如何按任何字段搜索 Firebase 数据库？

Question

Is there any way I could search by any Reatime Firebase Database field? Right now I know how to search by FP_CarNumber, but I would like to search by others as well like SP_CarNumber or SP_CarNumber and FP_CarNumber at the same time.

    private void txtSearch(String str){
        FirebaseRecyclerOptions<MainModel> options =
                new FirebaseRecyclerOptions.Builder<MainModel>()
                        .setQuery(FirebaseDatabase.getInstance().getReference().child("Declaration_Data").child(currentuser).child("Declarations").orderByChild("FP_CarNumber").startAt(str).endAt(str + "\uf8ff"), MainModel.class)
                        .build();

        mainAdapter = new MainAdapter(options);
        mainAdapter.startListening();
        recyclerView.setAdapter(mainAdapter);

    }

Answer 1

The Realtime Database only supports queries on single field property. I have explained in one o my answers:

• How to sort Firebase records by two fields (Android)

How to solve such a situation by creating an extra field to keep the other values. Unfortunately, that workaround doesn't apply to all situations.

Besides that, as far as I know, there is no library that does that automatically in Android. However, there is one for the web, written by David East called Querybase .

So unlike in the Realtime Database, Cloud Firestore allows compound queries . So I recommend you try that.