springboot整合spring data jpa

一,新建项目导入maven依赖

XML 复制代码

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- springBoot JPA的起步依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <!-- MySQL连接驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!-- 配置使用redis启动器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

    </dependencies>

二,创建配置文件

XML 复制代码

logging:
  level:
    com.atguigu.dao: debug # 配置日志
spring:
  datasource:
    username: root
    password: root
    url: jdbc:mysql://127.0.0.1:3306/springboot?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
    driver-class-name: com.mysql.cj.jdbc.Driver
  jpa:
    database: mysql
    show-sql: true
    generate-ddl: true
    hibernate:
      ddl-auto: update
      naming_strategy: org.hibernate.cfg.ImprovedNamingStrategy
server:
  port: 1808

三,创建实体配置实体

java 复制代码

@Entity
@Table(name = "user")
public class User{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private Long id;
    @Column(name = "username")
    private String username;
    @Column(name = "password")
    private String password;
    @Column(name = "name")
    private String name;
 
    //此处省略setter和getter方法... ...
}

四,编写Dao层

java 复制代码

package com.atguigu.dao;

import com.atguigu.domain.User;
import org.springframework.data.jpa.repository.JpaRepository;

public interface UserDao extends JpaRepository<User,Long> {
}

五,编写service

1.接口

java 复制代码

public interface UserService {
    List<User> findUsers();

    User findUserById(Long id);

    void saveUser(User user);

    void updateUser(User user);

    void deleteUserById(Long id);
}

2.实现类

java 复制代码

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    /**
     * 查询所有
     * @return
     */
    @Override
    public List<User> findUsers() {
        return userDao.findAll();
    }
    /**
     * 根据id查询
     * @return
     */
    @Override
    public User findUserById(Integer id) {
        return userDao.findById(id).get();
    }
    /**
     * 保存
     * @return
     */
    @Override
    public void saveUser(User user) {
        userDao.save(user);
    }
    /**
     * 更新
     * @return
     */
    @Override
    public void updateUser(User user) {
        userDao.save(user);
    }
    /**
     * 根据id删除
     * @return
     */
    @Override
    public void deleteUserById(Integer id) {
        userDao.deleteById(id);
    }
}

六,编写controller

java 复制代码

import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/findAll")
    public List<User> findAll(){
        return userService.findUsers();
    }
}

七,编写主启动类测试

注意：

自动生成的表的存储引擎是MyISAM，此引擎不支持事务，需要该为InnoDB,

创建hibernate.properties配置文件添加以下配置

hibernate.dialect.storage_engine=innodb

删除表重写启动服务器