How to Make Offline Database for My App

How to make offline database for my app?

I think what are you asking for is a mechanism to persist data into your application. There are several approaches to achieve this. Although it could be too broad to provide detailed answer, you might want to check as options:

Databases:

• Core Data:

Core Data is an object graph and persistence framework provided by
Apple in the macOS and iOS operating systems. It was introduced in Mac
OS X 10.4 Tiger and iOS with iPhone SDK 3.0. It allows data
organized by the relational entity–attribute model to be serialized
into XML, binary, or SQLite stores. The data can be manipulated using
higher level objects representing entities and their relationships.
Core Data manages the serialized version, providing object lifecycle
and object graph management, including persistence. Core Data
interfaces directly with SQLite, insulating the developer from the
underlying SQL.

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• SQLite -with a wrapper such as SQLite.swift-

SQLite is a relational database management system contained in a C
programming library. In contrast to many other database management
systems, SQLite is not a client–server database engine. Rather, it is
embedded into the end program.

_{Wikipedia resource.}

• Realm:

Realm is an open-source object database management system, initially
for mobile (Android/iOS), also available for platforms such as Xamarin
or React Native, and others, including desktop applications (Windows),
and is licensed under the Apache License.

_{Wikipedia resource.}

Other Alternatives:

• UserDefaults:

The UserDefaults class provides a programmatic interface for
interacting with the defaults system. The defaults system allows an
app to customize its behavior to match a user’s preferences. For
example, you can allow users to specify their preferred units of
measurement or media playback speed. Apps store these preferences by
assigning values to a set of parameters in a user’s defaults database.
The parameters are referred to as defaults because they’re commonly
used to determine an app’s default state at startup or the way it acts
by default.

• Saving Data to plist files:

In the macOS, iOS, NeXTSTEP, and GNUstep programming frameworks,
property list files are files that store serialized objects. Property
list files use the filename extension .plist, and thus are often
referred to as p-list files.

Property list files are often used to store a user's settings. They
are also used to store information about bundles and applications, a
task served by the resource fork in the old Mac OS.

• Saving Data to json files:

In computing, JavaScript Object Notation or JSON is an open-standard
file format that uses human-readable text to transmit data objects
consisting of attribute–value pairs and array data types (or any other
serializable value). It is a very common data format used for
asynchronous browser–server communication, including as a replacement
for XML in some AJAX-style systems.

_{Wikipedia resource.}

I have an offline SQLite database, I want to make it online and work with it

First of all the default Android database is SQLite. It is an embedded DBMS. SQLite is not a client–server database engine.

TL,DR You cannot provide access to the local database on your device.

The most common way to interact with the backend is to create a REST API/JSON RPC/... and query the backend server for data.

On the backend side, you may have any DBMS you need, but end clients will be abstracted from these details via API.

Of course you can query a database server directly using MySQL, PostgreSQL,... drivers but that is not recommended.

So all in all, you can keep your local data stored in the local database and periodically upload data to the server or you can just interact with the backend without caching data locally. In the latter case, you will be always in-sync.

Hope I explained the matter.

How can i make the app work offline with Firebase database

Simply activate offline persistens as specified in the official documentation:

Firebase applications work even if your app temporarily loses its network connection. You can enable disk persistence with just one line of code:

FirebaseDatabase.getInstance().setPersistenceEnabled(true);

Offline application - database

You can either use SQLite with SQLite-NET or SQL Server Compact Edition for an offline database.

Quick edit: here and here is a comparison of SQL Server CE vs SQLite.

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