I want the application to create a unique 4-digit code and save it to the firebase database. This code will not change when the app is exited and entered again.How do I do that?
Example Image
Starting talk about the combinations.. this type of code (4-digits) can give life to only 10.000 users. If your app has 10.001 user, probably it will crash or will be unusefull.
Avoiding talk about the combinations, instead, firebase can't do this with its API or premade functions. You need to implement this with you code, in the android app or (recommended) in some "Functions". If you don't need that this code is random, you can have a field on your database that do as a counter.
Every time an user need that his code to be created (for example on registration), you simply retrieve the counter value on the db and increment, assigning it to the user code field. In this way, the first user of your app will be the code 0000. The next, will have 0001,0002,etc.. The last user that can be registered will have the code 9999.
As said above, retrieving the user data from database after the registration, you'll have the previous saved user code too, so it will not change.
If you need more help, please tell us more about your app or scope.
Related
I have done phone authentication linked to my project but I am not pushing the data from android instead I have manually entered the user data in Firebase. And I want to retrieve the data from firebase using OTP verification and I just need to search the specific user data with phone number which I am entering while login. I want to show all fields to be displayed which are present in my firebase database into my android project.
I've tried many methods to receive the data but I am stuck... Please help me.
Database structure
Authentication panal
You need to logically bind your authenticated user and the data that you stored in your firebase. As per the image in your data base 'id' of the 'Users' are 1,2,.. like that. Instead of that you can use 'UID' of users as an an Id in your database. Go to your 'Authentication' section, you will see User UID against each registered user. Copy that and use as an ID while creating data in database. This will help you to get the data with reference like Users\. Hope this will solve your problem.
I have been looking for this quite some time now and i haven't found any answer related to my problem, so before you tag my question duplicate, at least read it first.
First i have just started firebase and only know basic things about it, i am trying to make a simple single user (1 to 1) chat app.
I want to get the number of users logged in in the database.
I have a child to the root of my database called users which have the list of the users who have logged in.
I know about the datashot.getchildrencount() but that works when some update/event happens, but i want it to give me the number of users whenever i want, not only on some event (For example in messenger number of current active users are shown continuously,i dont want active user tho, i just want total logged in users).
I thought of the another way to make a child called NumberofUsers so i store number of users there but then firebase dont allow to getvalue of the child,only set value (it does allow to get value but only on some event). Any idea what should i do?
UPDATE
i thought of another way to do this, though its not working at the moment but i think solving it is easier than thinking of another method to solve my original problem.
so I made one more child of NumberofUsers with key "02" and random value. now everytime i want data of "01" i change the value "02" after enabling the addChildEventListener for "NumberofUsers". Code that does this. Error its giving me. .new database.
Apparently I cant access child data using datasnapshot, any solution?
Any idea how to solve either of this?
Thank you.
Unfortunately, there is no way in which you can read data from a Firebase Database without attaching a listener. Regarding Firebase, everything it's about listeners. In your case, i think you want a callback to be called once and then immediately removed. If so, i recomand you using addListenerForSingleValueEvent() method to simplify this scenario. It triggers once and then does not trigger again.
This is useful for data that only needs to be loaded once and isn't expected to change frequently or require active listening.
Hope it helps.
I am developing a social network app that uses Parse.com as a back-end
I gave users the ability to change their name , email and profile picture (which is a parseFile)
And when users are logged in i gave them the ability to add posts
I add the posts by getting the user email and name by
ParseUser.getCurrentUser()
and saving the returned content to my ParseObject
but now the question is what if the user updated his data which is the profile picture or name or email how to update the post data dynamcly
You're going to have to write some cloud code. https://parse.com/docs/js/guide
I would create an beforeSave trigger for your users, check to see if the relevant fields are 'dirty' (have been changed), and, if they have been, create a new object of a customer class that just has a pointer to that user.
Save a pointer to the user on each post.
Create a background job that runs each day/hour/however often you want to do these updates that goes through all of your custom objects that contains a user, use Query.each() to go through each of those objects, and then do a query for all posts where the user key is equal to the user of the custom object. Then set the name/email fields as appropriate.
Make sure that when you're done, you delete all of the custom objects so that you don't continuously perform this job on more and more objects each time.
Alternatively, you could just add the user pointer to the post, and when you fetch your posts, include the user key, so that gets fetched as well. Then you can read the name/email directly from the user, which will always be dynamic. You have to make sure that your ACLs are set up so that users can't edit all of another user's info or something, though.
I am new in android. I am developing android app and using http://parse.com API. I want to implement two types of user Student and Company. Basic signup form has the same fields. Later, I want to add additional information related to the user and specific for each type. Now, problem how to save user information for different type of users?
Make a column of userType in parse user table to differentiate user category.
And save user type during sign up and it's information.
I am also using this method because my application also has three end user.
This is working properly for me.
Hope this may helpful for you.
The set-up:
I have an android application that so far can register a user by inserting values into a remote mysql database. I'm now trying to implement the log in.
I was thinking that I can add a "logged in" column to the user table in the database that would store whether or not the user was logged in. Then I would have a trigger that would log the user off after a certain amount of time has been elapsed.
The application's use is to retrieve files based upon if the user has access to a certain file. For this I have an "access" column in the user table table specifying the access a user has to a certain file. I was thinking that when a user clicks an item in a list the application would send their login information and the server would determine if the information was correct then check to see if they had access to the specified file then send back the file if the information is correct.
The problem I'm having though is that checking the registration information takes about 2 seconds alone(due to connecting to the socket and sending a string over the network) and if I try to check both the login and the access id it would take slightly longer.
I feel as if I'm trying to reinvent the wheel but I can't find any viable resources on this matter. Criticisms? Suggestions?
(I wouldn't mind doing a complete redesign I just need to know where to start)
Never connect a client to a db-server. There's no way to intercept hacking attempts, because privileges are very basic (SELECT, UPDATE, etc., they ignore the query):
UPDATE users SET name='%s' WHERE userID=%i // where %i will be defined as the real userID
Above should be a valid query to update the user's account-information, however, a hacker can easily intercept this and change it into:
UPDATE users SET name='%s' WHERE userID=15 // ... or any other variable
Instead, you should create a web based API which will validate each query, or better, support only specific API-commands:
account/update.json?name=%s