identifier of an instance of com.you.hibernate.model.TStudentInfo was altered from 6 to 7-蒲公英云

identifier of an instance of com.you.hibernate.model.TStudentInfo was altered from 6 to 7

红太狼 2022-07-12 09:51 161阅读 0赞

1、错误描述

Exception in thread "main" org.hibernate.HibernateException: identifier of an instance of com.you.hibernate.model.TStudentInfo was altered from 6 to 7
    at org.hibernate.event.internal.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:82)
    at org.hibernate.event.internal.DefaultFlushEntityEventListener.getValues(DefaultFlushEntityEventListener.java:194)
    at org.hibernate.event.internal.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:156)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:225)
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:51)
    at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1214)
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:403)
    at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)
    at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:175)
    at com.you.hibernate.dao.StudentDao.saveStuInfo(StudentDao.java:73)
    at com.you.hibernate.dao.StudentDao.main(StudentDao.java:107)

2、错误原因

 利用Hibernate批量添加，传入实体类参数，这里是用for循环进行批量添加；每循环一次，需要重新实例化实体类，但是却将实体类实例化放在循环外面
public static void main(String[] args) 
    {
               TStudentInfo student = new TStudentInfo();
        for(int i=10001;i<=100000;i++)
        {
            student.setId(i);
            student.setStuNo(i);
            student.setStuName("胡思思"+i);
            student.setStuAge(20);
            if(i%2==1)
            {
                student.setStuSex("女");
            }
            else
            {
                student.setStuSex("男");
            }
            student.setStuQq(""+i+"45744");
            student.setStuAddr("湖南省长沙市");
            saveStuInfo(student);
        }
    }

3、解决办法

public static void main(String[] args) 
    {
        for(int i=10001;i<=100000;i++)
        {
            TStudentInfo student = new TStudentInfo();
            student.setId(i);
            student.setStuNo(i);
            student.setStuName("胡思思"+i);
            student.setStuAge(20);
            if(i%2==1)
            {
                student.setStuSex("女");
            }
            else
            {
                student.setStuSex("男");
            }
            student.setStuQq(""+i+"45744");
            student.setStuAddr("湖南省长沙市");
            saveStuInfo(student);
        }
    }