Sqlite rawQuery 返回空游标android：请求索引0，大小为0

Question

我正在尝试将字典链接到我的应用程序。 由于某种原因，我没有得到查询结果，因为游标是空的。 这是我的字典助手类：

  public dbHandler(Context context) {
    super(context, DB_NAME, null, DB_VERSION);
    if (android.os.Build.VERSION.SDK_INT >= 17)
        DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
    else
        DB_PATH = "/data/data/" + context.getPackageName() + "/databases/";
    this.mContext = context;
    copyDataBase();
    this.getReadableDatabase();
}

 public List<DictionaryModel> search(String keyword,SQLiteDatabase myDatabase) {
    List<DictionaryModel> contacts = null;
    openDataBase();
    //myDatabase = SQLiteDatabase.openOrCreateDatabase(dbPath+dbName+".db",null,null);
    Cursor cursor = null;
    try {
        //SQLiteDatabase sqLiteDatabase = getReadableDatabase();
        //Log.d("DICTIONARY_CHECK",dbPath+dbName+".db");
        String query = "select * from entries where word like ?";
        cursor = mDataBase.rawQuery(query,new String[] { "%" + keyword + "%" });
        cursor.moveToFirst();
        contacts = new ArrayList<>();
        if(cursor.getCount()>0)
        while (cursor.isAfterLast()){
            DictionaryModel contact = new DictionaryModel();
            contact.setWord(cursor.getString(0));
            contact.setWordType(cursor.getString(1));
            contact.setDefinition(cursor.getString(3));
            contacts.add(contact);
            cursor.moveToNext();
        }
    } catch (Exception e) {
        Log.d("DICTIONARY_CHECK_GET",e.getLocalizedMessage()+"  ");
    } finally {
        closeDatabase(myDatabase);
        if (cursor != null && !cursor.isClosed()) {
            cursor.close();
        }
    }
    return contacts;
}

这是我在主类中实现它的方式：

        mDBHelper = new dbHandler(this);
        try {
            mDBHelper.updateDataBase();
        } catch (IOException mIOException) {
            throw new Error("UnableToUpdateDatabase");
        }
        try {
            mDb = mDBHelper.getWritableDatabase();
        } catch (SQLException mSQLException) {
            throw mSQLException;
        }
        List<DictionaryModel> list = mDBHelper.search("absent",mDb);
                for(DictionaryModel model : list){
                    if(model!=null){
                        Log.d("DICTIONARY_CHECK", model.getWord()+"  "+model.getDefinition());
                    }
                }

游标获得的错误：请求索引 0，大小为 0