笔记|Jap技术总结 spring|boot|intellij-idea|java

文章目录

JPA技术
1. Springboot整合JPA
- 1.1 引入JPA
- 1.2配置
- 1.3 启动类
- 1.4 实体类
- 1.5 定义接口和数据库交互(dao)
- 1.6 建立service（增删改查）接口，并实现
- 1.7 测试
- 1.8Test(⊙o⊙)结果

JPA技术

Java Persistence Api(ORM 全自动化框架)

1. Springboot整合JPA 1.1 引入JPA

org.springframework.boot spring-boot-starter-data-jpa

1.2配置

server: port: 8099#数据源配置 spring: datasource: druid: url: jdbc:mysql://localhost:3306/mybatis_db?useUnicode=true&characterEncoding=utf8&useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true username: root password: 1234 driver-class-name: com.mysql.cj.jdbc.Driver #json时间处理 jackson: date-format: yyyy-MM-dd HH:mm:ss time-zone: GMT+8 #jpa全自动框架 jpa: hibernate: ddl-auto: update show-sql: truelogging: level: com.dyit.springboot: debug

1.3 启动类

@SpringBootApplication public class Main {public static void main(String[] args) { SpringApplication.run(Main.class); } }

1.4 实体类

映射数据库的表

@Entity @Table(name = "Person_tab") @Data @NoArgsConstructor @AllArgsConstructor public class Person {@Id @GeneratedValue(strategy = GenerationType.IDENTITY)//根据数据库的主键策略（id自增） @Column(name="person_id") private Integer id; @Column(name="person_name") private String name; @Column(name="person_gender") private String gender; @Column(name="person_age") private Integer age; @Column(name="person_phone") private String phone; }

1.5 定义接口和数据库交互(dao)

@Repository public interface IPersonDao extends CrudRepository { Person findByPhone(String phone); }

1.6 建立service（增删改查）接口，并实现

接口

public interface IPersonService { void add(Person person); void update(Person person); List findAll(); Person findByphone(String phone); }

实现

@Service @Transactional public class PersonServiceImpl implements IPersonService { @Autowired private IPersonDao dao; @Override public void add(Person person) {dao.save(person); }@Override public void update(Person person) { dao.save(person); }@Override public List findAll() {return (List) dao.findAll(); }@Override public Person findByphone(String phone) { return dao.findByPhone(phone); } }

1.7 测试

鼠标在service实现类后（PersonServiceImpl implements IPersonService），用快捷键Alt+回车，创建Test类

@RunWith(SpringJUnit4ClassRunner.class) @SpringBootTest @Slf4j public class PersonServiceImplTest {@Autowired private IPersonService ips; @Test public void add() {ips.add(new Person(null,"齐斯","男",22,"1234567")); }@Test public void update() { ips.update(new Person(1,"齐齐","男",22,"12345677")); }@Test public void findAll() { log.debug("findAll:"+ips.findAll()); }@Test public void findByphone() { System.out.println("1234567"); } }

1.8Test(⊙o⊙)结果