CODEWITHSUNDEEP
androidfirebasefirebase-realtime-database
Alex
Alex

Reputation: 77

Retrieving data from particular nodes firebase Database

I am developing an android application and now I am stuck in retrieving data from particular nodes like I want to retrieve only one value from each nodes. The database structure shows below.

Database Structure

How can I retrieve the second unique id that created by Firebase database?

Upvotes: 1

Views: 1641

Answers (2)

Alex Mamo
Alex Mamo

Reputation: 138824

To get the value of appointmentStuts only from the first object, please use the following code:

DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
Query query = rootRef.child("Appointments").child(PostKey).limitToFirst(1);
ValueEventListener valueEventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String appointmentStuts = ds.child("appointmentStuts").getValue(String.class);
            Log.d(TAG, appointmentStuts);
        }
    }

    @Override
    public void onCancelled(@NonNull DatabaseError databaseError) {
        Log.d(TAG, databaseError.getMessage());
    }
};
query.addListenerForSingleValueEvent(valueEventListener);

Upvotes: 0

Gastón Saillén
Gastón Saillén

Reputation: 13129

First create a POJO class to get the values you want, it should be writen the same way as you have them in Firebase.

public class AppointmentsPojo {

    private String appointmentStuts;

    public AppointmentsPojo(){

    }


    public String getAppointmentStuts() {
        return appointmentStuts;
    }

    public void setAppointmentStuts(String appointmentStuts) {
        this.appointmentStuts = appointmentStuts;
    }

}

Then just loop inside Appointments to get each appointmentStuts

mDatabase.child("Appointments").addListenerForSingleValueEvent(new ValueEventListener() {
  @Override
  public void onDataChange(DataSnapshot dataSnapshot) {
    //Looping inside Appointments to get each appointmentsStuts
    for(DataSnapshot snapshot: dataSnapshot.getChildren()){
    AppointmentsPojo ap = snapshot.getValue(AppointmentsPojo.class);
    //Getting each appointmentStuts
     String appointmentStuts = ap.getAppointmentStuts();
     //To get each father of those appointments 
     String key = snapshot.getKey();

      Log.e("Data: " , "" + appointmentStuts );

       }

  }

  @Override
  public void onCancelled(DatabaseError databaseError) {
    System.out.println("The read failed: " + databaseError.getCode());
  }
});

Where mDatabase is

DatabaseReference mDatabase;

mDatabase = FirebaseDatabase.getInstance().getReference();

Upvotes: 1

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