用现有记录的外键创建休眠实体
我正在使用休眠4.3.8。在Java Spring Web应用程序和postgres数据库中。用现有记录的外键创建休眠实体
我有两个外键记录中的记录B和C.
记录B已经存在于系统中。 记录C是新的,当我保存记录A时将被添加。记录A布局就是这样。
A.primaryKey A.foreignKey to B.primaryKey (already exists in system)
A.foreignKey to C.primaryKey (new record)
A.feildX
如何保存记录A?
感谢您的帮助
这里是classes.I是新冬眠这也解释了错误的实体。
@Entity @Table(name="atable")
public class Aclass {
@Id
@Column(name="arec_id")
private String id;
//Do not create a reference to the bclass in this object. however do write the bclass object with a foreign key reference back to this aclass object
? @Transient
? @OneToOne(cascade=?)
? @JoinTable(name="btable",[email protected](name="brec_id"))
? private Bclass bclass;
//Create a reference to the cclass object in this record and write the cclass object as well
@OneToOne(cascade=CascadeType.ALL)
@JoinColumn(name="crec_foreign_key",referencedColumnName="crec_id")
private Cclass cclass;
@Column(name="description")
private String description;
private VoiceEngineModel voiceEngineModel;
}
@Entity
@Table(name="btable")
public class Bclass {
@Id
@Column(name="brec_id")
private String id;
@Column(name="aref")
private String aref;
@Column(name="description")
private String description;
}
@Entity
@Table(name="ctable")
public class Cclass {
@Id
@Column(name="crec_id")
private String id;
@Column(name="description")
private String description;
}
回答:
我想出了解决方案。好简单。 Bclass的原始代码是错误的。抱歉。
- 除去任何参考在ACLASS
到Bclass为Bclass修改列引用
@Entity @Table(名称= “BTABLE”) 公共类Bclass {
@Id @Column(name =“brec_id”) private String id;
@ManyToOne @JoinColumn(name =“aref”) private Aclass aref;
@Column(name =“description”) private String description;
}
以上是 用现有记录的外键创建休眠实体 的全部内容, 来源链接: utcz.com/qa/263841.html