Spring Data JPA的开发步骤

Spring Data JPA是简化基于JPA和Spring整合应用开发，从此之后，持久层无需实现类，只需接口即可！

1.  导入spring data  jpa座标

<dependency>

             <groupId>org.springframework.data</groupId>

             <artifactId>spring-data-jpa</artifactId>

  </dependency>

2.  配置applicationContext.xml

1）先加入jpa的命令空间：

 

<?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:aop="http://www.springframework.org/schema/aop"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xmlns:jpa="http://www.springframework.org/schema/data/jpa"

    xsi:schemaLocation="http://www.springframework.org/schema/beans

    http://www.springframework.org/schema/beans/spring-beans.xsd

    http://www.springframework.org/schema/context

    http://www.springframework.org/schema/context/spring-context.xsd

    http://www.springframework.org/schema/aop

    http://www.springframework.org/schema/aop/spring-aop.xsd

    http://www.springframework.org/schema/tx

    http://www.springframework.org/schema/tx/spring-tx.xsd

    http://www.springframework.org/schema/data/jpa 

    http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">

 

2）配置spring data jpa：

<!-- spring data jpa的Dao接口的包扫描

         base-package:

    -->

    <jpa:repositories base-package="com.itheima.bos.dao"/>

 

3.  改造Dao接口

package com.itheima.bos.dao.base;

 

import org.springframework.data.jpa.repository.JpaRepository;

 

import com.itheima.bos.domain.base.Standard;

/**

 *

 * 参数一：需要操作的实体类型

 * 参数二：实体里面的主键属性类型

 */

public   interface StandardDao   extends JpaRepository<Standard, Long>{

}

 

 

4.  编写测试类

package com.itheima.test;

 

import javax.annotation.Resource;

 

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.test.annotation.Rollback;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import org.springframework.transaction.annotation.Transactional;

 

import com.itheima.bos.dao.base.StandardDao;

import com.itheima.bos.domain.base.Standard;

 

@RunWith(SpringJUnit4ClassRunner.class) // 导入Spring环境

@ContextConfiguration("classpath:applicationContext.xml") // 加载applicationContext.xml配置文件

publicclass StandardDaoTest {

 

    //注入dao

    @Resource

    private StandardDao standardDao;

   

    @Test

    @Transactional// 在测试方式里面使用事务管理，注意：@Transactional用在@Test方法里面，事务会自动回滚的

    @Rollback(false) //   取消自动回滚

    publicvoid testSave(){

         Standard standard = new Standard();

         standard.setName("10-20斤");

         standard.setMinWeight(10L);

         standard.setMaxWeight(20L);

         standard.setMinLength(1000L);

         standard.setMaxLength(2000L);

        

         standardDao.save(standard);

    }

}