尝试使用hibernate将数据插入数据库时​​出错。错误是约束违规异常（使用Oracle DB）

Question

错误发生在session.save（customer）行.CUSTOMER和EventRequest是表名。 custno。是CUSTOMER表和EventRequest表中的主键。

客户和EventRequest文件中的映射是否存在任何问题。

custno。在CUSTOMER表中不应为null，但hibernate不插入custno。在CUSTOMER TABLE中。这就是hibernate的作用：它缺少custno。柱。

插入CUSTOMER（内部，地址，城市，联系人，custname，phone，state，zip）值（？，？，？，？，？，？，？，？）

错误跟踪：

log4j:WARN No appenders could be found for logger (org.jboss.logging).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

**Hibernate: insert into CUSTOMER (Internal, address, city, contact, custname, phone, state, zip) values (?, ?, ?, ?, ?, ?, ?, ?)**

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.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDelegate.java:61)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2975)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3487)
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:81)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:377)
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:214)
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:194)
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:178)
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:321)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:286)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:206)
    at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:191)
    at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
    at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:764)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:756)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:752)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:352)
    at com.sun.proxy.$Proxy12.save(Unknown Source)
    at com.icdab.www.icdab_first.App.persistAnnotatedLists(App.java:67)
    at com.icdab.www.icdab_first.App.main(App.java:89)
Caused by: java.sql.SQLIntegrityConstraintViolationException: ORA-01400: cannot insert NULL into ("SYSTEM"."CUSTOMER"."CUSTNO")

    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)

“错误说不能插入NULL（”SYSTEM“。”CUSTOMER“。”CUSTNO“）”。 App.Java：

package com.icdab.www.icdab_first;

import java.sql.Date;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Session; 
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration; 
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder; 
/**
 * Hello world!
 *
 */
public class App 
{
    private static SessionFactory factory;
    private static ServiceRegistry registry;
    // private void init(){
       // System.out.println("in init");
    static {
        Configuration config = new Configuration().configure("hibernate.cfg.xml");
                /*.addAnnotatedClass(CompundKey.class)
                .addAnnotatedClass(Customer.class)
                .addAnnotatedClass(Employee.class)
                .addAnnotatedClass(EventPlan.class)
                .addAnnotatedClass(EventPlanLine.class)
                .addAnnotatedClass(EventRequest.class)
                .addAnnotatedClass(Facility.class)
                .addAnnotatedClass(Location.class)
                .addAnnotatedClass(ResourceTbl.class) */

        // learn why did you use the annotatedclass and configuration.

          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_one = factory.getSessionFactory().openSession();
        Session session = factory.getCurrentSession(); 
        session.beginTransaction();
        Customer customer = new Customer(); 
        customer.setAddress("address123");
        customer.setCity("lansing");
        customer.setContact("1632 ne ave");
        customer.setCustname("john");
        customer.setCustno("1234");
        customer.setInternal("internal");
        customer.setPhone(122345679);
        customer.setState("OR");
        customer.setZip(97654);
        System.out.println("the setter methods completed");
        List<EventRequest> ers = new ArrayList<EventRequest>();

        ers.add(new EventRequest(123,new Date(92,5,1),new Date(91,5,1),new Date(93,5,1),"av",123,456,124));

        ers.add(new EventRequest(1234,new Date(92,5,2),new Date(91,5,2),new Date(93,5,2),"av",124,457,125));
        customer.setEventrequests(ers);

        //here is the error 
        session.save(customer); 


        System.out.println("befor commit");
        session.getTransaction().commit();
        System.out.println("after commit");
        System.out.println("done persist");
    }
    private void retrieveList(){
        Session session = factory.getCurrentSession();
        session.beginTransaction(); 

        List list = session.createQuery("from com.icdab.www.icdab_first.Customer").list();

        for (Object object : list) {
            System.out.println("** List items: "+object);
        }
        session.getTransaction().commit();
        System.out.println("Done retrieve");
    }

    public static void main (String[] args){
        App app = new App();
        //app.init();
        app.persistAnnotatedLists();
        app.retrieveList();
    }
}

Customer.java：

package com.icdab.www.icdab_first;
import javax.persistence.*;

import org.hibernate.annotations.Cascade;

import org.hibernate.annotations.CascadeType;

import java.util.List;
import com.icdab.www.icdab_first.EventRequest;

@Entity
@Table(name="CUSTOMER")
public class Customer {
@Id 
@Column(name="custno",nullable=false)
@GeneratedValue(strategy= GenerationType.IDENTITY)
private String custno;

private String custname; 
private String address;
private String Internal; 
private String contact; 
private int phone;
private String city; 
private String state; 
private int zip; 


//added block to define the onetomany relationship b.w tables.

@OneToMany
@JoinColumn(name="custno")
@Cascade(CascadeType.ALL)
private List<EventRequest> eventrequests;


public List<EventRequest> getEventrequests() {
    return eventrequests;
}
public void setEventrequests(List<EventRequest> eventrequests) {
    this.eventrequests = eventrequests;
}




public String getCustno() {
    return custno;
}
public void setCustno(String custno) {
    this.custno = custno;
}
public String getCustname() {
    return custname;
}
public void setCustname(String custname) {
    this.custname = custname;
}
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
public String getInternal() {
    return Internal;
}
public void setInternal(String internal) {
    Internal = internal;
}
public String getContact() {
    return contact;
}
public void setContact(String contact) {
    this.contact = contact;
}
public int getPhone() {
    return phone;
}
public void setPhone(int phone) {
    this.phone = phone;
}
public String getCity() {
    return city;
}
public void setCity(String city) {
    this.city = city;
}
public String getState() {
    return state;
}
public void setState(String state) {
    this.state = state;
}
public int getZip() {
    return zip;
}
public void setZip(int zip) {
    this.zip = zip;
}
}

EventRequest.java：

package com.icdab.www.icdab_first;
import java.sql.Date;
import java.sql.Time; 
import javax.persistence.*;
import java.util.List;
import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
import com.icdab.www.icdab_first.Customer;

@Entity
@Table(name="EVENTREQUEST")
public class EventRequest {
@Id 
@Column(name="EVENTNO",nullable=false)
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int eventno; 
private Date dateheld;
private Date datereq; 
//private int facno; 
private Date dateauth;
private String status; 
private int estcost;
private int estaudience;
private int budno;

public EventRequest(){
}

public EventRequest(int eventno, Date dateheld,
        Date datereq, Date dateauth,String status,
        int estcost, int estaudience,int budno)
{
    setEventno(eventno);
    setDateheld(dateheld);
    setDatereq(datereq);
    setDateauth(dateauth);
    setStatus(status);
    setEstcost(estcost);
    setEstaudience(estaudience);
    setBudno(budno);
}
// one to many mapping eventrequest and eventplan 
@OneToMany
@JoinColumn(name="eventno")
@Cascade(CascadeType.ALL)
private List<EventPlan> eventplans;
public List<EventPlan> getEventplans() {
    return eventplans;
}
public void setEventplans(List<EventPlan> eventplans) {
    this.eventplans = eventplans;
}


public int getEventno() {
    return eventno;
}
public void setEventno(int eventno) {
    this.eventno = eventno;
}
public Date getDateheld() {
    return dateheld;
}
public void setDateheld(Date dateheld) {
    this.dateheld = dateheld;
}
public Date getDatereq() {
    return datereq;
}
public void setDatereq(Date datereq) {
    this.datereq = datereq;
}

/*
public int getCustno() {
    return custno;
}
public void setCustno(int custno) {
    this.custno = custno;
}
*/

/*
public int getFacno() {
    return facno;
}
public void setFacno(int facno) {
    this.facno = facno;
}

*/
public Date getDateauth() {
    return dateauth;
}
public void setDateauth(Date dateauth) {
    this.dateauth = dateauth;
}
public String getStatus() {
    return status;
}
public void setStatus(String status) {
    this.status = status;
}
public int getEstcost() {
    return estcost;
}
public void setEstcost(int estcost) {
    this.estcost = estcost;
}
public int getEstaudience() {
    return estaudience;
}
public void setEstaudience(int estaudience) {
    this.estaudience = estaudience;
}
public int getBudno() {
    return budno;
}
public void setBudno(int budno) {
    this.budno = budno;
}

}

Answer 1

GenerationType.IDENTITY表示持久性提供程序必须使用数据库标识列为实体分配主键。没有这样的东西叫做＃34;身份＆＃34;从Oracle 11g开始的Oracle中的列（12c中可用）。因此，在您的情况下，您必须创建数据库序列，然后使用@GeneratedValue(strategy=GenerationType.AUTO)或@GeneratedValue(strategy=GenerationType.SEQUENCE, generator="seq")为主键字段生成值。