Kotlin，JPA和@Transient

Question

我有一个Entity类，我已经从Java迁移到Kotlin。其中一个属性（inetAddress）使用@Transient进行注释，以防止它被持久化到关系数据库。但是，JPA（Hibernate实现）没有看到这个注释，而是将它作为自己的字段放在数据库中。当用Java编写类时，这一切都能正常工作。

有没有人知道如何正确注释这个Kotlin类，以便JPA / Hibernate会看到@Transient注释而不将inetAddress属性放在数据库中？

package infr.audio.model

import com.fasterxml.jackson.annotation.JsonIgnore
import com.fasterxml.jackson.annotation.JsonProperty
import infr.audio.messages.InetAddressWrapper
import java.io.Serializable
import java.net.InetAddress
import javax.persistence.Column
import javax.persistence.Entity
import javax.persistence.GeneratedValue
import javax.persistence.Id
import javax.persistence.NamedQueries
import javax.persistence.NamedQuery
import javax.persistence.Table

@Entity
@Table(name = "DIS_JOCKEY")
@NamedQueries(NamedQuery(name = "DisJockeyInfo.find", query = "SELECT m FROM DisJockeyInfo m"), NamedQuery(name = "DisJockeyInfo.findByReservationId", query = "SELECT m FROM DisJockeyInfo m WHERE m.reservationId = :reservationId"), NamedQuery(name = "DisJockeyInfo.findByReservationIdAndName", query = "SELECT m FROM DisJockeyInfo m WHERE m.reservationId = :reservationId AND m.name = :name"), NamedQuery(name = "DisJockeyInfo.findMaxDisEntityIdByReservationId", query = "SELECT MAX(m.disEntityId) FROM DisJockeyInfo m WHERE m.reservationId = :reservationId"), NamedQuery(name = "DisJockeyInfo.findActive", query = "SELECT m FROM DisJockeyInfo m WHERE m.disEntityId IS NOT NULL"), NamedQuery(name = "DisJockeyInfo.findActiveByInetAddress", query = "SELECT m FROM DisJockeyInfo m WHERE m.inetAddress = :inetAddress AND m.disEntityId IS NOT NULL"), NamedQuery(name = "DisJockeyInfo.findActiveByReservationId", query = "SELECT m FROM DisJockeyInfo m WHERE m.reservationId = :reservationId AND m.disEntityId IS NOT NULL"), NamedQuery(name = "DisJockeyInfo.deleteInactive", query = "DELETE FROM DisJockeyInfo m WHERE m.id = :id AND m.disEntityId IS NULL"))
data class DisJockeyInfo(
        @get:Id
        @get:GeneratedValue(strategy = GenerationType.IDENTITY)
        @get:Column(name = "ID")
        var id: Long,
        @get:Column(name = "RESERVATION_ID")
        var reservationId: String?,
        @get:Column(name = "NAME")
        var name: String?,
        @get:Column(name = "DIS_ENTITY_ID")
        var disEntityId: Long?,
        @get:java.beans.Transient
        @get:JsonIgnore
        @field:Transient
        var inetAddress: InetAddress?    
) : GenericEntity, Serializable {

    var inetAddressString: String?
        @Column(name = "INET_ADDRESS")
        @JsonProperty("inetAddress")
        get() = if (inetAddress != null) InetAddressWrapper(inetAddress).encodedInetAddress else null
        set(inetAddressString) {
            inetAddress = if (inetAddressString != null) InetAddressWrapper(inetAddressString).inetAddress else null
        }

    constructor() : this(id = 0L, reservationId = null, name = null, disEntityId = null, inetAddress = null) {}

    companion object {
        /** Serial version */
        private val serialVersionUID = 2027355982760360935L
    }
}

Answer 1

您正在注释该字段而不是注释getter。请注意，您的getter注释使用了错误的类型（java.beans.Transient），而不是正确的javax.persistence.Transient。

Answer 2

只需添加：

import javax.persistence.Transient

Answer 3

使用@Transient 和 import kotlin.jvm.Transient 帮助了我。 （或只是@kotlin.jvm.Transient） https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.jvm/-transient/