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首页/文章专栏/慕课网_《轻松愉快之玩转SpringData》学习总结

慕课网_《轻松愉快之玩转SpringData》学习总结

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摘要：时间年月日星期一说明本文部分内容均来自慕课网。慕课网教学示例源码个人学习源码第一章课程介绍课程介绍什么是主旨提供一个熟悉的一致的，基于框架的数据访问框架。

时间：2017年04月24日星期一
说明：本文部分内容均来自慕课网。@慕课网：http://www.imooc.com
教学示例源码：https://github.com/zccodere/s...
个人学习源码：https://github.com/zccodere/s...

第一章：课程介绍 1-1 课程介绍

什么是Spring Data

主旨：提供一个熟悉的、一致的，基于Spring框架的数据访问框架。
简化数据库的访问。
历史：2010年提出，作者Rod Johnso，Spring Source项目
网址：http://projects.spring.io/spring-data/#quick-start

Spring Data概览

Spring Data包含多个子项目

Spring Data JPA
Spring Data Mongo DB
Spring Data Redis
Spring Data Solr

课程安排

传统方式访问数据库
Spring Data快速起步
Spring Data JPA进阶
Spring Data JPA高级
第二章：使用传统方式访问数据库 2-1 使用传统方式访问数据库

传统方式访问数据库

JDBC
Spring JdbcTemplate
弊端分析
2-2 准备工作

JDBC

Connection
Statement
ResultSet
Test Case

搭建开发环境

创建maven项目
添加数据库驱动和单元测试依赖
数据库表的准备，使用mysql数据库

创建一个Java项目，POM文件如下：


  4.0.0

  com.zccoder
  myspringdata
  1.0-SNAPSHOT

  
    UTF-8
  

  
    
    
      org.springframework
      spring-jdbc
      4.3.6.RELEASE
    
    
      org.springframework
      spring-context
      4.3.6.RELEASE
    
    
    
      org.springframework.data
      spring-data-jpa
      1.11.3.RELEASE
    
   
      org.hibernate
    hibernate-entitymanager
    5.2.10.Final
  
    
    
      mysql
      mysql-connector-java
      5.1.38
    
    
    
      junit
      junit
      4.10
      test

完成后的项目结构图：

2-3 JDBCUtil开发

开发JDBCUtil工具类

获取Connection，关闭Connection、Statement、ResultSet
注意事项：配置的属性放置配置文件中，然后通过代码的方式将配置文件中的数据加载进来即可。

代码示例：

package com.myimooc.springdata.jdbc.util;

import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

/**
 * JDBC工具类：
 * 1）获取Connection
 * 2）释放资源
 * Created by ZC on 2017/4/24.
 */
public class JDBCUtils {

    /**
     * 获取Connection
     * @return 所获得到的JDBC的Connection
     */
    public static Connection getConnection() throws Exception{
        /**
         * 不建议大家把配置硬编码到代码中
         * 最佳实践：配置性的建议写到配置文件中
         * */
//        String url = "jdbc:mysql:///springdata";
//        String username = "root";
//        String password = "root";
//        String dirverClass = "com.mysql.jdbc.Driver";

        InputStream inputStream =  JDBCUtils.class.getClassLoader().getResourceAsStream("db.properties");
        Properties properties = new Properties();
        properties.load(inputStream);

        String url = properties.getProperty("jdbc.url");
        String username = properties.getProperty("jdbc.username");
        String password = properties.getProperty("jdbc.password");
        String driverClass = properties.getProperty("jdbc.driverClass");

        Class.forName(driverClass);
        Connection connection = DriverManager.getConnection(url,username,password);
        return connection;
    }

    /**
     * 释放DB相关资源
     * @param resultSet
     * @param statement
     * @param connection
     */
    public static void release(ResultSet resultSet, Statement statement,Connection connection){
        if(resultSet != null ){
            try {
                resultSet.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(statement != null ){
            try {
                statement.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if(connection != null ){
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

}
2-4 Dao开发

建立对象模型及DAO层开发。

代码演示：

1、对象模型

package com.myimooc.springdata.jdbc.domain;

/**
 * Student实体类
 * Created by ZC on 2017/4/24.
 */
public class Student {
    /** 主键ID */
    private Integer id;
    /** 姓名 */
    private String name;
    /** 年龄 */
    private int age;

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name="" + name + """ +
                ", age=" + age +
                "}";
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

2、DAO接口

package com.myimooc.springdata.jdbc.dao;

import com.myimooc.springdata.jdbc.domain.Student;

import java.util.List;

/**
 * StudentDAO访问接口
 * Created by ZC on 2017/4/24.
 */
public interface StudentDao {
    /**
     * 获取所有学生
     * @return 所有学生
     */
    List listStudent();

    /**
     * 添加一个学生
     * @param student 待添加的学生
     */
    void saveStudent(Student student);
}

3、DAO实现

package com.myimooc.springdata.jdbc.dao.impl;

import com.myimooc.springdata.jdbc.dao.StudentDao;
import com.myimooc.springdata.jdbc.domain.Student;
import com.myimooc.springdata.jdbc.util.JDBCUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;

