Question

我必须映射设计糟糕的数据库。并且在班级＆＃34; cote＆＃34;有一个组成PK与FK字段。所以我做了一个可嵌入的，以避免使用带有IdClass的派生实体。所以我尝试了这个：

@Entity
@Table(name="EVA_COTE")
public class Cote implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = -3902534586060936635L;

@EmbeddedId
private CotePK cotePK;

@ManyToOne
@JoinColumn(name="Evaluation", referencedColumnName = "NUDOSS")
private Evaluation evaluation;

@ManyToOne
@JoinColumn(name="CRITERE", referencedColumnName = "CODE")
private Critere critere;

@ManyToOne
@JoinColumn(name="SEUIL", referencedColumnName = "CODE")
private Seuil seuil;

@Column(name="VALEUR", columnDefinition="Decimal(5,0)")
private Integer valeur;

@Column(name="OBSERVATIONS", length=500)
private String observations;

使用以下EmbeddedId：

@Embeddable
public class CotePK implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = 6835265195560184935L;
@Column(name="Evaluation", nullable=false)
private Integer evaluationId;

@Column(name="CRITERE", nullable =false)
private String critereId;

@Column(name="SEUIL", nullable=false)
private String seuilId;

正如您所看到的，我在embeddedId中使用了列评估critere和seuil，在Cote类中使用了一次。当然，它不起作用，我不知道该怎么做。有没有办法强制JPA链接这两个字段？

Answer 1

我的最终解决方案： @实体 @table（名称=＆＃34; EVA_COTE＆＃34）公共类Cote实现Serializable {

/**
 * 
 */
private static final long serialVersionUID = -3902534586060936635L;

@EmbeddedId
private CotePK cotePK;

@ManyToOne
@MapsId("evaluationId")
@JoinColumn(name="EVALUATION", referencedColumnName = "NUDOSS")
private Evaluation evaluation;

@ManyToOne
@MapsId("critereId")
@JoinColumn(name="CRITERE", referencedColumnName = "CODE")
private Critere critere;

@ManyToOne
@MapsId("seuilId")
@JoinColumn(name="SEUIL", referencedColumnName = "CODE")
private Seuil seuil;

Answer 2

将此注释添加到复合主键

       @EmbeddedId            
       @AttributeOverrides( {
                @AttributeOverride(name="column_varible_name_1", column=@Column(name="column_name_1", nullable=false, length=<x>) ), 
                @AttributeOverride(name="column_varible_name_2", column=@Column(name="column_name_2", nullable=false, length=<x>) ) } )

JPA HIBERNATE - 两次映射列（embeddedID和POJO）

2 个答案: