I'm developing cloud-based ERP software and my client wants to have a feature where if the internet is down and the cloud is not accessible then a local server can be used to provide the service and once the internet is back cloud can sync with the updates.
Please advise. how to design such model.
Software language: core PHP
Related
I have a web app running with PHP and MySQL.
I need to develop a desktop application which will sync data from the cloud DB whenever the client's computer connects to internet. If the client's computer is not connected to the internet, the desktop application will continue to work offline, using the local DB. The local DB is obviously a replica of the cloud DB.
I don't want to use Microsoft c# to create the desktop application. The desktop application needs to be cross platform and should run on Windows, Mac and Linux.
I have used XAMPP to create a local MySQL DB and have achieved the local app to sync with the cloud app. However, there are multiple problems to that approach.
-- Whenever my client's need to install the local app, they need to call me and I have to install XAMPP in their computer, setup the server, setup the local database and prepare it to sync with the cloud database with their account. They obviously aren't tech savvy so they don't know how to do it themselves.
-- If the client formats his computer, they will call me again and again and I have to set it up for them all the time, which isn't scalable in the longer haul.
-- XAMPP doesn't work when there are other processes running and using common ports. Example - Skype, Quickheal and other antivirus software running will prevent the SQL server to start. Sometimes what happens is that even after I have installed the local app, the client will install an antivirus software or some other tool and my local app will stop working on their computer.
Hence, I need to do away with XAMPP and switch to something else.
SQLite is out of question since it is serverless. I don't want to use .NET either. What I am looking for is this
I want to develop the database driven local application and package it somehow. I want to provider an installer file which will automatically install the database server, setup the database and everything else. The client will only login to the system in the local app and he doesn't have to setup any server. All the work that he does will be synced with the cloud server whenever internet connection resumes.
Please note that there is a master slave work involved. The client will have multiple terminal computers using the master system from other terminals and all these terminal computers will use the local database installed in the master computer.
I have tried to illustrate this with a diagram below
What's the best way to go about it?
I have my application developed with Laravel 5.1 & MySQL. I don't know how to move it to Microsoft Azure.
Can anyone tell me how to deploy to Azure?
I am trying to figure out the costing too, but azure pricing calculator doesn't show MySQL & PHP in the list. Can anyone help with this too??
Thanks!!!
Generally speaking, you can leverage Azure Web Apps of Azure App Services to host your PHP applications. And the MySQL database service is provided by ClearDB on Azure. For dev or testing, they all provide free pricing tier.
Refer to https://azure.microsoft.com/en-in/marketplace/partners/cleardb/databases/ for pricing plans of ClearDB on Azure.
Refer to https://azure.microsoft.com/en-in/pricing/details/app-service/ for App Service Pricing.
And you can refer to https://azure.microsoft.com/en-us/documentation/articles/app-service-web-php-get-started/#create-a-php-laravel-app-on-your-dev-machine for steps of how to build and deploy a laravel application to Azure Web Apps.
Any further concern, please feel free to let me know.
I have an ERP web application ,and
I want to give the application admin the ability to manage network settings of my server operating system from my application.
What are the main network issues which I have to take care about them ?
and Are there any APIs to do that ?
Hint:
My application is written with php, and my server os is CentOS.
I am new at android.
I have some problems with android database and how to deploy it into a server without develop a web site for the application.
I want to publish this app into google play after a while.
so an online web server is needed.
Locally woking is useless for me.
So my questions are:
1) If and only if with using sqlite database, can i deploy my application into a server to make it accessible ?
2) if sqlite is not sufficient for me , then how can use php & mySQl ? and could you please offer me some a kind of hosting services for android applications?
3) I want to manage sending notifications from the server and provide communications between devices. Is there any service to provide my needs ?
Thank you so much.
No you can't...You need to have separate database(sql server/mysql) for your server. And then write some webservice so that you mobile app can communicate with server database.
SqLite is only for mobile device and no server supports it, APIK.
I will be developing an application for a club where they will have visitors use biometric systems(finger print) or magnetic cards to mark their attendance.
This application is planned as a web app, made using PHP/MySQL/Javascript. It does a lot of other things as well.
What I wanted to find out is how is the interface between Biometric/Megnetic Card systems to a web app done?
I've never worked on this and am hoping if someone who has experience with this can throw some light on this as to how this could be accomplished. Any pointers will be appreciated.
Also, we will be hosting this application remotely. So we won't have physical access to the web-server.
(I'm afraid there's got to be some form of application installed on a pc that would interface with the hardware and probably makes calls to the web app. But, if there was a way to connect it to the web app directly, then the app would be easy to deploy to any location with minimal installation.)
Thanks! :)
How is the hardware connected? Directly to the app server, or to a standalone box of some sort? If it's a standalone box, then yes you'll have to have some kind of program on the box collect the data and send it to the web app. If it's connected directly to the app server, then you need to write something that either polls the hardware or receives messages/events from the driver and DTRT wrt the web app.
There three type of communication channels are supported by the biometric machines. They are serial, TCP/IP and HTTP. In your case, you either need to implement TCP/IP or HTTP.
If your application is running the intranet, then you can implement the TCP/IP server application and host at a intranet system which is expected to write in a common database between the biometric application and your web-app.
If your application is hosted at the server, then you can implement the http server and associated the URL with the machine. For this you need buy the http api supported machines. Here is the google search link for finding such machines.