无法执行JDBC批量更新:线程"main"中的异常org.hibernate.exception.ConstraintViolationException:

Question

我是hibernate编程的新手请帮帮我,执行下面的文件时遇到问题.我正在使用MySQL数据库.我的错误是

SLF4J:无法加载类"org.slf4j.impl.StaticLoggerBinder".SLF4J:默认为无操作(NOP)记录器实现SLF4J:有关更多详细信息,请参阅http://www.slf4j.org/codes.html#StaticLoggerBinder.Hibernate:插入UserDetails(userName)值(？)Hibernate:插入UserDetails(userName)值(？)Hibernate:插入UserDetails(userName)值(？)Hibernate:插入车辆(vehiName)值(？)Hibernate:插入车辆(vehiName)值(？)Hibernate:插入UserDetails_vehicle(UserDetails_userID,vehi_vehiID)值(？,？)Hibernate:插入UserDetails_vehicle(UserDetails_userID,vehi_vehiID)值(？,？)Hibernate:插入UserDetails_vehicle(UserDetails_userID, vehi_vehiID)值(？,？)

异常在线程"主要" org.hibernate.exception.ConstraintViolationException:无法在org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:96)在org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper执行JDBC批处理更新.的java:66)在org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:275)在org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:268)在org.hibernate.engine.ActionQueue.executeActions(ActionQueue的.java:188)处org.hibernate.impl在org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51 org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)). SessionImpl.flush(SessionImpl.java:1216)在org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)在org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)在com.annt.java .UserTest.main(UserTest.java:34)引起:java.sql.BatchU pdateException:复制在org.hibernate作为条目 '1' 为键 'vehi_vehiID' 在com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1669)在com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1085) .jdbc.BatchingBatcher.doExecuteBatch(BatchingBatcher.java:70)在org.hibernate.jdbc.AbstractBatcher.executeBatch(AbstractBatcher.java:268)... 8个

UserDetails.java

@Entity
public class UserDetails {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int userID;
    @OneToMany
    private List<vehicle> vehi = new ArrayList<vehicle>();

    public List<vehicle> getVehi() {
        return vehi;
    }

    public void setVehi(List<vehicle> vehi) {
        this.vehi = vehi;
    }

    public int getUserID() {
        return userID;
    }

    public void setUserID(int userID) {
        this.userID = userID;
    }
    private String userName;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

}

vehicle.java

 @Entity
    public class vehicle {

        @Id
        @GeneratedValue
        private int vehiID;

        public int getVehiID() {
            return vehiID;
        }

        public void setVehiID(int vehiID) {
            this.vehiID = vehiID;
        }

        public String getVehiName() {
            return vehiName;
        }

        public void setVehiName(String vehiName) {
            this.vehiName = vehiName;
        }
        private String vehiName;

    }

usertest.java

public class UserTest {

    public static void main(String[] args) {
        vehicle veh1 = new vehicle();
        veh1.setVehiName("car");
        vehicle veh2 = new vehicle();
        veh2.setVehiName("bus");
        UserDetails user1 = new UserDetails();
        UserDetails user2 = new UserDetails();
        user1.setUserName("user2");
        user2.setUserName("user2");
        UserDetails user3 = new UserDetails();
        user3.setUserName("user3");
        user1.getVehi().add(veh1);
        user2.getVehi().add(veh2);
        user3.getVehi().add(veh1);
        SessionFactory sf = new Configuration().configure().buildSessionFactory();
        Session ss = sf.openSession();
        ss.beginTransaction();
        ss.save(user1);
        ss.save(user2);
        ss.save(user3);
        ss.save(veh1);
        ss.save(veh2);
        ss.getTransaction().commit();
        ss.close();
    }

}

Answer 1

错误消息非常明确:存在唯一的密钥违规约束:您为两个不同的用户插入相同的车辆:

user1.getVehi().add(veh1);
//...
user3.getVehi().add(veh1);

这是不正确的,因为User和Vehicle之间的关联是OneToMany关联.因此,给定车辆属于一个且仅一个用户.如果您想在用户之间共享车辆,那么您需要一个ManyToMany关联,并且您需要删除on UserDetails_vehicle.vehi_vehiIDon上的唯一约束(如果您使用它来生成架构,Hibernate将不会创建它)