/**
 * StudentDAO访问接口实现类：通过最原始的JDBC的方式操作
 * Created by ZC on 2017/4/24.
 */
public class StudentDaoImpl implements StudentDao {

    public List listStudent() {
        List studentList = new ArrayList();

        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        String sql = "select id,name,age from student";
        try {
            connection = JDBCUtils.getConnection();
            preparedStatement = connection.prepareStatement(sql);
            resultSet = preparedStatement.executeQuery();

            while(resultSet.next()){
                Integer id = resultSet.getInt("id");
                String name = resultSet.getString("name");
                Integer age = resultSet.getInt("age");

                Student student = new Student();
                student.setId(id);
                student.setName(name);
                student.setAge(age);

                studentList.add(student);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            JDBCUtils.release(resultSet,preparedStatement,connection);
        }
        return studentList;
    }

    public void saveStudent(Student student) {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        String sql = "insert into student(name,age) values(?,?)";
        try {
            connection = JDBCUtils.getConnection();
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1,student.getName());
            preparedStatement.setInt(2,student.getAge());

            preparedStatement.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            JDBCUtils.release(resultSet,preparedStatement,connection);
        }
    }
}

4、单元测试

package com.myimooc.springdata.jdbc.dao;

import com.myimooc.springdata.jdbc.dao.impl.StudentDaoImpl;
import com.myimooc.springdata.jdbc.domain.Student;
import org.junit.Test;

import java.util.List;

/**
 * StudentDao 单元测试类
 * Created by ZC on 2017/4/24.
 */
public class StudentDaoImplTest {

    @Test
    public void listStudentTest(){
        StudentDao studentDao = new StudentDaoImpl();

        List  studentList = studentDao.listStudent();
        for(Student student : studentList){
            System.out.println(student.toString());
        }
    }

    @Test
    public void saveStudentTest(){
        StudentDao studentDao = new StudentDaoImpl();

        Student student = new Student();
        student.setName("test");
        student.setAge(30);

        studentDao.saveStudent(student);
    }

}
2-5 使用JdbcTemplate

Spring JdbcTemplate

添加maven依赖
DataSource & JdbcTemplate注入
Test Case

代码演示：

1、创建DB配置文件

jdbc.url = jdbc:mysql:///springdata
jdbc.username = root
jdbc.password = root
jdbc.driverClass = com.mysql.jdbc.Driver

2、创建配置文件类

package com.myimooc.springdata.jdbctemplate.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.ImportResource;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

/**
 * 配置参数类
 * Created by ZC on 2017/4/24.
 */
@PropertySource(value="classpath:db.properties")
@Component
public class Properties {
    @Value("${jdbc.driverClass}")
    private String jdbcDriverClass;
    @Value("${jdbc.url}")
    private String jdbcUrl;
    @Value("${jdbc.username}")
    private String jdbcUser;
    @Value("${jdbc.password}")
    private String jdbcPassword;

    @Override
    public String toString() {
        return "Properties{" +
                "jdbcDriverClass="" + jdbcDriverClass + """ +
                ", jdbcUrl="" + jdbcUrl + """ +
                ", jdbcUser="" + jdbcUser + """ +
                ", jdbcPassword="" + jdbcPassword + """ +
                "}";
    }

    public String getJdbcDriverClass() {
        return jdbcDriverClass;
    }

    public String getJdbcUrl() {
        return jdbcUrl;
    }

    public String getJdbcUser() {
        return jdbcUser;
    }

    public String getJdbcPassword() {
        return jdbcPassword;
    }
}

3、配置DataSource、JdbcTemplate和Spring注解扫描

package com.myimooc.springdata.jdbctemplate.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

/**
 * Created by ZC on 2017/4/24.
 */
@Configuration
@ComponentScan("com.myimooc.springdata.jdbctemplate")
public class SpringConfig {

    @Autowired
    private Properties properties;

    @Bean
    DriverManagerDataSource getDriverManagerDataSource(){
        DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
        driverManagerDataSource.setDriverClassName(properties.getJdbcDriverClass());
        driverManagerDataSource.setUrl(properties.getJdbcUrl());
        driverManagerDataSource.setUsername(properties.getJdbcUser());
        driverManagerDataSource.setPassword(properties.getJdbcPassword());
        return driverManagerDataSource;
    }

    @Bean
    JdbcTemplate getJdbcTemplate(){
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        jdbcTemplate.setDataSource(getDriverManagerDataSource());
        return jdbcTemplate;
    }
}

4、编写实体类

package com.myimooc.springdata.jdbctemplate.domain;

/**
 * Student实体类
 * Created by ZC on 2017/4/24.
 */
public class Student {
    /** 主键ID */
    private Integer id;
    /** 姓名 */
    private String name;
    /** 年龄 */
    private int age;

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name="" + name + """ +
                ", age=" + age +
                "}";
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

5、DAO接口

package com.myimooc.springdata.jdbctemplate.dao;

import com.myimooc.springdata.jdbctemplate.domain.Student;

import java.util.List;

/**
 * StudentDAO访问接口
 * Created by ZC on 2017/4/24.
 */
public interface StudentDao {
    /**
     * 获取所有学生
     * @return 所有学生
     */
    List listStudent();

    /**
     * 添加一个学生
     * @param student 待添加的学生
     */
    void saveStudent(Student student);
}

