Spring Data JPA的開發步驟

Spring Data JPA是簡化基於JPA和Spring整合應用開發，從此之後，持久層無需實現類，只需接口即可！

1.  導入spring data  jpa座標

<dependency>

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

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

  </dependency>

2.  配置applicationContext.xml

1）先加入jpa的命令空間：

 

<?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接口的包掃描

         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;

/**

 *

 * 參數一：需要操作的實體類型

 * 參數二：實體裏面的主鍵屬性類型

 */

public   interface StandardDao   extends JpaRepository<Standard, Long>{

}

 

 

4.  編寫測試類

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) // 導入Spring環境

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

publicclass StandardDaoTest {

 

    //注入dao

    @Resource

    private StandardDao standardDao;

   

    @Test

    @Transactional// 在測試方式裏面使用事務管理，注意：@Transactional用在@Test方法裏面，事務會自動回滾的

    @Rollback(false) //   取消自動回滾

    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);

    }

}