在数据库中添加第二个表

代替：

@Override    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {        Log.w(TAG, "Upgrading database from version " + oldVersion + " to "     + newVersion + ", which will destroy all old data");        db.execSQL("DROp TABLE IF EXISTS notes");        onCreate(db);    }

我不得不像下面这样修改方法：

@Override    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {        Log.w(TAG, "Upgrading database from version " + oldVersion + " to "     + newVersion + ", which will destroy all old data");        db.execSQL("DROP TABLE IF EXISTS notes");        db.execSQL("DROP TABLE IF EXISTS routes"); // line added        onCreate(db);    }

而我不是：

private static final int DATAbase_VERSION = 2;

我将其更改为：

private static final int DATAbase_VERSION = 3;

但是，我并不完全意识到REAL对更改数据库版本产生了影响。