6、DAO实现

package com.myimooc.springdata.jdbctemplate.dao.impl;

import com.myimooc.springdata.jdbctemplate.dao.StudentDao;
import com.myimooc.springdata.jdbctemplate.domain.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * StudentDAO访问接口实现类：通过 JdbcTemplate 的方式操作
 * Created by ZC on 2017/4/24.
 */
@Repository
public class StudentDaoImpl implements StudentDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    public List listStudent() {
        List studentList = new ArrayList();
        String sql = "select id, name, age from student";
        List>  mapList = jdbcTemplate.queryForList(sql);
        for (Map mapTemp : mapList) {
            Integer id = Integer.parseInt(mapTemp.get("id").toString());
            String name = mapTemp.get("name").toString();
            Integer age = Integer.parseInt(mapTemp.get("age").toString());

            Student student = new Student();
            student.setId(id);
            student.setName(name);
            student.setAge(age);

            studentList.add(student);
        }
        return studentList;
    }

    public void saveStudent(Student student) {
        String sql = "insert into student(name, age) value(?,?)";
        jdbcTemplate.update(sql,student.getName(),student.getAge());
    }
}

7、单元测试类

package com.myimooc.springdata.jdbctemplate;

import com.myimooc.springdata.jdbctemplate.config.SpringConfig;
import com.myimooc.springdata.jdbctemplate.dao.StudentDao;
import com.myimooc.springdata.jdbctemplate.domain.Student;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

import javax.sql.DataSource;
import java.util.List;

/**
 *  使用 JdbcTemplate 实现 StudentDao 单元测试类
 * Created by ZC on 2017/4/24.
 */
public class StudentDaoTest {

    private ApplicationContext ctx = null;
    private StudentDao studentDao;

    @Before
    public void init(){
        ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        studentDao = ctx.getBean(StudentDao.class);
    }

    @After
    public void destroy(){
        ctx = null;
    }

    @Test
    public void listStudentTest(){
        List studentList = studentDao.listStudent();
        for (Student student : studentList){
            System.out.println(student.toString());
        }
    }

    @Test
    public void saveTest(){
        Student student = new Student();
        student.setName("test-spring-jdbcTemplate");
        student.setAge(25);
        studentDao.saveStudent(student);
    }

}
2-6 弊端分析

弊端分析

DAO里面代码量太多
DAO的实现有很多重复代码
开发分页和其它功能，需要重新进行封装
第三章：Spring Data快速入门 3-1 开发环境搭建

Spring Data JPA快速起步

开发环境搭建
Spring Data JPA HelloWorld开发

代码演示：

1、创建DB配置文件

jdbc.url = jdbc:mysql:///springdata
jdbc.username = root
jdbc.password = root
jdbc.driverClass = com.mysql.jdbc.Driver

2、创建配置文件类

package com.myimooc.springdata.jpa.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;

/**
 * Created by ZC on 2017/4/24.
 */
@PropertySource(value="classpath:db.properties")
@Component
public class PropertiesConfig {
    @Value("${jdbc.driverClass}")
    private String jdbcDriverClass;
    @Value("${jdbc.url}")
    private String jdbcUrl;
    @Value("${jdbc.username}")
    private String jdbcUser;
    @Value("${jdbc.password}")
    private String jdbcPassword;

    @Override
    public String toString() {
        return "Properties{" +
                "jdbcDriverClass="" + jdbcDriverClass + """ +
                ", jdbcUrl="" + jdbcUrl + """ +
                ", jdbcUser="" + jdbcUser + """ +
                ", jdbcPassword="" + jdbcPassword + """ +
                "}";
    }

    public String getJdbcDriverClass() {
        return jdbcDriverClass;
    }

    public String getJdbcUrl() {
        return jdbcUrl;
    }

    public String getJdbcUser() {
        return jdbcUser;
    }

    public String getJdbcPassword() {
        return jdbcPassword;
    }
}

3、配置TransactionManager、EntityManagerFactory和Spring自动扫描注入

package com.myimooc.springdata.jpa.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.Database;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import java.util.Properties;

/**
 * Spring配置类
 * Created by ZC on 2017/4/24.
 */
// 声明为配置类
@Configuration
// 启用事务管理
@EnableTransactionManagement
// 启用自动扫描继承 JpaRepository 接口的类。
// 注意，此注解需要配置 entityManagerFactory 和 transactionManager
// 方式一：定义获取Bean方法名为 entityManagerFactory 和 transactionManager
// 方式二：配置 @EnableJpaRepositories注解的 entityManagerFactoryRef 属性 为自定义获取Bean的方法名。
@EnableJpaRepositories(basePackages = "com.myimooc.springdata.jpa")
// 启用自动扫描 @Component 注解的Bean
@ComponentScan(basePackages = "com.myimooc.springdata.jpa")
public class SpringConfig{

    @Autowired
    private PropertiesConfig propertiesConfig;

    /**
     * 配置数据源
     * @return
     */
    @Bean
    public DriverManagerDataSource dataSource(){
        DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
        driverManagerDataSource.setDriverClassName(propertiesConfig.getJdbcDriverClass());
        driverManagerDataSource.setUrl(propertiesConfig.getJdbcUrl());
        driverManagerDataSource.setUsername(propertiesConfig.getJdbcUser());
        driverManagerDataSource.setPassword(propertiesConfig.getJdbcPassword());
        return driverManagerDataSource;
    }


