是否可以使用 Quarkus 在 JPA 中使用复合主键？

Question

如何使用 Quarkus JPA 声明复合密钥？

尝试@Id在@EntityQuarkus的类中使用多个注释，会导致错误：

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，在声明之后

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

没有上述声明，就没有投诉，但没有可能主动管理Property.

如何规避这个错误？

我正在处理两个 JPA 实体：
1. 第一个命名Entity（不要误认为注释）
2. 第二个命名Property

AnEntity可以有 0..n 个Property. 代码如下：

@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

---

如下声明复合主键@EmbeddedId并不能解决问题，因为 Quarkus 目前不允许其他注释，而不是@Id这种情况：

@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，您的实体必须扩展 PanacheEntityBase 并使用类级别注释 @Table、@Entity、@IdClass(PK.class)，其中 Pk 是具有复合主键字段的 POJO，那么您必须使用以下方式声明相同的字段实体中的 @Id 注释。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