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

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);
		}
	}