JPA 7.Spring整合JPA
JPA
@Author:hanguixian
@Email:hn_hanguixian@163.com
七 Spring 整合 JPA
三种整合方式
LocalEntityManagerFactoryBean：适用于那些仅使用 JPA 进行数据访问的项目，该 FactoryBean 将根据JPA PersistenceProvider 自动检测配置文件进行工作，一般从“META-INF/persistence.xml”读取配置信息，这种方式最简单，但不能设置 Spring 中定义的DataSource，且不支持 Spring 管理的全局事务
从JNDI中获取：用于从 Java EE 服务器获取指定的EntityManagerFactory，这种方式在进行 Spring 事务管理时一般要使用 JTA 事务管理
LocalContainerEntityManagerFactoryBean：适用于所有环境的 FactoryBean，能全面控制 EntityManagerFactory 配置,如指定 Spring 定义的 DataSource 等等。
示例:
- pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ifox.hgx</groupId>
<artifactId>jpa_ Integrated_spring</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>jpa_ Integrated_spring Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-web -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>5.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.13.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-entitymanager -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.13.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
</dependencies> - 数据库连接信息:db.properties
jdbc.url = jdbc:mysql://localhost:3306/JPA jdbc.user = root jdbc.password = 123456 jdbc.driverClass = com.mysql.jdbc.Driver
- spring配置:applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--配置自动扫描的包-->
<context:component-scan base-package="com.ifox.hgx.jpa.spring"></context:component-scan>
<!--配置 c3p0数据源-->
<context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<bean class="com.mchange.v2.c3p0.ComboPooledDataSource" id="dataSource">
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!-- 配置 EntityManagerFactory -->
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<!-- 配置 JPA 提供商的适配器. 可以通过内部 bean 的方式来配置 -->
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean>
</property>
<!-- 配置实体类所在的包 -->
<property name="packagesToScan" value="com.ifox.hgx.jpa.spring.entities"></property>
<!-- 配置 JPA 的基本属性. 例如 JPA 实现产品的属性 -->
<property name="jpaProperties">
<props>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>
<!-- 配置 JPA 使用的事务管理器 -->
<bean id="transactionManager"
class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"></property>
</bean>
<!-- 配置支持基于注解是事务配置 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans> - Person.java 实体类
@Table(name = "JPA_PERSON")
@Entity
public class Person {
private Integer id ;
private String lastName ;
private String email ;
private Integer age ;
public Person() {
}
public Person(String lastName, String email, Integer age) {
this.lastName = lastName;
this.email = email;
this.age = age;
}
// @GeneratedValue(strategy = GenerationType.IDENTITY)
@GeneratedValue
@Id
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(name = "LAST_NAME")
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "Person{" +
"id=" + id +
", lastName='" + lastName + '\'' +
", email='" + email + '\'' +
", age=" + age +
'}';
}
}
- Dao层:PersonDao
package com.ifox.hgx.jpa.spring.dao;
import com.ifox.hgx.jpa.spring.entities.Person;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
@Repository
public class PersonDao {
//标注成员变量
@PersistenceContext
private EntityManager entityManager ;
@Transactional
public void save(Person person){
entityManager.persist(person);
}
}
- Service层: PersonService
package com.ifox.hgx.jpa.spring.service;
import com.ifox.hgx.jpa.spring.dao.PersonDao;
import com.ifox.hgx.jpa.spring.entities.Person;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class PersonService {
@Autowired
private PersonDao personDao ;
public void save(Person person, Person person2){
personDao.save(person);
personDao.save(person2);
}
}
- 测试类:JPATest
package com.ifox.hgx.jap.spring;
import com.ifox.hgx.jpa.spring.entities.Person;
import com.ifox.hgx.jpa.spring.service.PersonService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import javax.sql.DataSource;
import java.sql.Connection;
public class JPATest {
private ApplicationContext applicationContext = null ;
private PersonService personService = null ;
{
applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml") ;
personService = applicationContext.getBean(PersonService.class) ;
}
@Test
public void testDataSource() throws Exception{
DataSource dataSource = applicationContext.getBean(DataSource.class) ;
Connection connection = dataSource.getConnection();
System.out.println(connection);
}
@Test
public void testPersonSave(){
Person person = new Person("AAA","12132@qq.com",13) ;
Person person1 = new Person("BBB","12312@qq.com",23) ;
personService.save(person,person1);
}
} - 目录结构:
