
em.getTransaction().begin();
//保存实体
em.persist(news);
//提交事务
em.getTransaction().commit();
}
finally
{
em.close();
}
}

}

package com.hjc;
import javax.persistence.*;
@Entity
@Table(name="new_table")
public class News {

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int id;

@Column(name="news_title",length=50)
private String title;

@Column(nullable=true)
private String content;

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getContent() {
return content;
}

public void setContent(String content) {
this.content = content;
}
}

<?xml version="1.0" encoding="GBK"?>
<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

<persistence-unit name="qs" transaction-type="RESOURCE_LOCAL">
<provider>oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider</provider>
<class>com.hjc.News</class>
<properties>
<property name="toplink.jdbc.driver" value="oracle.jdbc.OracleDriver"/>
<property name="toplink.jdbc.url" value="jdbc:oracle:thin:@localhost:1521:hjc"/>
<property name="toplink.jdbc.user" value="scott"/>
<property name="toplink.jdbc.password" value="tiger"/>
<property name="toplink.target-database" value="Auto"/>
<property name="toplink.ddl-generation" value="create-tables"/>
<property name="toplink.logging.level" value="FINE" />
<property name="toplink.logging.timestamp" value="false" />
<property name="toplink.logging.session" value="false" />
<property name="toplink.logging.thread" value="false" />
<property name="toplink.logging.exceptions" value="true" />
<property name="toplink.dll-generation" value = "create-tables"/>
</properties>
</persistence-unit>
</persistence>

这行语句在插入的时候，如果表中没有内容的话，会自动建表，所以加上这句