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:

目录结构

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