    /**
     * 配置事务管理器 JpaTransactionManager
     * @return
     */
    @Bean(name="transactionManager")
    public PlatformTransactionManager transactionManager(){
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setDataSource(this.dataSource());
        transactionManager.setEntityManagerFactory(this.entityManagerFactory().getObject());
        return transactionManager;
//        return new DataSourceTransactionManager(this.dataSource());
//        return new JpaTransactionManager(this.entityManagerFactory().getObject());
    }

    /**
     * 配置JPA的 EntityManagerFactory
     * @return
     */
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(){
        LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactory.setDataSource(dataSource());

        HibernateJpaVendorAdapter jpaVendorAdapter = new HibernateJpaVendorAdapter();
        jpaVendorAdapter.setGenerateDdl(true);
        jpaVendorAdapter.setDatabase(Database.MYSQL);
        entityManagerFactory.setJpaVendorAdapter(jpaVendorAdapter);

        entityManagerFactory.setPackagesToScan("com.myimooc.springdata.jpa");

        Properties jpaProperties = new Properties();
//        jpaProperties.setProperty("hibernate.ejb.naming_strategy","org.hibernate.cfg.ImprovedNamingStrategy");
        jpaProperties.setProperty("hibernate.dialect","org.hibernate.dialect.MySQL5InnoDBDialect");
        jpaProperties.setProperty("hibernate.show_sql","true");
        jpaProperties.setProperty("hibernate.format_sql","true");
        jpaProperties.setProperty("hibernate.hbm2ddl.auto","update");

        entityManagerFactory.setJpaProperties(jpaProperties);

        return entityManagerFactory;
    }

}

4、编写实体类：Employee

package com.myimooc.springdata.jpa.domain;

import javax.persistence.*;

/**
 * 雇员：先开发实体类，然后自动生成实体表
 * Created by ZC on 2017/4/24.
 */
@Entity
@Table(name = "test_employee")
public class Employee {
    @Id
    @GeneratedValue
    private Integer id;

    @Column(length = 20)
    private String name;

    private Integer age;

    @Override
    public String toString() {
        return "Employee{" +
                "id=" + id +
                ", name="" + name + """ +
                ", age=" + age +
                "}";
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}
3-2 起步程序开发

代码演示：

1、编写EmployeeRepository接口

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.domain.Employee;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.Repository;
import org.springframework.data.repository.query.Param;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * 使用 Repository 接口
 * Created by ZC on 2017/4/25.
 */
// 方式二：使用 @RepositoryDefinition 注解
//  @RepositoryDefinition(domainClass = Employee.class,idClass = Integer.class)
public interface EmployeeRepository extends Repository {//方式一：继承 Repository 接口

    /**
     * 获取雇员对象通过名称
     * @param name
     * @return
     */
    Employee findByName(String name);
}

2、编写单元测试类：EmployeeRepositoryTest

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.config.SpringConfig;
import com.myimooc.springdata.jpa.domain.Employee;
import com.myimooc.springdata.jpa.repository.EmployeeRepository;
import com.myimooc.springdata.jpa.service.EmployeeService;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;

import java.util.ArrayList;
import java.util.List;

/**
 * EmployeeRepository单元测试类
 * Created by ZC on 2017/4/24.
 */
public class EmployeeRepositoryTest {

    private ApplicationContext ctx = null;
    private EmployeeRepository employeeRepository = null;

    @Before
    public void init(){
        ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        employeeRepository = ctx.getBean(EmployeeRepository.class);
    }

    @After
    public void destroy(){
        ctx = null;
    }

    @Test
    public void entityManageFactoryTest(){
        LocalContainerEntityManagerFactoryBean entityManagerFactory = (LocalContainerEntityManagerFactoryBean)ctx.getBean(LocalContainerEntityManagerFactoryBean.class);
        Assert.assertNotNull(entityManagerFactory);
    }

    @Test
    public void findByNameTest(){
        System.out.println(employeeRepository);
        Employee employee = employeeRepository.findByName("cc");
        if( null == employee){
            System.out.println("查询数据为空");
        }else{
            System.out.println(employee.toString());
        }
    }
}

Repository

Repository：Spring Data核心类
RepositoryDefinition：使用该注解进行配置
Repository Query Specification：查询时，方法命名不能乱写
Query Annotation：使用该注解，可以实现原生SQL查询
Update/Delete/Transaction：更新、删除操作，支持事务

Repository Hierarchy

CrudRepository：内置了新增、更新、删除、查询方法
PagingAndSortingRespository：分页和排序
JpaRepository
JpaSpecificationExcutor
第四章：Spring Data JPA进阶 4-1 关于Repository接口

Repository接口详解

Repository接口是Spring Data的核心接口，不提供任何方法
public interface Repository{}
@RepositoryDefinition注解的使用

Repository类的定义：

1）Repository是一个空接口，标记接口。没有包含方法声明的接口
2）如果我们定义的接口EmployeeRepository extends Repository，会被Spring管理。
    如果我们自己的接口没有extends Repository，运行时会报错，没有这个Bean。
4-2 Repository子接口详解

Repository子接口详解

CrudRepository：继承Repository，实现了CRUD相关的方法
PagingAndSortingRepository：继承CrudRepository，实现了分页排序相关的方法
JpaRepository：继承PagingAndSortingRepositor，实现JPA规范相关的方法
4-3 查询方法定义规则和使用

Repository中查询方法定义规则和使用

了解Spring Data中查询方法名称的定义规则
使用Spring Data完成复杂查询方法名称的命名

查询方法定义规则

代码演示：

1、在EmployeeRepository接口编写以下代码

    // 使用JPA规范查询

    // where name like ?% and age < ?
    List findByNameStartingWithAndAgeLessThan(String name,Integer age);

    // where name like %? and age < ?
    List findByNameEndingWithAndAgeLessThan(String name,Integer age);

    // where name in (?,?...) or age < ?
    List findByNameInOrAgeLessThan(List name,Integer age);

    // where name in (?,?...) and age < ?
    List findByNameInAndAgeLessThan(List name,Integer age);

2、在EmployeeRepositoryTest单元测试类进行测试

@Test
    public void findByNameStartingWithAndAgeLessThanTest(){
        System.out.println(employeeRepository);
        List employees = employeeRepository.findByNameStartingWithAndAgeLessThan("test",22);

        if( null != employees){
            for (Employee employee : employees) {
                System.out.println(employee.toString());
            }
        }else{
            System.out.println("查询数据为空");
        }
    }

    @Test
    public void findByNameEndingWithAndAgeLessThanTest(){
        System.out.println(employeeRepository);
        List employees = employeeRepository.findByNameEndingWithAndAgeLessThan("6",23);

        if( null != employees && employees.size() > 0){
            for (Employee employee : employees) {
                System.out.println(employee.toString());
            }
        }else{
            System.out.println("查询数据为空");
        }
    }

    @Test
    public void findByNameInOrAgeLessThanTest(){
        List names = new ArrayList();
        names.add("test1");
        names.add("test2");
        names.add("test3");
        List employees = employeeRepository.findByNameInOrAgeLessThan(names,22);

        if( null != employees && employees.size() > 0){
            for (Employee employee : employees) {
                System.out.println(employee.toString());
            }
        }else{
            System.out.println("查询数据为空");
        }
    }

    @Test
    public void findByNameInAndAgeLessThanTest(){
        List names = new ArrayList();
        names.add("test1");
        names.add("test2");
        names.add("test3");
        List employees = employeeRepository.findByNameInAndAgeLessThan(names,22);

        if( null != employees && employees.size() > 0){
            for (Employee employee : employees) {
                System.out.println(employee.toString());
            }
        }else{
            System.out.println("查询数据为空");
        }
    }

对于按照方法命名规则来使用的话，有弊端：

1）方法名比较长：约定大于配置
2）对于一些复杂的查询，是很难实现。

使用@Query注解来解决。

4-4 Query注解使用

Query注解使用

在Respository方法中使用，不需要遵循查询方法命令规则
只需要将@Query定义在Respository中的方法之上即可
命名参数及索引参数的使用
本地查询

代码演示：

1、在EmployeeRepository接口编写以下代码

// 使用@Query注解查询

    /**
     * 自定义查询SQL
     * */
    @Query("select o from Employee o where id=(select max(id) from Employee t1)")
    Employee getEmployeeByMaxId();

    /**
     * 使用占位符进行参数绑定
     * */
    @Query("select o from Employee o where o.name=?1 and o.age=?2")
    List listEmployeeByNameAndAge(String name, Integer age);

    /**
     * 使用命名参数进行参数绑定
     * */
    @Query("select o from Employee o where o.name=:name and o.age=:age")
    List listEmployeeByNameAndAge2(@Param("name") String name, @Param("age")Integer age);

    /**
     * 自定义查询SQL，like,占位符进行参数绑定
     * */
    @Query("select o from Employee o where o.name like %?1%")
    List listEmployeeByLikeName(String name);

    /**
     * 自定义查询SQL，like,命名参数进行参数绑定
     * */
    @Query("select o from Employee o where o.name like %:name%")
    List listEmployeeByLikeName2(@Param("name") String name);

    /**
     * 使用原生态SQL查询
     * @return
     */
    @Query(nativeQuery = true,value = "select count(1) from employee")
    long getCount();

2、在EmployeeRepositoryTest单元测试类进行测试

//  使用 @Query 注解查询
    @Test
    public void getEmployeeByMaxIdTest(){

        Employee employee = employeeRepository.getEmployeeByMaxId();

        if( null != employee ){
                System.out.println(employee.toString());
        }else{
            System.out.println("查询数据为空");
        }
    }

    @Test
    public void listEmployeeByNameAndAgeTest(){
        List employees = employeeRepository.listEmployeeByNameAndAge("zhangsan",20);
        if( null != employees && employees.size() > 0){
            for (Employee employee : employees) {
                System.out.println(employee.toString());
            }
        }else{
            System.out.println("查询数据为空");
        }
    }

