Question

我在我的Spring Boot应用程序中使用Kotlin，并且在使用Spring-JPA。我已经这样定义了我的实体

@Entity
@Table(name = "customer")
data class Customer(

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    val id: Long? = null,

    @NotNull
    @Size(max = 255)
    @Column
    val firstName: String,

    @NotNull
    @Size(max = 255)
    @Column
    val lastName: String,

    @NotNull
    @Size(max = 255)
    @Column
    val email: String,

    @NotNull
    @Temporal(TemporalType.TIMESTAMP)
    val createdAt: Date,

    @Temporal(TemporalType.TIMESTAMP)
    val updatedAt: Date? = null
)

@Repository
interface CustomerRepository : CrudRepository<Customer, Long> {
   fun findById(id: Long): Customer
}

@Service
class MyService(private val repository: CustomerRepository) {


   fun update(id: Long, firstName: String, lastName: String, email: String):Customer {
       val customer = repository.findById(id)
       return repository.save(customer.copy(firstName=firstName, lastName=lastName, email=email)) // the reason for the copy as the attributes are val
   }
}

以上示例是处理更新的一种方法。另一种方法是使实体使用var而不是val，以便可以对其进行修改。在Kotlin中推荐的方法是什么？

在Kotlin中更新存储库的惯用方式

0 个答案: