spring data jpa 链接mysql简单事例

创建表

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for userinfo
-- ----------------------------
DROP TABLE IF EXISTS `userinfo`;
CREATE TABLE `userinfo` (
  `id` int NOT NULL AUTO_INCREMENT,
  `name` varchar(30) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

SET FOREIGN_KEY_CHECKS = 1;

创建工程

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

数据库配置

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true&useSSL=false
    username: root
    password: 123456
  jpa:
    database: Mysql
    database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
    show-sql: true
    hibernate:
      ddl-auto: update

创建表映射的实体类

@Entity
@Table(name = "userinfo")
public class Userinfo implements Serializable {
    
    

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="id")
    private Integer id;
    @Column(name="name")
    private String name;

    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;
    }

    @Override
    public String toString() {
    
    
        StringBuffer sb = new StringBuffer();
        sb.append("id = " + id);
        sb.append("name = " + name);
        return sb.toString();
    }
}

创建Dao层

@Repository
public interface UsersRepository extends JpaRepository<Userinfo, Integer> {
    
    

    List<Userinfo> findByName(String name);
}

测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class RepositoryTest  {
    
    

    @Autowired
    private UsersRepository usersRepository;

    @Test
    public void userSave(){
    
    
        Userinfo userinfo = new Userinfo();
        userinfo.setName("里斯");
        usersRepository.save(userinfo);

    }
}