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I am new to android to SQL Brite. i need to learn about SQLBrite how to use and why to use it.I searched in google but there is not much explanation about it only some GitHub codes which is very difficult to understand.
anyone please explain about SQLBrite?
A lightweight wrapper around SQLiteOpenHelper and ContentResolver which introduces reactive stream semantics to queries.
Instead of single executions, you can subscribe to queries using RxJava observables:
No attempt is made to hide SQL, Cursor, or the semantics of SQLiteOpenHelper (Android’s SQLite wrapper). Instead, those three concepts are given a superpower: data change notifications.
Whenever data in a table is updated from insert, update, or delete operations (whether in a transaction or as a one-off), subscribers to that data are updated.
When multiple queries are constantly refreshed with data, the UI updates in real-time instead of staying as a simple, static page.
For more reference : https://corner.squareup.com/2015/02/sqlbrite-reactive-sqlite-for-android.html
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I have an android app that constantly inputs data on a database (sqlite).
every 3 or 6 seconds (sometime is less than that) I insert data into the DB.
I created a DatabaseHelper (SQLiteOpenHelper) object which does that but I've been wondering if its better to close and create a new DatabaseHelper object each time I input data or if its better to keep it open?
It's better to use a single connection throughout your whole app, it's explanied here.
Also you could use ORM Lite.
But keep in mind that you should use ROOM, from Android documentation:
We highly recommended using the Room Persistence Library as an
abstraction layer for accessing information in your app's SQLite
databases.
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I have been looking into how databases work in android and have been learning MVVM (Model–View–ViewModel). But I am seeing a lot of examples of SQliteOpenHelper being used here rather then MVVM.
After learning MVVM, I am starting to get confused about SQLiteOpenHelper(Though I have not learned anything about it). I do understand that MVVM is the standard and that MVVM has SQLite in it, but when I look at examples of SQLite in stack overflow, I am seeing cursors and stuff, which I do not know.
For the application that I am planning to make is using MVVM or SQLiteOpenHelper better?
The data that I need to store in column is date, Something, something, something. So just four columns of data. I will be storing data locally.
I do like MVVM though, but does it go well for my purpose?
MVVM is a software architectural pattern and not a particular implementation. The database itself should reside within the Model portion of your code. Here SQLiteOpenHelper comes into play. It's the standard to access databases in Android. Therefore any actual implementation you choose relies on it as well.
To get started with databases you should consider using Room as it's an abstraction of the database, providing DAOs and Entities. No need to implement an SQLiteOpenHelper or handle cursors.
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i am using a FirebaseecyclerOption, but i don't know the use of it and also tell me how it perform it to populate and store data in model class, like it execute each time or its store all the data in the option and populate it into the model class please explain thanks, and another question is how we can get only limited items from the database.
The FirebaseRecyclerOptions class controls how FirebaseUI populates the RecyclerView with data from the Realtime Database. At a minimum you pass it a query or location to get the data from, and a Java class that will be instantiated to hold the data from each row in the view. For more on this, see the documentation on using the FirebaseRecyclerAdapter.
To limit the data shown you have two options. You can either point to a location with less data, or use a query to limit what data is retrieved. The FirebaseUI documentation on querying shows an example of that, and you find even more examples in the regular Firebase documentation on sorting and filtering data.
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I am trying my hands on Room and RxJava. I fairly new to both. My code is working fine but I was interested to know about the best practices.
Imagine an object with 10 fields say CompleteSong. In my app, I am making room return a Flowable<List<CompleteSong>> Whenever I make an update in the database, the Flowable updates with all the values. I am displaying that list with a RecyclerView. I have two possibilities to proceed with i.e.
1. I can store the object that is being changed and wait for the Flowable to update. When the flowable updates I update 1 item of RecyclerView
2. I can update the RecyclerView when the Flowable updates parsing through the list and looking for the changed instance of CompleteSong
I used to use the former approach, it seems to be less reactive but optimized whereas the latter seems to be more reactive but at the same time less optimized.
Can someone instruct me on this, what should be done? What approach should I follow or there's something else that I couldn't discover.
Note: I am new to reactive, so please consider updating me on the terminology if I messed something up.
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it's my first post on Stack and i need to have a database to store some information in a server and i don't know what is the best approach to use, i have the choice beetween SQL DB and Firebase. which one will you advice me? keep in mind that maybe i gonna need to send some request like "SELECT * FROM s INNER JOIN s1 WHERE c.."
thanks
look at this
and look at this too
The Firebase database does not have the equivalent of SQL's WHERE id IN (1,2,3). In the case of selecting by ID, Firebase's way of retrieving items is equally fast.
In Firebase you must write little bit hard code. And you will get and send data in realTime.
But in SQL if you are not using sockets or etc. you must make call to get data.
For your case , as I see you are beginner, use simple SQL database. Loopj or Volley library. Make practices with JSON.
Hope I helped you.