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!