hibernate联合主键注解方式

方法一：主键类用@Embeddable，pojo类仍然用@Entity但是引用主键类的对象用@Id 

主键pojo类： 

@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类： 

@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(*)         主键pojo类无需加@EmbeddedlD注解，只需在pojo类新属性“composeIdPK”的get方法前写@EmbeddedlD即可 

方法三：@Id  @IdClass(*)  主键pojo类无需加注解，原pojo类的id，name属性保留不变，也无需新增“ComposeIDPK”属性。 只在id，name的get方法前都加@Id，并在原pojo类前加 @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;

本文为转载, 源出处未找到..见谅!