Hibernate不會保存實體與多對一關係

這裏是我的表：Hibernate不會保存實體與多對一關係

CREATE TABLE `admin_log` (
    `LOG_ID` bigint(20) NOT NULL AUTO_INCREMENT, 
    `USER_ID` bigint(20) NOT NULL, 
    `CREATION_DATE` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00', 
    `ACTION` varchar(100) NOT NULL, 
    `DETAILS` varchar(100) DEFAULT NULL, 
    PRIMARY KEY (`LOG_ID`), 
    KEY `ADMIN_LOG_FK1` (`USER_ID`), 
    CONSTRAINT `ADMIN_LOG_FK1` FOREIGN KEY (`USER_ID`) REFERENCES `user_master` (`USER_ID`) 
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8

這裏是我的實體：

@Entity 
@Table (name = "admin_log") 
public class AdminLog { 

    private Long   logId; 
    private UserMaster  user; 
    ... 

    @Id 
    @GeneratedValue (strategy = IDENTITY) 
    @Column (name = "LOG_ID", unique = true, nullable = false, length = 20) 
    public Long getLogId() { 
     return logId; 
    } 

    public void setLogId (Long logId) { 
     this.logId = logId; 
    } 

    @ManyToOne 
    @JoinColumn (name = "USER_ID") 
    public UserMaster getUser() { 
     return user; 
    } 

    public void setUser (UserMaster user) { 
     this.user = user; 
    } 
    ... 
} 


@Entity 
@Table (name = "user_master") 
public class UserMaster { 

    private Long  userId; 
    ... 

    @Id 
    @GeneratedValue (strategy = IDENTITY) 
    @Column (name = "USER_ID", unique = true, nullable = false, length = 20) 
    public Long getUserId() { 
     return this.userId; 
    } 

    public void setUserId (Long userId) { 
     this.userId = userId; 
    } 
    ... 
}

當我嘗試使用save()方法保存AdminLog從HibernateTemplate我得到以下錯誤：

SEVERE: Column 'USER_ID' cannot be null 
org.springframework.dao.DataIntegrityViolationException: could not insert [...AdminLog]; 
SQL [insert into admin_log (ACTION, CREATION_DATE, DETAILS, USER_ID) values (?, ?, ?, ?)]; 
constraint [null] nested exception is org.hibernate.exception.ConstraintViolationException: could not insert: [...AdminLog]

問題是，userId絕對不是null！這就像Hibernate無法從user中檢索中的屬性。我究竟做錯了什麼？

來源

2013-02-07 stojke

在保存管理日誌之前您的用戶是否持續存在？ – Perception

使用@ManyToOne（.. cascade = {CascadeType.PERSIST，CascadeType.MERGE}）如果你想在一次調用中同時存在。 – twillouer

您可以在AdminLog中設置用戶屬性的位置顯示測試或示例代碼嗎？你說UserMaster有一個id，這是因爲你是否將UserMaster從休眠狀態中拉出來了？ –

之前，您試圖保存的UserMaster瞬態的實例。如果你有一個對象的id那麼你應該加載它的拳頭並保存之前設置爲AdminLog對象。

來源

2013-02-07 19:34:09

你必須堅持你UserMaster堅持AdminLog

來源

2013-02-07 18:25:08 Sudhakar

Hibernate不會保存實體與多對一關係

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