    @Test
    public void listEmployeeByNameAndAge2Test(){
        List employees = employeeRepository.listEmployeeByNameAndAge2("zhangsan",20);
        if( null != employees && employees.size() > 0){
            for (Employee employee : employees) {
                System.out.println(employee.toString());
            }
        }else{
            System.out.println("查询数据为空");
        }
    }

    @Test
    public void listEmployeeByLikeNameTest(){
        List employees = employeeRepository.listEmployeeByLikeName("test1");
        if( null != employees && employees.size() > 0){
            for (Employee employee : employees) {
                System.out.println(employee.toString());
            }
        }else{
            System.out.println("查询数据为空");
        }
    }

    @Test
    public void listEmployeeByLikeName2Test(){
        List employees = employeeRepository.listEmployeeByLikeName2("test");
        if( null != employees && employees.size() > 0){
            for (Employee employee : employees) {
                System.out.println(employee.toString());
            }
        }else{
            System.out.println("查询数据为空");
        }
    }

    @Test
    public void getCountTest(){
        long count = employeeRepository.getCount();
        System.out.println(count);
    }
4-5 更新操作整合事务使用

更新及删除操作整合事务的使用

@Modifying注解使用
@Modifying结合@Query注解执行更新操作
@Transaction在Spring Data中的使用

事务在Spring data中的使用：

1）事务一般是在Service层
2）@Query、@Modifying、@Transaction的综合使用

代码演示：

1、基于javaconfig在SpringConfig类进行事务配置

package com.myimooc.springdata.jpa.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.Database;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;

import java.util.Properties;

/**
 * Spring配置类
 * Created by ZC on 2017/4/24.
 */
// 声明为配置类
@Configuration
// 启用事务管理
@EnableTransactionManagement
// 启用自动扫描继承 JpaRepository 接口的类。
// 注意，此注解需要配置 entityManagerFactory 和 transactionManager
// 方式一：定义获取Bean方法名为 entityManagerFactory 和 transactionManager
// 方式二：配置 @EnableJpaRepositories注解的 entityManagerFactoryRef 属性 为自定义获取Bean的方法名。
@EnableJpaRepositories(basePackages = "com.myimooc.springdata.jpa")
// 启用自动扫描 @Component 注解的Bean
@ComponentScan(basePackages = "com.myimooc.springdata.jpa")
public class SpringConfig{

    @Autowired
    private PropertiesConfig propertiesConfig;

    /**
     * 配置数据源
     * @return
     */
    @Bean
    public DriverManagerDataSource dataSource(){
        DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
        driverManagerDataSource.setDriverClassName(propertiesConfig.getJdbcDriverClass());
        driverManagerDataSource.setUrl(propertiesConfig.getJdbcUrl());
        driverManagerDataSource.setUsername(propertiesConfig.getJdbcUser());
        driverManagerDataSource.setPassword(propertiesConfig.getJdbcPassword());
        return driverManagerDataSource;
    }


    /**
     * 配置事务管理器 JpaTransactionManager
     * @return
     */
    @Bean(name="transactionManager")
    public PlatformTransactionManager transactionManager(){
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setDataSource(this.dataSource());
        transactionManager.setEntityManagerFactory(this.entityManagerFactory().getObject());
        return transactionManager;
//        return new DataSourceTransactionManager(this.dataSource());
//        return new JpaTransactionManager(this.entityManagerFactory().getObject());
    }

    /**
     * 配置JPA的 EntityManagerFactory
     * @return
     */
    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(){
        LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
        entityManagerFactory.setDataSource(dataSource());

        HibernateJpaVendorAdapter jpaVendorAdapter = new HibernateJpaVendorAdapter();
        jpaVendorAdapter.setGenerateDdl(true);
        jpaVendorAdapter.setDatabase(Database.MYSQL);
        entityManagerFactory.setJpaVendorAdapter(jpaVendorAdapter);

        entityManagerFactory.setPackagesToScan("com.myimooc.springdata.jpa");

        Properties jpaProperties = new Properties();
//        jpaProperties.setProperty("hibernate.ejb.naming_strategy","org.hibernate.cfg.ImprovedNamingStrategy");
        jpaProperties.setProperty("hibernate.dialect","org.hibernate.dialect.MySQL5InnoDBDialect");
        jpaProperties.setProperty("hibernate.show_sql","true");
        jpaProperties.setProperty("hibernate.format_sql","true");
        jpaProperties.setProperty("hibernate.hbm2ddl.auto","update");

        entityManagerFactory.setJpaProperties(jpaProperties);

        return entityManagerFactory;
    }

}

2、在EmployeeRepository接口编写以下代码

    // 更新数据
    @Transactional
    @Modifying
    @Query("update Employee o set o.age = :age where o.id = :id")
    void updateAgeById(@Param("id")Integer id,@Param("age")Integer age);

3、定义Service层，实际开发中，需要定义接口，这里为了演示方便，直接使用类。

package com.myimooc.springdata.jpa.service;

import com.myimooc.springdata.jpa.domain.Employee;
import com.myimooc.springdata.jpa.repository.EmployeeCrudRepository;
import com.myimooc.springdata.jpa.repository.EmployeeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;


/**
 * Created by ZC on 2017/4/25.
 */
@Service
public class EmployeeService {

    @Autowired
    private EmployeeRepository employeeRepository;

