Spring-data-jpa 在 Spring 中使用

//引入gradle以来
implementation 'org.springframework.boot:spring-boot-starter-data-jpa'


//application.properties 写入数据库配置
spring.datasource.url=jdbc:mysql://49.234.00.000:3306/new_schema
spring.datasource.username=zzzz
spring.datasource.password=zzzz
spring.datasource.driver-class-name=com.mysql.jdbc.Driver


//查找所有数据
@Resource
private CoffeeService coffeeService;
coffeeService.findAllCoffee()
↓
//注入Repository
@Resource
private CoffeeRepository coffeeRepository;

public List<Coffee> findAllCoffee() {
return coffeeRepository.findAll();
}
↓
//继承JpaRepository
import org.springframework.data.jpa.repository.JpaRepository;
import redis.demo.model.Coffee;

public interface CoffeeRepository extends JpaRepository<Coffee, Long> {
}
↓
//定义Coffee类
@EqualsAndHashCode(callSuper = true)
@Entity
@Table(name = "T_COFFEE")
@Builder
@Data
@ToString(callSuper = true)
@NoArgsConstructor
@AllArgsConstructor
public class Coffee extends BaseEntity implements Serializable {
private String name;

//gradle 引入
//implementation 'org.jadira.usertype:usertype.core:6.0.1.GA'
@Type(type = "org.jadira.usertype.moneyandcurrency.joda.PersistentMoneyMinorAmount",
parameters = {@org.hibernate.annotations.Parameter(name = "currencyCode", value = "CNY")})
private Money price;
}
↓
//定义BaseEntity
@MappedSuperclass
@Data
@NoArgsConstructor
@AllArgsConstructor
public class BaseEntity implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(updatable = false)
@CreationTimestamp
private Date createTime;
@UpdateTimestamp
private Date updateTime;
}