Java Hibernate-復合主鍵問題

Question

我有以下兩個表

創建表event_type_master（Event_Type_Code varchar（128）NOT NULL，PRIMARY KEY（Event_Type_Code））

創建表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）參考Event_type_master（Event_Type_Code））

現在，我為上述關系創建了模型類，如下EventMaster類：-

@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;
}

}

復合主鍵設置的EventMasterId類：-

@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類別

@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;
}

}

設置全部之后，我使用Netbeans創建了一個HebernateUtil類以連接到HibernateSession Factory，並嘗試測試將記錄添加到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();
    }

但是我正在關注錯誤

休眠狀態：插入到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（？，？，？，？，？，？，？，？，？，？）的值1473 [main] WARN org .hibernate.util.JDBCExceptionReporter-SQL錯誤：1048，SQLState：23000 1473 [main]錯誤org.hibernate.util.JDBCExceptionReporter-列“ Event_Type_Code”不能為空1474 [main]錯誤org.hibernate.event.def.AbstractFlushingEventListener-無法與會話org.hibernate.exception.ConstraintViolationException同步數據庫狀態：無法執行JDBC批更新org.hibernate.exception.ConstraintViolationException：無法在org.hibernate.exception.SQLStateConverter.convert（SQLStateConverter.java： 94）位於org.hibernate.exception.JDBCExceptionHelper.convert（JDBCExceptionHelper.java:66）位於org.hibernate.jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java:275）位於org.hibernate.engine.ActionQueue.executeActions（ActionQueue.ja va：266）在org.hibernate.event.def.DefaultFlushEventListener上的org.hibernate.event.def.AbstractFlushingEventListener.performExecutions（AbstractFlushingEventListener.java:321）上的org.hibernate.engine.ActionQueue.executeActions（ActionQueue.java:167） org.hibernate.impl.SessionImpl.flush（SessionImpl.java:1028）的.onFlush（DefaultFlushEventListener.java:50）org.hibernate.transaction的org.hibernate.impl.SessionImpl.managedFlush（SessionImpl.java:366）的.onFlush（DefaultFlushEventListener.java:50） JDBCTransaction.commit（JDBCTransaction.java:137）在測試中.NewMain.main（NewMain.java:46）由以下原因引起：java.sql.BatchUpdateException：com.mysql.jdbc.PreparedStatement.executeBatchSerially（）上的列“ Event_Type_Code”不能為null在com.mysql.jdbc.PreparedStatement.executeBatch（PreparedStatement.java:1082）在org.hibernate.jdbc.BatchingBatcher.doExecuteBatch（BatchingBatcher.java:70）在org.hibernate.jdbc.AbstractBatcher.execute處的PreparedStatement.java:1666） （AbstractBatcher.java:268）

請幫我解決這個問題。

Answer 1

我想你有錯字。

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

第一行應該是key1.setEventTypeCode。