Java 复合密钥部分的JPA连接

我尝试用JPA连接两个表

第一个表与实体ReportTripSingle关联 第二个表与实体TripData关联 第二个表的主键用复合键（实体TripDataPK）描述

实体TripDataPK 实体数据 实体报告单 正如你所看到的，我想加入ReportTripSingle和TripData

它不起作用：(

以下是堆栈跟踪：

原因：org.hibernate.AnnotationException: 的引用列名称（FTP\U ID） com.nexo.susan.be.model.ReportTripSingle.tripData引用 com.nexo.susan.be.model.TripData未映射到 org.hibernate.cfg.BinderHelper.createSyntheticPropertyReference（BinderHelper.java:336） 在 org.hibernate.cfg.ToOneFkSecondPass.doSecondPass（ToOneFkSecondPass.java:116） 在 org.hibernate.cfg.Configuration.processEndOfQueue（Configuration.java:1522） 在 org.hibernate.cfg.Configuration.processFkSecondPassInOrder（Configuration.java:1443） 在 secondPassCompile（Configuration.java:1346） 在 org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1737）

事实上，TripData并没有映射到单个属性，但我想加入FTP\u ID

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问候。

我无法加入复合密钥的一部分。 为了解决这个问题，我修改了与实体ReportTripSingle关联的表，添加了ftpBatchId和ftpDay作为外键

如果有人感兴趣，以下是我的实现：

实体报告单

public class ReportTripSingle implements java.io.Serializable {

@Id
@Column(name = "TRE_ID", precision = 10, scale = 0)
private long id;

@Column(name = "TRE_FTP_ID", length = 15, nullable = false, precision = 10, scale = 0, insertable = false, updatable = false)
private long tripDataId;

@Column(name = "TRE_BATCH_ID", nullable = false, insertable = false, updatable = false)
private long tripBatchId;

@Column(name = "TRE_FTP_DEP_DAY", nullable = false,insertable = false, updatable = false)
private long tripDay;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumns({
        @JoinColumn(name = "TRE_FTP_ID", referencedColumnName = "FTP_ID"),
        @JoinColumn(name = "TRE_BATCH_ID", referencedColumnName = "FTP_BATCH_ID"),
        @JoinColumn(name = "TRE_FTP_DEP_DAY", referencedColumnName = "FTP_DAY")

})
private TripData tripData;
}

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更好的选择是在@Joincolumn中使用修饰符insertable=false和updateable=false，如中所述：

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“它不工作”是什么意思？你能提供一些错误日志、异常、不希望出现的行为吗？我已经复制了这个bug并添加了stacktrace

public class TripData implements java.io.Serializable {

    @EmbeddedId
    private TripDataPK tripDataPK;

    // some properties ...

}

public class ReportTripSingle implements java.io.Serializable {


    @Id
    @Column(name = "TRE_ID", precision = 10, scale = 0)
    private long id;

    @ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name = "TRE_FTP_ID", referencedColumnName = "FTP_ID")
    private TripData   tripData;


}

public class ReportTripSingle implements java.io.Serializable {

@Id
@Column(name = "TRE_ID", precision = 10, scale = 0)
private long id;

@Column(name = "TRE_FTP_ID", length = 15, nullable = false, precision = 10, scale = 0, insertable = false, updatable = false)
private long tripDataId;

@Column(name = "TRE_BATCH_ID", nullable = false, insertable = false, updatable = false)
private long tripBatchId;

@Column(name = "TRE_FTP_DEP_DAY", nullable = false,insertable = false, updatable = false)
private long tripDay;

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumns({
        @JoinColumn(name = "TRE_FTP_ID", referencedColumnName = "FTP_ID"),
        @JoinColumn(name = "TRE_BATCH_ID", referencedColumnName = "FTP_BATCH_ID"),
        @JoinColumn(name = "TRE_FTP_DEP_DAY", referencedColumnName = "FTP_DAY")

})
private TripData tripData;
}

public class ReportTripSingle implements java.io.Serializable {


    @Id
    @Column(name = "TRE_ID", precision = 10, scale = 0)
    private long id;

    @ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name = "TRE_FTP_ID", referencedColumnName = "FTP_ID", **insertable = false, updatable = false**)
    private TripData   tripData;

}