这篇文章将为大家详细讲解有关在Spring框架中如何集成JPA实例，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
Hibernate 3.2支持JPA注解，Spring集成JPA是可选的。
实体类MyUser，使用JPA注解实现到数据库表myUser的映射，如下所示：
package org.shirdrn.entity;import java.util.Date;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Transient;@Entity
public class MyUser {private Long id;
private String userName;
private String password;
private String gender;
private Integer age;
private Integer birthYear;
private String addr;
private String email;@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Long getId() {
return id;
}public void setId(Long id) {
this.id = id;
}@Column(name="userName")
public String getUserName() {
return userName;
}public void setUserName(String userName) {
this.userName = userName;
}@Column(name="password")
public String getPassword() {
return password;
}public void setPassword(String password) {
this.password = password;
}@Column(name="gender")
public String getGender() {
return gender;
}public void setGender(String gender) {
this.gender = gender;
}@Column(name="age")
public Integer getAge() {
return age;
}public void setAge(Integer age) {
this.age = age;
}@Column(name="addr")
public String getAddr() {
return addr;
}public void setAddr(String addr) {
this.addr = addr;
}@Column(name="email")
public String getEmail() {
return email;
}public void setEmail(String email) {
this.email = email;
}@Transient
public Integer getBirthYear() {
return new Integer(2008-age);
}public void setBirthYear(Integer age) {
this.birthYear = new Integer(2008-age);
}
} |
其中，birthYear不是数据库中的字段，使用JPA的@Transient注解，在映射的时候，会忽略掉该成员。
持久层DAO接口如下：
package org.shirdrn.dao;import java.util.List;import org.shirdrn.entity.MyUser;
import org.springframework.transaction.annotation.Transactional;@Transactional
public interface MyUserDAO {
public void createMyUser(MyUser myUser);
public void deleteMyUser(MyUser myUser);
public void updateMyUser(MyUser myUser);
public List |
这里，使用了JPA注解，声明事务。
DAO实现类，如下所示：
package org.shirdrn.dao.impl;import java.util.List;import org.shirdrn.dao.MyUserDAO;
import org.shirdrn.entity.MyUser;
import org.springframework.orm.jpa.support.JpaDaoSupport;public class MyUserDAOImpl extends JpaDaoSupport implements MyUserDAO {public void createMyUser(MyUser myUser) {
getJpaTemplate().persist(myUser);
}public void deleteMyUser(MyUser myUser) {
MyUser dbMyUser = getJpaTemplate().find(MyUser.class, myUser.getId());
getJpaTemplate().remove(dbMyUser);
}public void updateMyUser(MyUser myUser) {
MyUser dbMyUser = getJpaTemplate().find(MyUser.class, myUser.getId());
if(myUser.getUserName() != null){
dbMyUser.setUserName(myUser.getUserName());
}
if(myUser.getAddr() != null){
dbMyUser.setAddr(myUser.getAddr());
}
getJpaTemplate().merge(dbMyUser);
}@SuppressWarnings("unchecked")
public List@SuppressWarnings("unchecked")
public List |
因为继承了JpaDaoSupport，索引需要获取一个JpaTemplate来实现访问数据库，在Spring的配置文件中要注入一个org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean。
Spring的配置文件applicationContext.xml的内容如下所示：
<BEANSXMLNS="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"><BEANID="MYUSERDAOIMPL"CLASS="ORG.SHIRDRN.DAO.IMPL.MYUSERDAOIMPL"abstract="false"lazy-init="default"autowire="default"dependency-check="default"> |
在META-INF目录下，还要加一个persistence.xml配置文件，如下所示：
<PERSISTENCEXMLNS="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">org.hibernate.ejb.HibernatePersistenceorg.shirdrn.entity.MyUser |
接着，对增删改查操作进行测试，如下所示：
插入记录：
packageorg.shirdrn.test; importorg.shirdrn.dao.MyUserDAO; importorg.shirdrn.entity.MyUser; importorg.springframework.context.ApplicationContext; importorg.springframework.context.support.ClassPathXmlApplicationContext; publicclassTestCreateMyUser{publicstaticvoidmain(String[]args){
MyUserDAOmyUserDAO=(MyUserDAO)ctx.getBean("myUserDAOImpl");
MyUsermyUser=newMyUser();
myUser.setUserName("JohnXa");
myUser.setPassword("123456");
myUser.setGender("男");
myUser.setAge(newInteger(25));
myUser.setAddr("NewYork");
myUser.setEmail("john@hotmail.com");
myUserDAO.createMyUser(myUser);
}
} |
删除记录：
packageorg.shirdrn.test; importorg.shirdrn.dao.MyUserDAO; importorg.shirdrn.entity.MyUser; importorg.springframework.context.ApplicationContext; importorg.springframework.ClassPathXmlApplicationContext; publicclassTestDeleteMyUser{
publicstaticvoidmain(String[]args){
ApplicationContextctx=newClassPathXml("applicationContext.xml");
MyUserDAOmyUserDAO=(MyUserDAO)ctx.getBean("myUserDAOImpl");
MyUsermyUser=newMyUser();
myUser.setId(newLong(29));
myUserDAO.deleteMyUser(myUser); |
修改记录：
packageorg.shirdrn.test; importorg.shirdrn.dao.MyUserDAO; importorg.shirdrn.entity.MyUser; importorg.springframework.context.ApplicationContext; importorg.springframework.context.ClassPathXmlApplicationContext; publicclassTestUpdateMyUser{ |
查询记录：
packageorg.shirdrn.test; importjava.util.List; importorg.shirdrn.dao.MyUserDAO; importorg.shirdrn.entity.MyUser; importorg.springframework.context.ApplicationContext; importorg.springframework.context.ClassPathXmlApplicationContext; publicclassTestQueryAllMyUser{
publicstaticvoidmain(String[]args){
ApplicationContextctx=newClassPathXmContext("applicationContext.xml");
MyUserDAOmyUserDAO=(MyUserDAO)ctx.getBean("myUserDAOImpl");
List |
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