-
pom.xml 添加 mysql 和 jpa 等依賴。
-
application.yml:添加數據庫連接信息(默認使用hikari高性能連接池)
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/test?useSSL=false
username: root
password: root
jpa:
hibernate:
# create:drop and create,會刪除原內容,危險
# create-drop:關閉程序後刪除表,危險
# update:不刪除數據,只更改表結構
# none:什麼都不做
# validate:驗證entity和 表結構,不一致報錯
ddl-auto: validate
- 添加 entity 實體類(數據庫需創建對應表或使用hibernate自動生成),JsonIgnoreProperties註解:避免hibernate懶加載與jackson衝突
@Entity
@JsonIgnoreProperties(value = {"hibernateLazyInitializer", "handler", "fieldHandler"})
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
public Long getId() { return id; }
public String getName() { return name; }
public void setId(Long id) { this.id = id; }
public void setName(String name) { this.name = name; }
}
- 新建 repository 接口
public interface UserRepository extends JpaRepository<User, Long> {
public List<User> findByName(String name);
}
- 添加 service ,注入 repository
@Service
public class UserService {
@Autowired UserRepository userRepository;
public List<User> findByName(String name) {
return userRepository.findByName(name);
}
}