Saving Contacts in database

I can't save contacts in my database. i have tried many things so be kind and help me guys.

         @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (android.os.Build.VERSION.SDK_INT >= 23) {
        requestPermissions(new String[]{Manifest.permission.READ_CONTACTS,},
               READ_CONTACTS_PERMISSIONS_REQUEST);
    }else{
        getcontacts();
    }

}


public void getcontacts(){
    phones = getActivity().getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);
    while (phones.moveToNext())
    {
        String name=phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME+" ASC"));
        String phoneNumber = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));

    }
    DataBaseOperations hell = new DataBaseOperations(getActivity());
    SQLiteDatabase db = hell.getWritableDatabase();
    hell.Contacts(phones, db);
    db.close();
    phones.close();

}



@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View lview = inflater.inflate(R.layout.fragment_contacts_list, container, false);


    return lview;
}

@Override
public void onRequestPermissionsResult(int requestCode,
                                       @NonNull String permissions[],
                                       @NonNull int[] grantResults){
    // Make sure it's our original READ_CONTACTS request
    if (requestCode == READ_CONTACTS_PERMISSIONS_REQUEST) {
        if (grantResults.length == 1&&
                grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    getcontacts();
        } else {
            Toast.makeText(getActivity(), "Read Contacts permission denied", Toast.LENGTH_SHORT).show();
        }
    } else {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

and here is my code of contacts where i save contacts in my database.

      public void Contacts(Cursor cursor,SQLiteDatabase db ){
      if (cursor.moveToFirst()){
        while(!cursor.isAfterLast()){
            String name = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
            String phone = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
            ContentValues sv = new ContentValues();
            sv.put(mDatabase.Tableinfo.Contacts_phone, phone);
            sv.put(mDatabase.Tableinfo.Contacts_name,   name);
            db.insert(mDatabase.Tableinfo.contacts, null, sv);
            cursor.moveToNext();
        }
    }
    cursor.close();

but there is nothing in my database. Can you guys please help me out. i already have added Read and Write Contacts permission in my menifest file.Please i got stuck here and its been three days.