Java 尝试使用hibernate将数据插入子表时出错。完整性约束冲突

父表：（Customer_one）使用hibernate级联和级联类型。尝试在app.persistAnnoatedLists（）方法中提交事务时发生约束冲突错误。（我能够将数据插入父表，但无法将数据插入子表），错误消息是（子表中的外键似乎没有映射到父键，使用的是Oracle DB，使用的主键生成类型是sequence）：

表： 顾客第一： PK--->custnone。 事件请求(1): PK-->eventnoone。 FK-->custnoone

Exception in thread "main" org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:74)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:136)
    at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:58)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3067)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3509)
    at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:88)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:377)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:369)
    at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:286)
    at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:339)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1234)
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:404)
    at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
    at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
    at icdabs.econd.icdab.App.persistAnnotatedLists(App.java:75)
    at icdabs.econd.icdab.App.main(App.java:96)
Caused by: java.sql.SQLIntegrityConstraintViolationException: ORA-02291: integrity constraint (SYSTEM.EVENTREQUEST_FK_ONE) violated - parent key not found

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:450)
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:399)
    at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:1017)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:655)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:566)
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:215)
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:58)
    at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:943)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1075)
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3820)
    at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3897)
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1361)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:133)

顾客第一：

@Entity
@Table(name = "CUSTOMER_ONE")
public class Customer_one {
    @Id
    @Column(name = "custnoone", nullable = false)
    @SequenceGenerator(name="mysequence", sequenceName="my_seq",allocationSize=1)
    @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="mysequence")
    private int custnoone;

private String custnameone;
private String addressone;
private String Internalone;
private String contactone;
private int phoneone;
private String cityone;
private String stateone;
private int zipone;

    @OneToMany
    @JoinColumn(name="custnoone")
    @Cascade(CascadeType.SAVE_UPDATE)
    private List<EventRequest_one> EventRequest_ones = new ArrayList<EventRequest_one>(); 



    public List<EventRequest_one> getEventRequest_ones() {
        return EventRequest_ones;
    }
    public void setEventRequest_ones(List<EventRequest_one> eventRequest_ones) {
        EventRequest_ones = eventRequest_ones;
    }

Main（App.java）：

公共类应用程序
{
私营静电厂；
私有静态服务注册表；
静止的{
Configuration config=new Configuration（）.configure（“hibernate.cfg.xml”）；
registry=new ServiceRegistryBuilder（）.applySettings（config.getProperties（））.buildServiceRegistry（）；
factory=config.buildSessionFactory（注册表）；
}
@抑制警告（“弃用”）
私有void persistedList（）{
Configuration config=new Configuration（）.configure（“hibernate.cfg.xml”）；
registry=new ServiceRegistryBuilder（）.applySettings（config.getProperties（））.buildServiceRegistry（）；
factory=config.buildSessionFactory（注册表）；
Session Session=factory.getCurrentSession（）；
session.beginTransaction（）；
客户_-one客户=新客户_-one（）；
客户。setAddressone（“地址123”）；
customer.setCityone（“兰辛”）；
客户：setContactone（“东北大街1632号”）；
客户。setCustnameone（“约翰”）；
//客户：Setcustnone（12）；
客户。setInternalone（“我”）；
客户：setPhoneone（122345679）；
客户。一方（“或”）；
客户：setZipone（97654）；
List er=new ArrayList（）；
添加（新事件请求单（新日期（92,5,1）、新日期（91,5,1）、新日期（93,5,1），“av”，123456124,12））；
session.save（客户）；
customer.setEventRequest_one（er）；
对于（EventRequest\u一个EventRequest\u一个：er）{
System.out.println（“内部为循环”）；
session.save（EventRequest\u个）；
}
session.getTransaction（）.commit（）；
session.close（）；
}
公共静态void main（字符串[]args）{
App App=新App（）；
app.persistAnnotatedList（）；
//app.retrieveList（）；
}
}

我想你自己也提到了答案：我不知道错误在哪里。我检查了Oracle数据库以及主键和外键是否相互匹配并正确引用。因此，问题可能在于hibernate映射。你能告诉我我在地图上做错了什么吗@Rahulraja删除了EventRequest_one类和getter和setter中的custnoone字段。并将数据库FK字段约束NOT NULL更改为NULL。然后它工作了。为什么非空约束必须在数据库中的一个表中删除EventRequest中的外键。否则我会得到错误，因为foriegnkey不能为null。在Customer\u one实体中，映射应该是

@OneToMany（cascade=ALL，mappedBy=“Customer\u one”）私有列表EventRequest\u one

，在EventRequest\u一侧，映射应该如下所示：

@manytone@JoinColumn（name=“custnoone”）public Customer\u one客户\u one您可以在此处找到帮助：
@Entity
@Table(name = "EVENTREQUEST_ONE")
public class EventRequest_one {
    @Id
    @Column(name = "eventnoone", nullable = false)
    @SequenceGenerator(name="mysequence", sequenceName="my_seq",allocationSize=1)
    @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="mysequence")
    private int eventnoone;
        private Date dateheldone;
    private Date datereqone;
    private int facnoone;
    private Date dateauthone;
    private String statusone;
    private int estcostone;
    private int estaudienceone;
    private int budnoone;
//  @Transient
    @Column(name="CUSTNOONE")
    private int custnoone;


    public EventRequest_one() {
    }

    public EventRequest_one( Date dateheld, Date datereq, Date dateauth, String status, int estcost,
            int estaudience, int budno, int facno) {
    //  setCustnoone(custno);
    //  setEventnoone(eventno);
        setDateheldone(dateheld);
        setDatereqone(datereq);
        setDateauthone(dateauth);
        setStatusone(status);
        setEstcostone(estcost);
        setEstaudienceone(estaudience);
        setBudnoone(budno);
        setFacnoone(facno);
    }


public int hashCode() {
        return 31;
    }
}

public class App 
{
    private static SessionFactory factory;
    private static ServiceRegistry registry;

    static {
        Configuration config = new Configuration().configure("hibernate.cfg.xml"); 
          registry = new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();
          factory=config.buildSessionFactory(registry);
    }

    @SuppressWarnings("deprecation")
    private void persistAnnotatedLists(){
        Configuration config = new Configuration().configure("hibernate.cfg.xml");

          registry = new ServiceRegistryBuilder().applySettings(config.getProperties()).buildServiceRegistry();
          factory=config.buildSessionFactory(registry);

        Session session = factory.getCurrentSession(); 
        session.beginTransaction();
        Customer_one customer = new Customer_one(); 
        customer.setAddressone("address123");
        customer.setCityone("lansing");
        customer.setContactone("1632 ne ave");
        customer.setCustnameone("john");
    //    customer.setCustnoone(12);
        customer.setInternalone("I");
        customer.setPhoneone(122345679);
        customer.setStateone("OR");
        customer.setZipone(97654);

        List<EventRequest_one> er = new ArrayList<EventRequest_one>();
         er.add(new EventRequest_one(new Date(92,5,1),new Date(91,5,1),new Date(93,5,1),"av",123,456,124,12));

    session.save(customer);
         customer.setEventRequest_ones(er);

    for(EventRequest_one EventRequest_Ones : er){
            System.out.println("inside for loop");
        session.save(EventRequest_Ones);

        }


        session.getTransaction().commit();
        session.close();
    }
public static void main (String[] args){
        App app = new App();

        app.persistAnnotatedLists();
    //  app.retrieveList();
    }
}