java:jpa:composite_primary_key

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--- java:jpa:composite_primary_key [2014/07/21 15:47]
kwon37xi 만듦
+++ java:jpa:composite_primary_key [2019/04/24 12:17] (현재)
kwon37xi
@@ 줄 9: / 줄 9: @@
 ===== @AttributeOverrides =====
+===== 다른 엔티티들을 복합키로 가지기 =====
+  * [[http://www.java2s.com/Code/Java/JPA/SetIdClassforCompoundKey.htm|Set IdClass for Compound Key : Primary Key]]
+<code java>
+@Entity
+@Table(name = "EMP_PROJECT")
+@IdClass(ProjectAssignmentId.class)
+public class ProjectAssignment {
+  @Id
+  @Column(name = "EMP_ID", insertable = false, updatable = false)
+  private int empId;
+  @Id
+  @Column(name = "PROJECT_ID", insertable = false, updatable = false)
+  private int projectId;
+  @ManyToOne
+  @JoinColumn(name = "EMP_ID")
+  Professor employee;
+  @ManyToOne
+  @JoinColumn(name = "PROJECT_ID")
+  Project project;
+  ..
+}
+public class ProjectAssignmentId implements Serializable {
+  private int empId;
+  private int projectId;
+  ...
+}
+</code>
+===== 참조 =====
+  * [[https://www.javacodegeeks.com/2019/04/identifiers-hibernate.html|Identifiers In Hibernate | Java Code Geeks - 2019]]

java/jpa/composite_primary_key.1405925246.txt.gz · 마지막으로 수정됨: 2014/07/21 15:47 저자 kwon37xi