firebase-realtime-database

问题 I am trying to receive the JSON value from the Realtime Database of Firebase using Unity. I do the following: FirebaseDatabase.DefaultInstance .GetReference("Leaders").OrderByChild("score").GetValueAsync().ContinueWith(task => { if (task.IsFaulted) { Debug.LogError("error in reading LeaderBoard"); return; } else if (task.IsCompleted) { Debug.Log("Received values for Leaders."); string JsonLeaderBaord = task.Result.GetRawJsonValue(); callback(JsonLeaderBaord); } } }); Trying to Read the

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 8 months ago . Improve this question I am building a flutter auction application, I am stuck at the countdown time of an auction product so I use firebase realtime database. I have to make sure all users see the countdown at the same time. Please help me whether it's just a keyword to search

问题 I am trying to retrieve data from my Firebase database, but my screen is not showing anything. I don't see any errors so I don't know why nothing is happening. Can anyone spot any mistakes? I followed the FirebaseUI guide with some help from a stackoverflow member. The data should show the street and the user on the screen Fragment: public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_stopandmap,

问题 I'm trying to do a search using Firebase. I have this in my VueJS Code. export default { data () { return { listings: [], searchData: { keyword: "" } } }, name: 'SearchScreen', components: { ValidationProvider, ValidationObserver }, firebase: { listings: listingsRef }, methods: { search () { console.log(this.searchData.keyword) listingsRef.orderByChild('location').equalTo(this.searchData.keyword).on('value', function (snapshot){ console.log(snapshot.val()) return{ listings: snapshot.val() } }

问题 I just started using firebase and I'm amazed of how simple are complex things, and how complex simple things can be. I need to check if a user exists in my Firebase database, and if exists, I need to get its key and value. I have the key and I try to find it in the DB by going to my user subtree and loking for a child with the same key (ID) DatabaseReference root_firebase = FirebaseDatabase.getInstance().getReference(); DatabaseReference users_firebase = root_firebase.child("Users");

问题 I was wondering what the difference between database.getReference("foo/bar/123") and database.getReference("foo").child("bar").child("123") is? I'm assuming that the later one will load the complete "foo" object whereas database.getReference("foo/bar/123") just loads the "123" object? Is my assumption correct or what is the correct / most efficient way to only load data of "123"? 回答1: The two are equivalent. You can inspect this manually this by printing the toString() format for both

问题 -uniqueid1 latitude: 30.7188235 longitude: 76.810132 -uniqueid2 latitude: 30.7188235 longitude: 76.810132 there are 1000 such records in firebase , I want to find uniqueids closest to a specific long/lat.I started using startAt() and endAt() but no success.How do we implement conditional clause and multiple queries.The query me looking for is SELECT uniqueids from table where (lon-specific_lon)^2+(lat-specific_lat)^2<CONSTANT. 回答1: What you're looking for is part of Firebase's Geofire library

问题 -uniqueid1 latitude: 30.7188235 longitude: 76.810132 -uniqueid2 latitude: 30.7188235 longitude: 76.810132 there are 1000 such records in firebase , I want to find uniqueids closest to a specific long/lat.I started using startAt() and endAt() but no success.How do we implement conditional clause and multiple queries.The query me looking for is SELECT uniqueids from table where (lon-specific_lon)^2+(lat-specific_lat)^2<CONSTANT. 回答1: What you're looking for is part of Firebase's Geofire library

问题 I am trying to paginate in Flutter with firebase realtime databse. I have tried this in Firestore and it works fine there but I want this with realtime database. I am fetching data for the first time like this. Widget buildListMessage() { return Flexible( child: StreamBuilder( stream: _firebase.firebaseDB .reference() .child("chats") .child("nsbcalculator") .orderByChild('timestamp') .limitToFirst(15) .onValue, builder: (context, AsyncSnapshot<Event> snapshot) { if (!snapshot.hasData) {

问题 I am working on an Android app and trying to use Firebase Database. I tried to write data to the Database but nothing was showing up (checked via Firebase console). I have Firebase libraries in the build: implementation platform('com.google.firebase:firebase-bom:26.2.0') implementation 'com.google.firebase:firebase-database' My Firebase Database URL as per Firebease console is : https://xxxxxxxx-xxxxxxx-default-rtdb.europe-west1.firebasedatabase.app/ whereas when I get a reference to it from