码迷，mamicode.com
首页 > 其他好文 > 详细

Maven 版 JPA 最佳实践

时间：2014-11-20 21:36:18      阅读：315      评论：0      收藏：0      [点我收藏+]

标签：style   blog   http   io   ar   os   使用   sp   java   

项目结构图

bubuko.com,布布扣

数据库环境

  • 数据库：MySQL
  • 版本：5.x
  • 数据库名：jpa-demo
  • 用户名密码：root/1234

代码清单 1：数据库脚本：

/*
Navicat MySQL Data Transfer

Source Server         : localhost
Source Server Version : 50525
Source Host           : localhost:3306
Source Database       : jpa-demo

Target Server Type    : MYSQL
Target Server Version : 50525
File Encoding         : 65001

Date: 2014-11-20 20:09:27
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for `address`
-- ----------------------------
DROP TABLE IF EXISTS `address`;
CREATE TABLE `address` (
  `addressID` int(11) NOT NULL,
  `city` varchar(55) NOT NULL,
  `street` varchar(55) NOT NULL,
  `zip` varchar(8) NOT NULL,
  PRIMARY KEY (`addressID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of address
-- ----------------------------
INSERT INTO `address` VALUES (‘1‘, ‘深圳‘, ‘坂田市场‘, ‘518001‘);
INSERT INTO `address` VALUES (‘2‘, ‘深圳‘, ‘坂田路口‘, ‘518002‘);
INSERT INTO `address` VALUES (‘3‘, ‘深圳‘, ‘四季花城‘, ‘518003‘);

-- ----------------------------
-- Table structure for `userinfo`
-- ----------------------------
DROP TABLE IF EXISTS `userinfo`;
CREATE TABLE `userinfo` (
  `userID` int(11) NOT NULL,
  `username` varchar(20) NOT NULL,
  `birthday` datetime DEFAULT NULL,
  `sex` varchar(8) NOT NULL,
  `addressID` int(11) NOT NULL,
  PRIMARY KEY (`userID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of userinfo
-- ----------------------------
INSERT INTO `userinfo` VALUES (‘1‘, ‘张金雄‘, null, ‘male‘, ‘1‘);
INSERT INTO `userinfo` VALUES (‘2‘, ‘李某某‘, null, ‘male‘, ‘2‘);
INSERT INTO `userinfo` VALUES (‘3‘, ‘王某某‘, ‘2006-08-10 00:00:00‘, ‘female‘, ‘3‘);
INSERT INTO `userinfo` VALUES (‘4‘, ‘陈某某‘, ‘2006-08-12 00:00:00‘, ‘male‘, ‘3‘);

源代码

代码清单 2：pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.coderdream</groupId>
	<artifactId>jpa-demo</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>jpa-demo Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<junit.version>4.11</junit.version>
		<mysql.version>5.1.17</mysql.version>
		<slf.version>1.7.5</slf.version>
		<toplink.essentials.version>2.1-60f</toplink.essentials.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>toplink.essentials</groupId>
			<artifactId>toplink-essentials</artifactId>
			<version>${toplink.essentials.version}</version>
		</dependency>

		<dependency>
			<groupId>toplink.essentials</groupId>
			<artifactId>toplink-essentials-agent</artifactId>
			<version>${toplink.essentials.version}</version>
		</dependency>

		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>${slf.version}</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.version}</version>
		</dependency>
	</dependencies>
	<build>
		<finalName>jpa-demo</finalName>
	</build>
</project>

代码清单 3：persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence 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"
	version="1.0">

	<persistence-unit name="piscesPU" transaction-type="RESOURCE_LOCAL">
		<provider>
			oracle.toplink.essentials.PersistenceProvider
		</provider>
		<class>com.coderdream.model.UserInfo</class>
		<class>com.coderdream.model.Address</class>
		<properties>
			<!-- 数据库连接配置, JDBC驱动 -->
			<property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver" />
			<!-- 数据库连接配置,URL -->
			<property name="toplink.jdbc.url" value="jdbc:mysql://localhost:3306/jpa-demo" />
			<!-- 数据库连接配置, 用户名 -->
			<property name="toplink.jdbc.user" value="root" />
			<!-- 数据库连接配置, 密码 -->
			<property name="toplink.jdbc.password" value="1234" />
		</properties>
	</persistence-unit>

