Update Firebase database data

Question

I am trying to update my databse:

This is my code, but it doesn't seem to update the database. (Write access is set to true in Firebase settings)

DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
      ref.child("items").child("1").child("itemAvailability").setValue("Not Available");

Java class

public class Item {
    String itemName;
    String itemAvailability;

    public Item(String itemName, String itemAvailability) {
        this.itemName = itemName;
        this.itemAvailability = itemAvailability;
    }

    public Item() {
    }

    public String getItemName() {
        return itemName;
    }

    public void setItemName(String itemName) {
        this.itemName = itemName;
    }

    public String getItemAvailability() {
        return itemAvailability;
    }

    public void setItemAvailability(String itemAvailability) {
        this.itemAvailability = itemAvailability;
    }
}

@beastlyCoder no changes. I refreshed the firebase conosle, no changes — Efaz
– Efaz, Commented Aug 27, 2020 at 22:33
can you show the whole code you have for accessing the firebase content — beastlyCoder
– beastlyCoder, Commented Aug 27, 2020 at 22:34
@beastlyCoder added. Should I create a method and put the code inside it? — Efaz
– Efaz, Commented Aug 27, 2020 at 22:36
do you have a POJO class set up( with instance variables constructor etc) — beastlyCoder
– beastlyCoder, Commented Aug 27, 2020 at 22:38

beastlyCoder · Accepted Answer · 2020-08-27 22:50:05Z

2

You can do something like this with a Map Data structure.

DatabaseReference ref = FirebaseDatabase.getInstance().getReference();

DatabaseReference itemRef = ref.child("items/1/itemAvailability");
Map<String, Object> itemUpdates = new HashMap<>();
itemUpdates.put("itemAvailability", "Not Available");

itemRef.updateChildrenAsync(itemUpdates);

This will take the item 1's availability and update it's availability to Not Available

edited Aug 27, 2020 at 22:50

answered Aug 27, 2020 at 22:44

beastlyCoder

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3 Comments

beastlyCoder Over a year ago

yes it was, i got it from this tutorial: firebase.google.com/docs/database/admin/…

beastlyCoder Over a year ago

i also made a typo in item, i changed it to the correct word "items"

beastlyCoder Over a year ago

@Efaz did this help?

KalanaChinthaka · Accepted Answer · 2020-08-28 01:08:55Z

0

DatabaseReference ref = FirebaseDatabase.getInstance().getReference();
      ref.child("items").child("1").addListenerForSingleValueEvent(new ValueEventListener() {
         @Override
           public void onDataChange(@NonNull DataSnapshot snapshot) {
              HashMap<String, Object> updateMap = new HashMap<>();
              updateMap.put("itemAvailability", "Not Available");
              ref.updateChildren(updateMap);
              }

         @Override
              public void onCancelled(@NonNull DatabaseError error) {

             }
        });

Might work for you.

answered Aug 28, 2020 at 1:08

KalanaChinthaka

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Comments

KalanaChinthaka · Accepted Answer · 2020-08-28 06:16:42Z

0

Here is the code for Firebase real-time database Insert, Update & Delete operation(CRUD).

//****UPDATE 
var database = firebase.database();
let userRef = database.ref('myroot/items/');
userRef.child("1").child("itemAvailability").update("Not Available").then().catch();

//****Insert 
var database = firebase.database();
let userRef = database.ref('myroot/items/');
userRef.child("1").child("itemAvailability").set("Not Available").then().catch();

//****Delete 
let itemId=1;
let userRef = database.ref('myroot/items/' + itemId);
userRef.remove().then().catch();

edited Aug 28, 2020 at 6:16

KalanaChinthaka

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answered Aug 27, 2020 at 22:55

Abhishek Tomar

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