Question

我有以下两个表

CREATE TABLE event_type_master（ Event_Type_Code varchar（128）NOT NULL， PRIMARY KEY（Event_Type_Code））

CREATE TABLE event_master（ Event_Code varchar（128）NOT NULL， Event_Type_Code varchar（128）NOT NULL， PRIMARY KEY（Event_Code，Event_Type_Code）， CONSTRAINT FK1 FOREIGN KEY（Event_Type_Code）REFERENCES event_type_master（Event_Type_Code））

现在我已经为上述关系创建了模型类，如下所示 EventMaster类： -

@Entity
@Table(name="event_master")
public class EventMaster  implements java.io.Serializable {

 private EventMasterId id;
 private EventTypeMaster eventTypeMaster;
 private String eventName;

public EventMaster() {
}

public EventMaster(EventMasterId id, EventTypeMaster eventTypeMaster) {
    this.id = id;
    this.eventTypeMaster = eventTypeMaster;
}
public EventMaster(EventMasterId id, EventTypeMaster eventTypeMaster) {
   this.id = id;
   this.eventTypeMaster = eventTypeMaster;
   this.eventName = eventName;
}

@EmbeddedId    
@AttributeOverrides( {
@AttributeOverride(name="eventCode", column=@Column(name="Event_Code", nullable=false, length=128) ), 
@AttributeOverride(name="eventTypeCode", column=@Column(name="Event_Type_Code", nullable=false, length=128) ) } )
public EventMasterId getId() {
    return this.id;
}

public void setId(EventMasterId id) {
    this.id = id;
}

@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name="Event_Type_Code",referencedColumnName = "Event_Type_Code",  nullable=false, insertable=false, updatable=false)
public EventTypeMaster getEventTypeMaster()
{
    return this.eventTypeMaster;
}

public void setEventTypeMaster(EventTypeMaster eventTypeMaster) {
    this.eventTypeMaster = eventTypeMaster;
}

}

复合主键设置的EventMasterId类： -

@Embeddable
public class EventMasterId  implements java.io.Serializable {
private String eventCode;
private String eventTypeCode;

public EventMasterId() {
}

public EventMasterId(String eventCode, String eventTypeCode) 
{
   this.eventCode = eventCode;
   this.eventTypeCode = eventTypeCode;
}

@Column(name="Event_Code", nullable=false, length=128)
public String getEventCode() {
    return this.eventCode;
}

public void setEventCode(String eventCode) {
    this.eventCode = eventCode;
}

@Column(name="Event_Type_Code", nullable=false, length=128)
public String getEventTypeCode() {
    return this.eventTypeCode;
}

public void setEventTypeCode(String eventTypeCode) {
    this.eventTypeCode = eventTypeCode;
}

public boolean equals（Object other）{ ........ }

public int hashCode（）{ .......... }
}

EventTypeMaster类

@Entity
@Table(name="event_type_master")
public class EventTypeMaster  implements java.io.Serializable {
 private String eventTypeCode;
 private String eventTypeName;
 private Set<EventMaster> eventMasters = new HashSet<EventMaster>(0);

public EventTypeMaster() {
}


public EventTypeMaster(String eventTypeCode) {
    this.eventTypeCode = eventTypeCode;
}
public EventTypeMaster(String eventTypeCode, String eventTypeName, Set eventMasters) {
   this.eventTypeCode = eventTypeCode;
   this.eventTypeName = eventTypeName;
   this.eventMasters = eventMasters;
}

@Id    
@Column(name="Event_Type_Code", unique=true, nullable=false, length=128)
public String getEventTypeCode() {
    return this.eventTypeCode;
}

public void setEventTypeCode(String eventTypeCode) {
    this.eventTypeCode = eventTypeCode;
}

@OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, mappedBy="eventTypeMaster")
@JoinColumn(name="Event_Type_Code", referencedColumnName = "Event_Type_Code")
public Set<EventMaster> getEventMasters() {
    return this.eventMasters;
}

public void setEventMasters(Set<EventMaster> eventMasters) {
    this.eventMasters = eventMasters;
}

}

设置All之后我使用Netbeans创建了一个HebernateUtil类连接到HibernateSession Factory并尝试测试将记录添加到event_master表中，如下所示

    Session session = null;
    session = NewHibernateUtil.getSessionFactory().getCurrentSession();

    try {
        org.hibernate.Transaction tx = session.beginTransaction(); 
        EventMasterId key1=new EventMasterId();
        EventTypeMaster eTypeMaster1=new EventTypeMaster();

        eTypeMaster1=(EventTypeMaster)session.load(EventTypeMaster.class, "e1");

        key1.setEventCode(eTypeMaster1.getEventTypeCode());
        key1.setEventCode("Test_Event_Code");

        EventMaster em=new EventMaster();
        em.setId(key1);
        em.setEventTypeMaster(eTypeMaster1);
        em.setEventDesc("Event Description");


        session.save(em);

        session.getTransaction().commit();

    } catch (Exception e) {
        e.printStackTrace();
    }

但我收到了错误

Hibernate：插入event_master（Create_DTTM，Created_By，Event_Desc，Event_Name，Event_Short_Name，Last_Mod_By，Last_Mod_DTTM，Event_Code，Event_Type_Code）值（？，？，？，？，？，？，？，？，？） 1473 [main] WARN org.hibernate.util.JDBCExceptionReporter - SQL错误：1048，SQLState：23000 1473 [main] ERROR org.hibernate.util.JDBCExceptionReporter - 列'Event_Type_Code'不能为null 1474 [main] ERROR org.hibernate.event.def.AbstractFlushingEventListener - 无法将数据库状态与会话同步 org.hibernate.exception.ConstraintViolationException：无法执行JDBC批量更新 org.hibernate.exception.ConstraintViolationException：无法执行JDBC批量更新在org.hibernate.exception.SQLStateConverter.convert（SQLStateConverter.java:94）在org.hibernate.exception.JDBCExceptionHelper.convert（JDBCExceptionHelper.java:66）在org.hibernate.jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java:275）在org.hibernate.engine.ActionQueue.executeActions（ActionQueue.java:266）在org.hibernate.engine.ActionQueue.executeActions（ActionQueue.java:167）在org.hibernate.event.def.AbstractFlushingEventListener.performExecutions（AbstractFlushingEventListener.java:321）在org.hibernate.event.def.DefaultFlushEventListener.onFlush（DefaultFlushEventListener.java:50）在org.hibernate.impl.SessionImpl.flush（SessionImpl.java:1028）在org.hibernate.impl.SessionImpl.managedFlush（SessionImpl.java:366）在org.hibernate.transaction.JDBCTransaction.commit（JDBCTransaction.java:137）在test.NewMain.main（NewMain.java:46）引起：java.sql.BatchUpdateException：列'Event_Type_Code'不能为null 在com.mysql.jdbc.PreparedStatement.executeBatchSerially（PreparedStatement.java:1666）在com.mysql.jdbc.PreparedStatement.executeBatch（PreparedStatement.java:1082）在org.hibernate.jdbc.BatchingBatcher.doExecuteBatch（BatchingBatcher.java:70）在org.hibernate.jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java:268）

请帮我解决这个问题。

Answer 1

我认为你有一个错字。

key1.setEventCode(eTypeMaster1.getEventTypeCode());
key1.setEventCode("Test_Event_Code");

第一行应该是key1.setEventTypeCode。

Java Hibernate - 复合主键问题

1 个答案: