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I have a school Management system and school have more branches they say we should have one common db
and i think i will host my db but i dont know who i can make a connection wirh desktop application and online database
I think it's a terrible idea exposing your database to the internet. Much better solution would be to write a Web API that is exposed to the internet which both the web and desktop apps use to perform their tasks by interacting with the API.
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I'm trying to find the best way creating a mobile application, and connected with a cloud database(or server).
So my first question is: Is it good practice to communicate directly into a database from a mobile app?
If yes, which is the best database for this work? Azure? Oracle? Firebase...?
If no, which is the best service to communicate first? And which protocol?
What is the most recommended way? Does it matter what os(windows?mac?) my server will use?
The best approach if to build a REST API to communicate with your server. But if you don't want to do that, you should look for Firebase. Firebase is one of the best platform to build mobile and web application really fast. It provide you with Authentication, Real-Time Database, Storage, hosting crash reports and many more. Using firebase, you can set security rules on who can write to you database thus it eliminate the risk of unauthorized access to the database.
Also keep in mind that, if you use firebase, you should structure your db in such a way that the number of read and write requests are as minimal as possible, as firebase could be a bit expensive if not used properly.
Its better to build a api in between. Doing queries in your app is kinda risky.
You could use a nodejs framework for this e.g. Sails.js or Express.js
For a cloud database, Firebase is a very easy to implement and work with Database. There are plenty of information resources about the setup and work process.
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please tell me how to retrieve a data from online database(table)?. I just created a table in enter link description here
And I made a SQL database. And can anyone tell me how to retrieve a data from that?
It is strongly advised for you to not directly connect to a database straight from Xamarin for (at the very least) 2 distinctive reasons:
1. Your credentials for the database will be in your app code, meaning anyone can just decompile your app and read your login info - huge security risk.
2. By connecting to a online database straight from Xamarin you'll most probably overload the database server (they allow only a small number of connections).
Usually when you need data from a database you work with an API that you build yourself. For example A php site, or an ASP.NET web api.
Xamarin communicates with your web site (e.g. www.yoursite.com/api/getinformation). This way your credentials are safe in the website, and your app connects only to your site, which is better because you can cache information there, preventing an overload on your site.
Reading material that will help you:
Xamarin forum link to php+mysql+Xamarin
Consuming REST-API's with
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I'm making a game with a login system which connect to a database, but my source code is not crypted and I worried about if someone decompile my program, he can get the SQL logins and wanted to know how prevent from that?
Since .NET Framework 2.0, there is a possibility of encrypting application configuration sections. However, it needs a bit of implementation.
Please refer to the following article.
https://msdn.microsoft.com/en-us/library/53tyfkaw(v=vs.110).aspx
Just another option... You can consider using "Integrated Security=SSPI" in your connection string. This will try to open connection to database with the user running your application main thread. However, this will require additional management on the SQL server side for permissions of the user but you won't be providing any usernames or passwords in your connection string.
And a note... Although i partially agree with Roblll with the comment on research, sometimes people need advice for the concept. If concept is not there and you are lost, you cannot share a line of code right? I think stackoverflow is a great platform to ask and learn from replies. So keep on asking... Do your homework and don't be shy! :)
Cheers
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when i connect share point data source in my light switch HTML application have one exception
listdata.svc
does not appear to be a valid site SharePoint 2010 (or later) with an installation of WCF Data Services is required.
I think it's an authentication error to connect to the service.
the service actual path is :
http://[YourSharePointSite]/_vti_bin/ListData.svc/
make sure you able to access this path and you enabled external access to it
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I am a web service applications beginner.
I wrote a web service application and a simple web client application in order to test the service.
It works fine, but i found out that even when the service application (that runs another application) is off, i can get the result at the client side.
Is it ok? If not, what could be the problem?
I can only think of two possible explanations -
Either pages are cached somewhere (client, proxy servers, web servers) or the client does find a server (as in - it isn't off, or it doesn't go to the server you think it is)