hibernate子表继承父表，实体之间如何关联

hibernate子表继承父表，实体之间如何关联

附件表cgform_uploadfiles（数据库中的字段有id，name两个字段）对应hibernate实体类CgUploadEntity

附件父表（和其他附件表公共字段而抽出来的字段）t_s_attachment（数据库中的字段有id，userId两个字段）对应hibernate实体类TSAttachment

例子：让cgform_uploadfiles表继承t_s_attachment表，意思是说在保存cgform_uploadfiles子表的数据时，同时在t_s_attachment父表中也插入一条记录，两表之间通过id关联（两表的id相同）。

1.TSAttachment实体

@Entity

@Table(name = "t_s_attachment")

@Inheritance(strategy = InheritanceType.JOINED)

public  class TSAttachment  implements java.io.Serializable {

private String id;

private Integer userId;

@Id

@GeneratedValue(generator = "paymentableGenerator")

@GenericGenerator(name = "paymentableGenerator", strategy = "uuid")

@Column(name ="ID",nullable=false,length=32)

public String getId() {

return id;

}

public void setId(String id) {

this.id = id;

}

@Column(name ="ID")

public Integer getUserId() {

return userId;

}

public void setUserId(Integer userId) {

this.userId = userId;

}

}

2.cgform_uploadfiles实体

@Entity

@Table(name = "cgform_uploadfiles", schema = "")

@PrimaryKeyJoinColumn(name = "id")

@SuppressWarnings("serial")

public class CgUploadEntity extends TSAttachment implementsjava.io.Serializable{

private String name;

@Column(name ="name")

public String getName() {

return name;

}

public void setCgformId(String name) {

this.name = name;

}

}

总结：在保存TSAttachment实体对象的时候，上面两个实体的id值一样，都是都uuid自动生成。这很像一对一关联，但不同的是在CgUploadEntity实体对象中可以直接对TSAttachment实体对象的属性进行赋值和获取，很方便！