springboot入门——集成SpringDataJPA

1. 添加Spring Data JPA的起步依赖

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

2. 添加数据库驱动依赖

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

3. 配置数据库和jpa的相关属性（application.properties）

# 数据库连接信息
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://172.20.10.13:3306/test?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=11250825

# JPA Configuration:
spring.jpa.database=MySQL
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy

4. 创建实体（domain——User.java）

@Data
@Entity
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String username;
    private String password;
    private String name;
}

5. repository——UserRepository.java

public interface UserRepository extends JpaRepository<User, Long> {
    public List<User> findAll();
}

6. 编写测试类

@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootJpaApplication.class)
public class JpaTest {

    @Autowired
    private UserRepository userRepository;

    @Test
    public void test() {
        List<User> all = userRepository.findAll();
        System.out.println(all);
    }
}

7. 测试即可。

对比上一篇博文，可以发现，使用JPA后，省去了sql语句和mapper。