android sqlite

        SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(MainActivity.this.getString(R.string.db_chat_history), null);
        db.execSQL("create table if not exists unreaded(FromWho text,Msg text)");
        Cursor cursor = db.rawQuery("select * from unreaded", null);
        if(cursor.moveToFirst() && cursor.getCount() >= 1) {
            do {
                sendMsg(cursor.getString(cursor.getColumnIndex("FromWho")),cursor.getString(cursor.getColumnIndex("Msg")));
            } while (cursor.moveToNext());
        }