主表的主键是从表的一个复合主键
主表
@Entity
@Table(name =
"user")
public class User {
@Id
@Column(name =
"ID", unique =
true, nullable =
false, precision =
22, scale =
0)
private Long id;
@Column(name =
"USER_NAME", length =
100)
private String userName;
@Column(name =
"USER_PWD", length =
100)
private String userPwd;
@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy =
"userParamKey.user")
private List<UserParam> userParams =
new ArrayList<UserParam>();
｝
从表
@Entity
@Table(name =
"user_param")
public class UserParam implements Serializable {
@EmbeddedId
@AttributeOverrides({
@AttributeOverride(name =
"userId", column =
@Column(name =
"USER_ID", nullable =
false)),
@AttributeOverride(name =
"openId", column =
@Column(name =
"OPEN_ID", nullable =
false))
})
private UserParamKey userParamKey;
@Column(name =
"VALUE")
private String value;
｝
从表复合主键
@Embeddable
public class UserParamKey implements Serializable {
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name =
"USER_ID", nullable =
false)
private User user;
@Column(name =
"NAME", nullable =
false)
private String name;
｝
以上
