Question

我有两个带有hibernate的映射类：

SETTLEMENT_MODEL_GROUP （父母）：

@Entity
@Table(name = "MODEL_GROUP")
public class SettlementModelGroup
{

//omitted some not fields

@OneToMany( fetch = FetchType.LAZY, mappedBy = "modelGroup" )
private List<SettlementModel> settlementModels;

}

SETTLEMENT_MODEL 孩子：

@Entity
@Table(name = "MODEL")
public class SettlementModel
{

//omitted some not fields

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "MODEL_GROUP_ID", insertable = false, updatable = false, nullable = false)
private SettlementModelGroup modelGroup;

}

现在我正在简单地插入数据库：

  SettlementModel model = new SettlementModel();
  SettlementModelGroup settlementModelGroup = modelManager.getModelGroup( modelGroupId );

  //setting other fields for model
  model.setModelGroup( settlementModelGroup );

  sessionFactory.getCurrentSession().save( model );

给我：

SQL Error: 1400, SQLState: 23000
ORA-01400: cannot insetr NULL into ("MYSCHEMA"."MODEL"."MODEL_GROUP_ID")

为什么hibernate不插入父ID，虽然它存在并被创建？即使在标准输出上给它也会返回正确的ID ......

此外，我无法从 SettlementModel 中删除insertable = false, updatable = false，因为它在部署期间给出了Hibernate错误

Answer 1

添加到@OneToMany cascade = CascadeType.ALL
从父

中删除nullable = false

Answer 2

尝试将cascade = CascadeType.ALL用于hbm文件，您在其中定义了oneToMany关系

休眠不插入父

2 个答案: