Java的休眠 - 複合主鍵問題

Question

我有以下兩個表

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

CREATE TABLE event_master（ EVENT_CODE PREVARY KEY（Event_Code，Event_Type_Code）， CONSTRAINT FK1 FOREIGN KEY（Event_Type_Code）REFERENCES event_type_master（Event_Type_Code）varchar（128）NOT NULL， Event_Type_Code varchar（128）NOT NULL， 0）

現在我對上述關係如下 EventMaster類創建模型類： -

@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; 
} 

}

EventMasterId類的複合主鍵設置： -

@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（Obje克拉其他）{ ........ }

公衆詮釋的hashCode（）{ .......... }
}

EventTypeMaster類

@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; 
} 

}

所有設置後，我創建了一個HebernateUtil柯樂s，使用NetBeans中連接到HibernateSession廠，並試圖測試記錄添加到event_master表如下

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(); 
    } 

但我得到以下錯誤

休眠：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 Error ：1048，SQLState：23000 1473 [main] ERROR org.hibernate.util.JDBCExceptionReporter - Column' Event_Type_Code」不能爲空 1474 [主]錯誤org.hibernate.event.def.AbstractFlushingEventListener - 無法同步與會話 org.hibernate.exception.ConstraintViolationException數據庫狀態：無法執行JDBC批處理更新 org.hibernate.exception。 ConstraintViolationException：無法在org.hibernate.exception.SQLStateConverter.convert（SQLStateConverter.java:94） 處執行JDBC批處理更新 at org.hibernate.exception.JDBCExceptionHelper.convert（JDBCExceptionHelper.java:66） at org.hibernate。 jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java:275） at org.hibernate.engine.ActionQueue.executeActions（ActionQueue.java:266） at org.hibernate.engine.ActionQueue.executeActions（ActionQueue。的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作爲。 impl.SessionImpl.flush（SessionImpl.java:1028） at org.hibernate.impl.SessionImpl.managedFlush（SessionImpl.java:366） at org.hibernate.transaction.JDBCTransaction.commit（JDBCTransaction.java:137） at test.NewMain.main（NewMain.java:46） 引起：java.sql.BatchUpdateException：列'Event_Type_Code'不能爲空 at com.mysql.jdbc.PreparedStatement.executeBatchSerially（PreparedStatement.java:1666） at com .mysql.jdbc.PreparedStatement.executeBatch（PreparedSt atement.java:1082） 在org.hibernate.jdbc.BatchingBatcher.doExecuteBatch（BatchingBatcher.java:70） 在org.hibernate.jdbc.AbstractBatcher.executeBatch（AbstractBatcher.java:268）

請幫我解決此問題。

Answer 1

我認爲你有一個錯字。

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

第一行應該是key1.setEventTypeCode。