I am developing a web app that will be used by individuals in various locations. There is a relatively small mysql database on my server. The thing is at times the users may not have internet access. Is there some sort of hybrid framework/language that I could use in this case.
To be more clear, the program needs to do some fairly rigorous calculations and it needs to fetch values from my mysql database. I can solve this problem using php and mysql. The problem is what happens when they do not have connectivity?
A fine solution is they could download a local copy of the database in the morning while traveling (what are some good light weight DBMSs in this case?) Then they need a client based program (javascript?).
I'd like to reuse code for both instances which rules out php.
Thank you for any suggestions.
HTML 5 have local storage (like database) and you can use in this case. But not every browser support that now.
http://diveintohtml5.info/storage.html
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I’m webGL engine developer (ThreeJS) in small company. We have some events in few weeks and my boss just told me that i have to make registration form as soon as possible, also one page should show names, lastnames and company of all registered members. Problem is that i’m very bad in databases and i have really small amount of time to re-learn it. How can i store registration data on Server without Database? I looked up on web and most instructions are unclear(because i’ve not worked on database before) and others are using localstorage (as far as i know its used for cacheing data)
What you're looking for is a flat file database system, try taffyDB it basically use Json to store its data or Papa parse that uses CSV files, you can easily edit with excel for example.
If you're really good with javascript you can consider using a real database after all,mongodb is a bit advance but still not as complicated as mysql or even sqlite.
I want to create a score keeping app that allows me to enter scores into the app, save score history by user, and have a webpage that can display the score in real-time as well as pump out some stats on previous games.
I've been doing some front-end development the past few years and I would say that my CSS/HTML/Javascript skills are intermediate. I have a rough game plan on how it would work, but having very little backend experience there are some gaps in my knowledge that I need help with.
The app: I would build it with what I know: CSS/HTML/Javascript. I would it to be assessable via a webpage or native app. The plan for the latter was putting it through PhoneGap.
Database: SQL? This is were I would save the scores.
The webpage: This is where things get tricky. I need live reporting for the current game status. Web sockets?
I would use a Javascript graphing library to create charts of stats based on current and previous game history. I need that data to be automatically refreshed (AJAX) but how would I do that with a SQL/JS interaction?
Also, ideally the graphs on the webpage would allow visitors to copy and paste iframe code so they can paste the stuff into their own website. I don't even know where to get started with that.
I'm not sure if I'm even asking the right questions so any help would be greatly appreciated!
Since you're a front-end developer I think you'll really like http://nobackend.org/
There are a number of Back-end as a Service solutions which handle both data persistence and data synchronising across multiple devices.
These solutions answer your SQL and WebSockets questions. You could implement these yourself using either open source solutions or by combining a number of services. But I'd give the BaaS options a go.
I'm having quite an annoying issue. I'd like to begin developing an iOS app, but I'd rather not learn Object-C due to time. I'm looking at PhoneGap, but have one issue.
If possible, I'd also like to sync the data across multiple devices. I'd rather not use a remote database, as I have no idea what the expected amount of users will be, and therefore no idea how much bandwidth I will need for a MySQL database. Is it possible to save data to txt files, then upload them to Dropbox using JavaScript (and all on PhoneGap)?
Really i think learning the language is a relatively simpler challenge. It's learning the API itself that will take time, and you will have that issue regardless of where you go. If you prefer the javascript syntax, i know there is Titanium Appcelerator. But given the features you want, I think learning objective-c is the way to go, because there are so many resources for using the API. I know of a few apps that use Dropbox as storage. Byword is one of them.
Depending on the app you are building, dropbox with flat files might suit your needs. If you need something more customizable, then you may need to build a remote db server. Though understand that sync is hard.
I'm trying to build a phonegap app for ios and android. It's been going well so far but now I hit a major obstacle and I need some help.
I need to connect to a remote Postgres database. I haven't done anything like that before.
Does anyone have any experience/tips for this, or know of any resources which contain relevant information?
From client-side javascript, you can't. Unless phonegap has done something very odd with permissions or provided a PostgreSQL interface (which presumably you'd know about if they had).
What you'll want to do is provide a small server-side wrapper to PostgreSQL that will take requests, convert them to queries and return (presumably) json-formatted results. Oh - and you'll need to think about security too - who can connect, what can they do, does it all need to be encrypted?
If your requirements are simple, this can be easy enough to do in Perl/Python/Ruby etc. or even javascript if you have node.js to hand. With Perl you'd wrap DBIx::Class in a Dancer app - similar modules exist for all the above scripting languages.
Do consider whether you want to run the whole thing over https (let apache handle this for you) - it will avoid issues with passwords/private data being sniffed over wireless connections.
For example, your app would issue an ajax request to: http://myserver/projects/123/messages?limit=20&sort=date
That would be translated into a query into the project-messages table for the last 20 messages sorted by date and wrap the results up as an array of JSON objects (presumably).
You would need to create an API for your data. Then access that API using promises from your js app.
To let the security issues where they belong to (in existing experienced and tested parts of server / client software) and to have a minimum effort of development, I suggest to use some existing lightweight middle ware:
http://restsql.org/doc/Overview.html
It comes with a docker, where any service you require is packed in, thus making it easy to try it out quickly.
I'm going to build an webbased application which is controlling and monitoring tons of realtime data. think about few thousand valves pipes pumps and sensors.
Please list a technology stack you would use to build a realtime website with an educated guess about performance. The environment is 'ideal' all openstandards are available. so no IE6 etc backward compatibility is needed. Current and future proof technologies please.
server side:
database web-server - which one / combination makes it easy to support real-time pushing of data?
client side:
what kind of client environment (javascript Libraries) support showing and updating tons of realtime data?
You can have a look at Goliath
I recommend you have a look into Socket.IO which works best with Node.JS and might be the best fit for handling many long lasting concurrent real time connections. I would say that the choice of the database depends more on where your real time data is coming from and how it is supposed to get in the database.
Me too. So I'm writing a frame work that can do that. It's based on lighttpd front end, and multiple fcgi backend servers. The original Android was also tested with another framework that is based on it. It's open source so you might want to use it as a starting point.
I haven't been able to write a realtime app, but I've dabbled a bit with http://socket.io/ and node.js, and it's a joy to get started with.
App engine has a js channel api which seems nice. You should take a look to see if hosting on app engine is a option.
If you're dealing with "real time" stuff server-side, I recommend clojure for managing concurrent state.