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Mysql database alternatives if Mysql isn't an option

I'm working on an app using Unity. This app is supposed to upload certain simple information at specific points, which is why my original plan was to just connect it to a Mysql database. Unfortunately Unity doesn't support the NET 4.0 framework and nothing I've tried seems to work.
Yes I could use PHP scripts hosted on my web server to add and pull information, but I'd rather do it all from the app itself if at all possible.
The data I need to record is pretty simple, IDs, ints, strings, nothing too complex.
So I'm now trying to look into alternatives to Mysql.
JSON
So far I have gotten SFTP to work (By using the Renci.SshNet library) and the app is now uploading files in my server's home directory. So my original idea was to just create JSON files with the data and edit them remotely.
Is this something that could be done with C#? How? Any specific resources?
The alternative to remote editing would be to download the JSON file, edit it locally, and then upload it again, but that doesn't sound like a very smart idea.
I have found this answer but it's unclear to me if it requires to send the whole JSON file to the server after every edit or if it's possible to just edit it from the app. Some clarification would be great.
SQLlite
I've also looked into SQLlite but I'm also unsure if it could be remotely edited.
I've Googled it multiple times but can't really find any useful information.
What are my options at this point? What should I use if I needed the equivalent of a Mysql Database that can be remotely edited and read?

You can start seeing into Google Firebase project
https://firebase.google.com/docs/database/unity/start
But unity 2018.3 does support Net 4:
https://learn.microsoft.com/en-us/visualstudio/cross-platform/unity-scripting-upgrade?view=vs-2017
https://blogs.unity3d.com/es/2018/07/11/scripting-runtime-improvements-in-unity-2018-2/
https://blogs.unity3d.com/es/2018/03/28/updated-scripting-runtime-in-unity-2018-1-what-does-the-future-hold/

How to programmaticaly change the path of a msaccess linked table

I´m looking for a solution to do so using c#.
I have 2 msaccess db and I copy them to user´s machine at the firt execution of the system. Between these dbs I have a linked table which I need to change the path to the user folder.
I´ve looked around but I couldn´t find anything.
Any help will be appreciated.

I had this problem some time ago while using VBA, which is probably easier to interface with Access than using C#.
However, after trying out several unreliable options I ended up just dropping the link and creating it from scratch. I would first retrieve all options used by the linked table, replace the database location and create a new linked table with those options, imitatng the old link.
After a quick search I found ADO.NET way for creating a linked table and How can I link an external Access table via .NET? that should help you with doing that in C#.

Using the right search method in windows 8 app

I'm creating a Windows 8 app that can upload content from the local machine into the app (for local storage). I need to search through this content. What is the preferred strategy to use to incorporate this search functionality?
I have been trying to use the SampleData.json and SampleDataSource.cs from the grid template app as a starting point, but to me, it seems like the SampleData.json file will need to be updated each time new content is added to the app, seeing that data is populated from the SampleData.json file.
I have been going through the tutorial from MSDN:
Is there any other tutorials or advice anyone has for me? I need to incorporate this asap

Windows can index files for you, and then you can use the StorageFolder.CreateFileQuery[WithOptions] APIs to search via properties. If you place content inside a folder called "Indexed" in local or roaming app data, then indexing happens automatically and queries execute very quickly. You can also store the content in "appcontent-ms" files if that works better.
There's also the [Windows.Storage.Search.ContentIndexer][2] API for nonfile content or content that can't live in Indexed appdata folders. The ContentIndexer has its own query methods.
For all the details, see the section "Indexing and Searching Content" in Chapter 15 of my free ebook, Programming Windows Store Apps with HTML, CSS, and JavaScript, 2nd Edition. Even though it's using JS as the language, much of the book is just about WinRT so it's entirely useful even if you're working with C#. And it's free, so there's nothing to lose!

Windows Application or web application for this purpose

I have about 5000 csv file and I want to insert them in a sql server 2008 database.
I don't whether windows application or web application is better.
each csv file is simple a one row with 36 column that will be inserted in an one table in the database.
thanks for your help.
Update 1
This application will be used on a computer that can connect to the database, it is used by the admin just once, in order words, there are people who responsible to write these csv files, then all the files, come to me and I have to insert them in the database
Update 2
Thanks for the user who are trying to help me.
You gave me these options:
bcp
SqlBulkCopy
Windows service
what is the best please? I told you all the requirements, which are very simple.

Depends how you want to use it - if you want to deploy to lots of people so they can upload a file and process it into a database, make it web.
If on the other hand, you only have a couple of users which you can easily deploy an app to, there is a lot less infrastructure required to write it as an app.
Sounds to me, you want to automate the mass loading of lots of files, so windows app is jumping out at me.
All depends on what the overall requirements are.
Based on your edit, write a win app that uses a folder enumeration, reads the records and passes to a SqlBulkCopy object.

based on your comment I would take an aproach like that:
Easy to use gui solution:
1. Make a website for people that are making the csv's
That website would preform and check's that are necesery and display any errors. Error checking is done by the Web service (more future proven imo).
Create a webservice importing the file to database and sending you an email. That way you don't have any work with putting the data into the database
Implement an aproveal mechanism so you need to aprove the new inputs to the database if needed
Easy to implement solution:
Create an application (Console/WinForm/Web) that uses the bcp tool to import the data and handles errors

Simple querying a database using apps for office?

I am trying to begin writing my first app for office.
What I would like to do is simple. I have a database of IDs for my customers. When I hover over one of these IDs, I'd like the app to query a database and display the customers info on the right hand side of the app.
This should be a pretty simple thing to do using apps for office, but I can find no guidelines or help on their web page.
Can anyone provide some simple sample code for doing this?
Thanks very much.

I can say that I spent some time going through this tutorial trying to get a solution for this question. I have a few suggestions about how you will need to proceed in writing your Office App.
I would not advise having the data populate when you hover over an ID field in Excel/etc. You will be hitting your database too many times. I would have set it up, that the user with select a cell with the ID in it and then in your app panel, there will be a button click or event that will make a call to the SQL Server to return the data.
You will need some sort of a web API that you can use to retrieve the data from your SQL Server. The event will pass in your ID that the user selects and then the web API will return the customer details to be populated in your app panel.
Setting up the App Panel seems pretty straight forward in the tutorials on the MSDN site. You can set it up using HTML and CSS to design the page.
I think the biggest thing that you will have to do is set up the API to access the data.

I think these official Microsoft examples will help you a lot.
Example 1 (Bit complex)
http://msdn.microsoft.com/en-us/library/fp142290(v=office.15).aspx
Example 2 (Looks Easy)
http://msdn.microsoft.com/en-us/library/fp142161(v=office.15).aspx
Example 3 (With using Visual Studio)
http://msdn.microsoft.com/en-us/library/fp179835(v=office.15).aspx
Happy Coding...