    @Autowired
    private EmployeeCrudRepository employeeCrudRepository;

    @Transactional
    public void updateAgeById(Integer id, Integer age){
        this.employeeRepository.updateAgeById(id,age);
    };

    @Transactional
    public void save(List employees){
        this.employeeCrudRepository.save(employees);
    }
}

4、编写EmployeeService单元测试类

package com.myimooc.springdata.jpa.service;

import com.myimooc.springdata.jpa.config.SpringConfig;
import com.myimooc.springdata.jpa.repository.EmployeeRepository;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;

/**
 * EmployeeService单元测试类
 * Created by ZC on 2017/4/25.
 */
public class EmployeeServiceTest {

    private ApplicationContext ctx = null;
    private EmployeeService employeeService = null;

    @Before
    public void init(){
        ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        employeeService = ctx.getBean(EmployeeService.class);
    }

    @After
    public void destroy(){
        ctx = null;
    }

    @Test
    public void transactionManagerTest(){
        PlatformTransactionManager transactionManager = (PlatformTransactionManager)ctx.getBean(PlatformTransactionManager.class);
        Assert.assertNotNull(transactionManager);
    }

    // 更新操作

    @Test
    public void updateAgeByIdTest(){
        employeeService.updateAgeById(1,55);
    }

}
第五章：Spring Data JPA高级 5-1 CrudRepository接口使用详解

CrudRepository接口使用详解

save(entity)：保存一个实体
save(entities)：保存多个实体
findOne(id)：找到一个对象
exists(id)：根据ID判断对象是否存在
findAll()：找到所有实体对象
delete(id)：根据ID删除实体对象
delete(entity)：根据实体对象删除实体对象
delete(entities)：删除多个实体对象
deleteAll()：删除所有实体对象

代码演示：

1、编写EmployeeCrudRepository接口

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.domain.Employee;
import org.springframework.data.repository.CrudRepository;

/**
 * 使用 CrudRepository 接口
 * Created by ZC on 2017/4/26.
 */
public interface EmployeeCrudRepository extends CrudRepository{

}

2、编写EmployeeCrudRepositoryTest单元测试类

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.config.SpringConfig;
import com.myimooc.springdata.jpa.domain.Employee;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import java.util.ArrayList;
import java.util.List;

/**
 * EmployeeRepository单元测试类
 * Created by ZC on 2017/4/24.
 */
public class EmployeeCrudRepositoryTest {

    private ApplicationContext ctx = null;
    private EmployeeCrudRepository employeeCrudRepository = null;

    @Before
    public void init(){
        ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        employeeCrudRepository = ctx.getBean(EmployeeCrudRepository.class);
    }

    @After
    public void destroy(){
        ctx = null;
    }

    @Test
    public void saveTest(){
        List employees = new ArrayList();
        Employee employee = null;
        for(int i=0;i<100;i++){
            employee = new Employee();
            employee.setName("test"+i);
            employee.setAge(100 - i);
            employees.add(employee);
        }
        employeeCrudRepository.save(employees);
    }

}
5-2 PagingAndSortingRespository接口使用详解

PagingAndSortingRespository接口使用详解

该接口包含分页和排序的功能
带排序的查询：findAll(Sort sort)
带排序的分页查询：findAll(Pageable pageable)

代码演示：

1、编写EmployeePagingAndSortingRepository接口

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.domain.Employee;
import org.springframework.data.repository.PagingAndSortingRepository;

/**
 * 使用 PagingAndSortingRepository 实现分页和排序功能
 * Created by ZC on 2017/4/26.
 */
public interface EmployeePagingAndSortingRepository extends PagingAndSortingRepository {
}

2、编写EmployeePagingAndSortingRepositoryTest单元测试类

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.config.SpringConfig;
import com.myimooc.springdata.jpa.domain.Employee;
import com.myimooc.springdata.jpa.repository.EmployeePagingAndSortingRepository;
import com.myimooc.springdata.jpa.service.EmployeeService;
import org.junit.After;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.repository.PagingAndSortingRepository;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;

import java.util.ArrayList;
import java.util.List;

/**
 * PagingAndSortingRepository 单元测试类
 * Created by ZC on 2017/4/26.
 */
public class EmployeePagingAndSortingRepositoryTest {

    private ApplicationContext ctx = null;
    private EmployeePagingAndSortingRepository employeePagingAndSortingRepository = null;

    @Before
    public void init(){
        ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        employeePagingAndSortingRepository = ctx.getBean(EmployeePagingAndSortingRepository.class);
    }

    @After
    public void destroy(){
        ctx = null;
    }

    /**
     * 分页功能测试
     */
    @Test
    public void pageTest(){
        // page: index是从0开始的，不是从1开始的
        Pageable pageable = new PageRequest(0,9);
        Page employeePage = employeePagingAndSortingRepository.findAll(pageable);

        System.out.println("查询的总页数："+employeePage.getTotalPages());
        System.out.println("查询的总记录数："+employeePage.getTotalElements());
        System.out.println("查询的当前第几页："+(employeePage.getNumber() + 1));
        System.out.println("查询的当前页面的集合："+employeePage.getContent());
        System.out.println("查询的当前页面的记录数："+employeePage.getNumberOfElements());