</persistence>

代码清单 4：Address.java

package com.coderdream.model;

import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;

@Entity
public class Address implements Serializable {
	// 地址id, 不能为空, 必须唯一
	@Id
	@Column(name = "addressid", unique = true, nullable = false)
	private int addressid;

	// 城市, 不能为空
	@Column(name = "city", nullable = false)
	private String city;

	// 街道, 不能为空
	@Column(name = "street", nullable = false)
	private String street;

	// 邮政编码, 不能为空
	@Column(name = "zip", nullable = false)
	private String zip;

	public Address() {
	}

	public Address(int addressid) {
		this.setAddressid(addressid);
	}

	public int getAddressid() {
		return this.addressid;
	}

	public void setAddressid(int addressid) {
		this.addressid = addressid;
	}

	public String getCity() {
		return this.city;
	}

	public void setCity(String city) {
		this.city = city;
	}

	public String getStreet() {
		return street;
	}

	public void setStreet(String street) {
		this.street = street;
	}

	public String getZip() {
		return this.zip;
	}

	public void setZip(String zip) {
		this.zip = zip;
	}

	@Override
	public int hashCode() {
		return this.addressid;
	}

	@Override
	public boolean equals(Object object) {
		if (!(object instanceof Address))
			return false;
		final Address other = (Address) object;
		return this.addressid == other.addressid;
	}

	@Override
	public String toString() {
		return "Address[addressid=" + getAddressid() + ", city=‘" + getCity() + "‘, street=‘" + getStreet() + "‘, zip=‘" + getZip() + "";
	}
}

代码清单 5：UserInfo.java

package com.coderdream.model;

import java.io.Serializable;
import java.sql.Timestamp;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import static javax.persistence.CascadeType.*;

@Entity
public class UserInfo implements Serializable {
	// 用户id, 不能为空, 必须唯一
	@Id
	@Column(name = "userid", unique = true, nullable = false)
	private int userid;

	// 用户名, 不能为空
	@Column(name = "userName", nullable = false)
	private String userName;

	// 性别, 不能为空
	@Column(name = "sex", nullable = false)
	private String sex;

	// 出生日期, 可以为空
	@Column(name = "birthday")
	private Timestamp birthday;

	// 地址, 不能为空
	// PERSIST 表示更新、新增UserInfo数据时会同时更新、新增Address的数据
	// REMOVE 表示从数据库删除UserInfo会同时删除Address表中对应的数据
	@OneToOne(cascade = { PERSIST, REMOVE })
	@JoinColumn(name = "addressID", nullable = false)
	private Address address;

	public UserInfo() {
	}

	public UserInfo(int userid) {
		this.setUserid(userid);
	}

	@Override
	public int hashCode() {
		return this.getUserid();
	}

	@Override
	public boolean equals(Object object) {
		if (!(object instanceof UserInfo))
			return false;
		final UserInfo other = (UserInfo) object;
		return this.userid == other.userid;
	}

	@Override
	public String toString() {
		return "UserInfo[userid=" + this.userid + ", userName=‘" + userName + "‘, sex=‘" + sex + "‘, birthday=" + birthday + ", address="
				+ address + "";
	}

	public int getUserid() {
		return userid;
	}

	public void setUserid(int userid) {
		this.userid = userid;
	}

	public String getUserName() {
		return userName;
	}

	public void setUserName(String userName) {
		this.userName = userName;
	}

	public Timestamp getBirthday() {
		return birthday;
	}

	public void setBirthday(Timestamp birthday) {
		this.birthday = birthday;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public Address getAddress() {
		return address;
	}

	public void setAddress(Address address) {
		this.address = address;
	}
}

代码清单 6：SimpleService.java

package com.coderdream.service;

import java.util.List;

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

import com.coderdream.model.Address;
import com.coderdream.model.UserInfo;

public class SimpleService {

	/**
	 * 删除用户id=6的数据
	 */
	public static void delete() {
		final EntityManagerFactory emf = Persistence.createEntityManagerFactory("piscesPU");
		final EntityManager em = emf.createEntityManager();
		// 找不到数据的话这里会抛异常
		UserInfo info = em.find(UserInfo.class, 6);
		try {
			em.getTransaction().begin();
			em.remove(info);
			em.getTransaction().commit();
		} finally {
			em.close();
		}
	}

