使用 Quarkus 的 JPA 中的復合主鍵是否可行？

Question

如何使用 Quarkus JPA 聲明復合鍵？

嘗試在帶有 Quarkus 的@Entity class 中使用多個@Id注釋，會導致錯誤：

Currently the @Id annotation can only be placed on a single field or method. Offending class is abc.model.Property
    at io.quarkus.spring.data.deployment.generate.StockMethodsAdder.getIdAnnotationTargetRec(StockMethodsAdder.java:940)

但首先，在聲明之后

interface PropertyRepository : CrudRepository<Property, Pair<String, abc.model.Entity>>

沒有上述聲明，就沒有投訴，但沒有可能主動管理Property的實例。

如何規避這個錯誤？

我正在處理兩個 JPA 實體：
1.第一個名為Entity （不要誤認為是注解）
2.第二個叫Property

一個Entity可以有 0..n 個Property實例。 代碼如下：

@Entity
data class Entity (
        @Id
        @Column(name = "entity_id", updatable = false)
        var entityId: String? = null,

        @Column(nullable = true)
        var type: String? = null
) {
    @OneToMany(mappedBy = "entity")
    var properties: List<Property>? = null
}

@Entity
data class Property (
        @Id
        @Column(name = "type")
        var type: String? = null,

        @Id
        @ManyToOne
        @JoinColumn(name = "entity_id")
        private var entity: abc.model.Entity? = null
) : Serializable

---

如下將復合主鍵聲明為@EmbeddedId並不能解決問題，因為 Quarkus 目前在這種情況下不允許使用除@Id之外的其他注釋：

@Entity
data class Entity (
        @Id
        @Column(name = "entity_id", updatable = false)
        var entityId: String? = null,

        @Column(nullable = true)
        var type: String? = null
) {
    @OneToMany(mappedBy = "propertyId.entityId")
    var properties: List<Property>? = null
}

interface PropertyRepository : CrudRepository<Property, PropertyId>

@Embeddable
data class PropertyId (
        var type: String? = null,

        @Column(name = "entity_id")
        private var entityId: String? = null
) : Serializable

@Entity
data class Property (
        @EmbeddedId
        var propertyId: PropertyId? = null,

        @Column(name = "constant_value")
        var constantValue: String? = null
)

java.lang.IllegalArgumentException: Currently only Entities with the @Id annotation are supported. Offending class is abc.model.Property
    at io.quarkus.spring.data.deployment.generate.StockMethodsAdder.getIdAnnotationTargetRec(StockMethodsAdder.java:932)

Answer 1

有可能，您的實體必須擴展 PanacheEntityBase 並使用 class 級別注釋 @Table,@Entity,@IdClass(PK.class)，其中 Pk 是具有復合主鍵字段的 POJO，然后您必須聲明相同的字段實體中的 @Id 注釋。 例如：

@Entity()
@Table(name = "agent")
@IdClass(AgentPK.class)
public class AgentBRA extends PanacheEntityBase {

   @Id
   public Integer idUsuario;
   @Id
   public Integer idAgent;

和 AgentPk：

public class AgentPK implements Serializable{

   protected Integer idUsuario;

   protected Integer idAgent;
   // getters setters and hascode and equals methods