我有一个包含两列的组合主键的表,并且该表也具有唯一键。另一个表中的唯一键映射为外键。如何用Hibernate实现这个映射?我为复合主键创建了一个@Embedable类,并且在实体中使用了@EmbeddedId注解。在第二个表,我宣布一个字段:休眠:映射指向唯一键的外键
@ManyToOne
@JoinColumn(name = "user_code", nullable = false)
public User userCode;
这是从第一个表中的唯一关键,但我发现了异常:从com.users外键闯民宅com.users.maintenance.User .maintenance.Code列数错误。应该是2。
编辑 这是我的用户等级:
@Entity
@Table(name = "Users")
public class User {
@EmbeddedId
public UserPk userId;
@column(name = "code")
public int code;
public UserPk getUserId() {
return this.userId;
}
public void setUserId(UserPk userId) {
this.userId = userId;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
@Embeddable
private class UserPk implements Seriazible {
@Column(name = "user_name")
public String userName;
@Column(name = "email")
public String email;
public String getUserName() {
return this.userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getEmail() {
return this.email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public int hashCode() {
return this.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof UserPk)) {
return false;
}
UserPk pk = (UserPk)obj;
return pk.userName == userName && pk.email == email;
}
}
}
请显示用户级别 –