Android SQLite 事物操作

public void payment(){
		SQLiteDatabase db = dbOpenHelper.getWritableDatabase();
		db.beginTransaction();//开启事务
		try{
			db.execSQL("update person set amount=amount-10 where personid=?", new Object[]{1});
			db.execSQL("update person set amount=amount+10 where personid=?", new Object[]{2});
			db.setTransactionSuccessful();//设置事务标志为成功，当结束事务时就会提交事务
		}finally{
			db.endTransaction();
		}
	}