	/**
	 * 修改用户id=6的数据
	 */
	public static void update() {
		final EntityManagerFactory emf = Persistence.createEntityManagerFactory("piscesPU");
		final EntityManager em = emf.createEntityManager();
		// 找不到数据的话这里会抛异常
		UserInfo info = em.find(UserInfo.class, 6);
		info.setUserName("哈哈");
		info.getAddress().setStreet("坂田2");
		try {
			em.getTransaction().begin();
			// 自动将info更新到数据库
			em.getTransaction().commit();
		} finally {
			em.close();
		}
	}

	/**
	 * 查询所有用户数据
	 */
	public static void query() {
		final EntityManagerFactory emf = Persistence.createEntityManagerFactory("piscesPU");
		long s = System.currentTimeMillis();
		// 数据库连接失败这里会抛出异常
		final EntityManager em = emf.createEntityManager();
		long e = System.currentTimeMillis();
		System.out.println("连接数据库耗时: " + (e - s) + "毫秒");
		// 获取数据
		@SuppressWarnings("unchecked")
		List<UserInfo> list = em.createQuery("SELECT a FROM UserInfo a").getResultList();
		int i = 0;
		for (UserInfo info : list) {
			System.out.println("第" + (++i) + "个值为: " + info);
		}
		em.close();
	}

	/**
	 * 创建用户id=6的一条数据, 地址id=6
	 */
	public static void create() {
		final EntityManagerFactory emf = Persistence.createEntityManagerFactory("piscesPU");
		final EntityManager em = emf.createEntityManager();

		UserInfo info = new UserInfo(6);
		info.setSex("male");
		info.setUserName("张某某");
		info.setBirthday(new java.sql.Timestamp(System.currentTimeMillis()));
		Address naddr = new Address(6);
		naddr.setCity("深圳");
		naddr.setStreet("坂田");
		naddr.setZip("518000");
		info.setAddress(naddr);

		try {
			em.getTransaction().begin();
			em.persist(info);
			em.getTransaction().commit();
		} finally {
			em.close();
		}
	}

	/**
	 * 主函数
	 */
	public static void main(String[] args) throws Throwable {
		SimpleService.query();
		SimpleService.create();
		System.out.println("新增一条数据后进行查询");
		SimpleService.query();
		SimpleService.update();
		System.out.println("修改一条数据后进行查询");
		SimpleService.query();
		SimpleService.delete();
		System.out.println("删除一条数据后进行查询");
		SimpleService.query();
	}
}

