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

红太狼 2022-07-12 09:51 110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);
    		}
    	}