    }

    /**
     * 分页和排序功能测试
     */
    @Test
    public void pageAndSort(){
        Sort.Order order = new Sort.Order(Sort.Direction.ASC,"id");
        Sort sort = new Sort(order);
        // page: index是从0开始的，不是从1开始的
        Pageable pageable = new PageRequest(0,5,sort);
        Page employeePage = employeePagingAndSortingRepository.findAll(pageable);

        System.out.println("查询的总页数："+employeePage.getTotalPages());
        System.out.println("查询的总记录数："+employeePage.getTotalElements());
        System.out.println("查询的当前第几页："+(employeePage.getNumber() + 1));
        System.out.println("查询的当前页面的集合："+employeePage.getContent());
        System.out.println("查询的当前页面的记录数："+employeePage.getNumberOfElements());
    }

}
5-3 JpaRepository接口使用详解

JpaRepository接口使用详解

finaAll：查询所有记录
findAll(Sort sort)：查询所有记录并排序
save(entities)：保存多个实体对象
fiush：
deleteInBatch(entities)：一个批次里面删除那些实体

代码演示：

1、编写EmployeeJpaRepository接口

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.domain.Employee;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.PagingAndSortingRepository;

/**
 * 使用 JpaRepository 接口
 * Created by ZC on 2017/4/26.
 */
public interface EmployeeJpaRepository extends JpaRepository {
}

2、编写EmployeeJpaRepositoryTest单元测试类

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.config.SpringConfig;
import com.myimooc.springdata.jpa.domain.Employee;
import com.myimooc.springdata.jpa.repository.EmployeeJpaRepository;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.PagingAndSortingRepository;

/**
 * EmployeeJpaRepository 单元测试类
 * Created by ZC on 2017/4/26.
 */
public class EmployeeJpaRepositoryTest {

    private ApplicationContext ctx = null;
    private EmployeeJpaRepository employeeJpaRepository = null;

    @Before
    public void init(){
        ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        employeeJpaRepository = ctx.getBean(EmployeeJpaRepository.class);
    }

    @After
    public void destroy(){
        ctx = null;
    }

    @Test
    public void findTest(){
        Employee employee = employeeJpaRepository.findOne(99);
        System.out.println("employee"+employee.toString());

        System.out.println("employee(10)"+employeeJpaRepository.exists(10));
        System.out.println("employee(102)"+employeeJpaRepository.exists(102));
    }

}
5-4 JpaSpecificationExecutor接口使用详解

JpaSpecificationExecutor接口使用详解

Specification封装了JPA Criteria查询条件

代码演示：

1、编写EmployeeJpaSpecificationExecutor接口

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.domain.Employee;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;

/**
 * 使用 JpaSpecificationExecutor 接口
 * Created by ZC on 2017/4/26.
 */
public interface EmployeeJpaSpecificationExecutor extends JpaRepository ,
        JpaSpecificationExecutor{
}

2、编写EmployeeJpaSpecificationExecutorTest单元测试类

package com.myimooc.springdata.jpa.repository;

import com.myimooc.springdata.jpa.config.SpringConfig;
import com.myimooc.springdata.jpa.domain.Employee;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;

import javax.persistence.criteria.*;

/**
 * EmployeeJpaSpecificationExecutor 单元测试类
 * Created by ZC on 2017/4/26.
 */
public class EmployeeJpaSpecificationExecutorTest {

    private ApplicationContext ctx = null;
    private EmployeeJpaSpecificationExecutor employeeJpaSpecificationExecutor = null;

    @Before
    public void init(){
        ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
        employeeJpaSpecificationExecutor = ctx.getBean(EmployeeJpaSpecificationExecutor.class);
    }

    @After
    public void destroy(){
        ctx = null;
    }

    /**
     * 1、分页
     * 2、排序
     * 3、查询条件:age > 50
     */
    @Test
    public void queryTest(){
        Sort.Order order = new Sort.Order(Sort.Direction.DESC,"id");
        Sort sort = new Sort(order);
        // page: index是从0开始的，不是从1开始的
        Pageable pageable = new PageRequest(0,5,sort);

        /**
         * root : 就是我们要查询的类型 (Employee)
         * query : 添加查询条件
         * cb : 构建 Predicate
         */
        Specification specification = new Specification() {
            // 查询条件
            public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder cb) {
                // root (employee (age))
                Path path = root.get("age");
                return cb.gt(path,50);
            }
        };

        Page employeePage = employeeJpaSpecificationExecutor.findAll(specification,pageable);

        System.out.println("查询的总页数："+employeePage.getTotalPages());
        System.out.println("查询的总记录数："+employeePage.getTotalElements());
        System.out.println("查询的当前第几页："+(employeePage.getNumber() + 1));
        System.out.println("查询的当前页面的集合："+employeePage.getContent());
        System.out.println("查询的当前页面的记录数："+employeePage.getNumberOfElements());

    }

}
第六章：课程总结 6-4 课程总结

课程总结

Spring Data概览
传统方式访问数据库
Spring Data快速起步
Spring Data JPA进阶
Spring Data JAP高级
GPU服务器 私有云 慕课网 慕课网webrtc webrtc慕课网 javascript慕课网

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