hibernate聯合主鍵注解方式

方法一：主鍵類用@Embeddable，pojo類仍然用@Entity但是引用主鍵類的對象用@Id 

主鍵pojo類： 

@Embeddable
public class composeIdPK implements Serializable {
 private String name;
 private int id;
  @Column(length=20,name="pkName")
 public String getName() {
  return name;
 }
    @Column(length=10,name="uuid")
 public int getId() {
  return id;
 }      

pojo類： 

@Entity
public class composeId {
 private composeIdPK pk;
 private int uid;
 private String title;
 private String address;
 
 @Id
 public composeIdPK getPk() {
  return pk;
 }      

方法二：@EmbeddedlD(*)         主鍵pojo類無需加@EmbeddedlD注解，隻需在pojo類新屬性“composeIdPK”的get方法前寫@EmbeddedlD即可 

方法三：@Id  @IdClass(*)  主鍵pojo類無需加注解，原pojo類的id，name屬性保留不變，也無需新增“ComposeIDPK”屬性。 隻在id，name的get方法前都加@Id，并在原pojo類前加 @IdClass(*)

如下： 

@Entity
@IdClass(com.study.model.composeID.composeIdPK.class)
public class composeId {
 //private composeIdPK pk;
    private int id;
    private String name;
    @Id
    @Column(length=10,name="uuid")
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 @Id
  @Column(length=20,name="pkName")
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 private String title;
 private String address;      

作者：習慣沉澱