运行结果

[TopLink Info]: 2014.11.20 08:24:08.134--ServerSession(1112823384)--TopLink, version: Oracle TopLink Essentials - 2.1 (Build 60f (01/07/2009))
[TopLink Info]: 2014.11.20 08:24:08.822--ServerSession(1112823384)--file:/E:/E_441_64/workspace/jpa-demo/target/classes/-piscesPU login successful
连接数据库耗时: 1264毫秒
第1个值为: UserInfo[userid=1, userName=‘张金雄‘, sex=‘male‘, birthday=null, address=Address[addressid=1, city=‘深圳‘, street=‘坂田市场‘, zip=‘518001
第2个值为: UserInfo[userid=2, userName=‘李某某‘, sex=‘male‘, birthday=null, address=Address[addressid=2, city=‘深圳‘, street=‘坂田路口‘, zip=‘518002
第3个值为: UserInfo[userid=3, userName=‘王某某‘, sex=‘female‘, birthday=2006-08-10 00:00:00.0, address=Address[addressid=3, city=‘深圳‘, street=‘四季花城‘, zip=‘518003
第4个值为: UserInfo[userid=4, userName=‘陈某某‘, sex=‘male‘, birthday=2006-08-12 00:00:00.0, address=Address[addressid=3, city=‘深圳‘, street=‘四季花城‘, zip=‘518003
新增一条数据后进行查询
连接数据库耗时: 0毫秒
第1个值为: UserInfo[userid=1, userName=‘张金雄‘, sex=‘male‘, birthday=null, address=Address[addressid=1, city=‘深圳‘, street=‘坂田市场‘, zip=‘518001
第2个值为: UserInfo[userid=2, userName=‘李某某‘, sex=‘male‘, birthday=null, address=Address[addressid=2, city=‘深圳‘, street=‘坂田路口‘, zip=‘518002
第3个值为: UserInfo[userid=3, userName=‘王某某‘, sex=‘female‘, birthday=2006-08-10 00:00:00.0, address=Address[addressid=3, city=‘深圳‘, street=‘四季花城‘, zip=‘518003
第4个值为: UserInfo[userid=4, userName=‘陈某某‘, sex=‘male‘, birthday=2006-08-12 00:00:00.0, address=Address[addressid=3, city=‘深圳‘, street=‘四季花城‘, zip=‘518003
第5个值为: UserInfo[userid=6, userName=‘张某某‘, sex=‘male‘, birthday=2014-11-20 20:24:09.102, address=Address[addressid=6, city=‘深圳‘, street=‘坂田‘, zip=‘518000
修改一条数据后进行查询
连接数据库耗时: 0毫秒
第1个值为: UserInfo[userid=1, userName=‘张金雄‘, sex=‘male‘, birthday=null, address=Address[addressid=1, city=‘深圳‘, street=‘坂田市场‘, zip=‘518001
第2个值为: UserInfo[userid=2, userName=‘李某某‘, sex=‘male‘, birthday=null, address=Address[addressid=2, city=‘深圳‘, street=‘坂田路口‘, zip=‘518002
第3个值为: UserInfo[userid=3, userName=‘王某某‘, sex=‘female‘, birthday=2006-08-10 00:00:00.0, address=Address[addressid=3, city=‘深圳‘, street=‘四季花城‘, zip=‘518003
第4个值为: UserInfo[userid=4, userName=‘陈某某‘, sex=‘male‘, birthday=2006-08-12 00:00:00.0, address=Address[addressid=3, city=‘深圳‘, street=‘四季花城‘, zip=‘518003
第5个值为: UserInfo[userid=6, userName=‘哈哈‘, sex=‘male‘, birthday=2014-11-20 20:24:09.102, address=Address[addressid=6, city=‘深圳‘, street=‘坂田2‘, zip=‘518000
删除一条数据后进行查询
连接数据库耗时: 0毫秒
第1个值为: UserInfo[userid=1, userName=‘张金雄‘, sex=‘male‘, birthday=null, address=Address[addressid=1, city=‘深圳‘, street=‘坂田市场‘, zip=‘518001
第2个值为: UserInfo[userid=2, userName=‘李某某‘, sex=‘male‘, birthday=null, address=Address[addressid=2, city=‘深圳‘, street=‘坂田路口‘, zip=‘518002
第3个值为: UserInfo[userid=3, userName=‘王某某‘, sex=‘female‘, birthday=2006-08-10 00:00:00.0, address=Address[addressid=3, city=‘深圳‘, street=‘四季花城‘, zip=‘518003
第4个值为: UserInfo[userid=4, userName=‘陈某某‘, sex=‘male‘, birthday=2006-08-12 00:00:00.0, address=Address[addressid=3, city=‘深圳‘, street=‘四季花城‘, zip=‘518003

完整工程源代码

下载地址：

参考文档

  1. 在Java SE环境下使用JPA1.0(1)

  2. Toplink JPA简介

Maven 版 JPA 最佳实践

标签：style   blog   http   io   ar   os   使用   sp   java   

原文地址：http://www.cnblogs.com/ctoroad/p/4111447.html
踩
(0)
赞
(0)
   
举报
评论 一句话评论（0）
登录后才能评论！
分享档案
更多>
2021年07月29日 (22)
2021年07月28日 (40)
2021年07月27日 (32)
2021年07月26日 (79)
2021年07月23日 (29)
2021年07月22日 (30)
2021年07月21日 (42)
2021年07月20日 (16)
2021年07月19日 (90)
2021年07月16日 (35)
周排行
mamicode.com排行更多图片
更多
友情链接
兰亭集智   国之画   百度统计   站长统计   阿里云   chrome插件   新版天听网
关于我们 - 联系我们 - 留言反馈
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码！