I've heard much good about nodejs and writting client-server application with it. But I can't get, for example, when developing IM client-server application, how nodejs server script is supposed to talk to database server to actually store it's data? Or may be I miss something and nodejs server scripts are not supposed to do that? If so, please, push me to correct direction.
I've noticed DBSLayer http://code.nytimes.com/projects/dbslayer/wiki, but it looks like it's still in beta.
You need to grab a module that handles the communication to the database you want. See here for a list of modules for node.js. Popular databases that work well with node.js are MongoDB, CouchDB and Redis.
As stagas says, you can use a module that handles communication if you want to use an external database.
If you want an internal (=embedded) database, you can use one written in javascript you can require like any other module such as NeDB or nStore. They are easier to use and useful if your webapp doesn't need to handle a lot of concurrent connections (e.g. a tool you make for yourself or a small team), or if you write a desktop app using Node Webkit
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I would like to connect with React Native to an external database, like PostgreSQL, MySQL or what ever. Is this possible?
But first let me tell you something about my plan:
I will develop my application for multiple installations (multiple devices - one installation on one device). All devices are connected with a local network which is provided by a Windows installation (server). On the server runs a database (PostgreSQL) and I would like to connect to this database with all my devices.
The server (or in fact its database) should store tasks and each device should access to these tasks (read and write) locally.
I had also some other ideas like simple SMB-XML file storage (but the problem with collisions) and an SQLite database on an SMB shared file - but the website of SQLite tells that this will not avoid problems with multiple accesses. Therefore I need another local solution. This brought me to provide a database which is accessible from the local network.
I would be very grateful if someone has a note how to solve this problem.
Thank you!
In order to access a database directly from react native you would need a pure JavaScript database driver. A quick google search produced a JavaScript drivers for PostgreSQL (https://github.com/brianc/node-postgres) but it is written for Node.js and I doubt it will work in JavaScript Core or Chrome. CouchDB works via a REST API and it's actually intended for direct access by multiple clients. There are multiple JavaScript clients available for that.
BUT why do you want your clients to connect to the DB directly? What you describe seems like a pretty standard application model. You'll just need a backend running on your server talking to the DB and providing an API. Good old web development. If you want to write JavaScript on the backend I suggest using Node.js
If you really can't or don't want to write a backend, there are several services that provide API for data storage and even some data processing. But of course they aren't local. Have a look at parse.com or firebase.com for example.
I want to start an information provider service. It works this way:
Some employees will find the information needed and fill a database manually.
Users will request data they need on their client side apps on their own platforms. Some of the project specifications is as follows: 1) Data that will go between database server and clients is really small(Suppose some ordinary images). 2) The client side apps don't need to be kept updated. Once the user of app clicks update button(for example) the app will request the server to send required information. 3)It's important to run client side apps on several platforms like: windows, windows phone, android, ios,... 4) Database doesn't need to be vary fast or vary big.
Note: And It's important to note that I'm not expert and I have some limitations. I know java and html, css, javascript. But I think those are enough for this project. (Am I right?)
So I decided to design this development architecture:
1)Using hibernate and provide a layer for server which stands above hibernate and is used to do database-specific tasks. This layer provides some protocols for client side apps to communicate with server. It enables me to change database later without changing client side apps. 2)Using PhoneGap which is a framework that uses html, css, javascript and produces apps for many platforms.
I really appreciate any suggestion, comment,... Thanks!
The fastest way in Java world would be spring boot. Basically you can configure whole application: datasource, orm, persistance layer and rest services just by adding proper annotations. There are many examples of how to do it. Basically with current implementation of spring jpa and web services you can bind mapped resources to rest services. Also current JPA can generate SQL for you using DAO method name. SO e.g. findPersonByName will generate proper sql for you (of course you need to map your db model in entities but this is also simply done with annotations).
Yes, this is a sufficient tech stack to accomplish your goal. You will have to decide how much logic to implement server-side vs app-side.
Pick a java framework for providing an API so that you can expose a restful API to your apps.
Here are a couple of comparisons from stack overflow:
Which is the best Java REST API?
Easiest frameworks to implement Java REST web services
no! for database you need server side scripting language, like php or perl, java-script is client side and will only work on browser. i recommend first learning mysql database, just the basics how to create Db, table, insert and fetch. then some PHP. i think these will set the ground for your project. '
for development environment : download XAAMP! it comes complete with Sql-database base and PHP.
I'm really new to programming, and I wonder how simple mobile game servers (like flappy bird) are built to store the scores that user made.
If you are new to programming maybe instead of programming your own backend engine is better to use some APIs developed by third party developers. Some examples are on Parse, App42 or Gamedonia. This APIs allows to save data easily and to not have to build your own servers.
The three things you need to know how to do:
Write a program that talks to another program over the internet
Write a program that talks to a database on the local machine
Start a virtual server instance on a service such as AWS and run stuff on it
For a beginner, NodeJS and MongoDB are particularly easy to do this with.
Later it might be a better idea to use an already-made API like Unai mentions, but trying this out yourself first will give you a better understanding of how this all works.
You can also use Facebook scores API for that (how to integrate in unity3d).
I'd like to build a multiplayer web game application in which it supports chat. I presume the application will have to handle hundreds of simultaneous connections.
I'm planning to host my application in a shared web hosting, which has these limitations (most likely similar to PHP + Comet (long-polling) scaling / hosts):
It does not seem I can change the web server. Most likely it's using Apache.
Supports MySQL 5, PHP 5.3.x, Perl, Python, Ruby on Rails, CGI
(To be more precise, I'll be using HawkHost's shared web hosting.)
And here are my result of research, followed by my questions:
Some resources (like Python Comet Server) say that PHP is not good for handling concurrent connections, while Python is better choice. Is this true?
I've tried the long polling technique in PHP (although I don't know whether it's correctly implemented or not, like Comet issue with abandoned open connections) using "Loop endlessly until the data changes." method. This almost works. The remaining problem is that the server process never dies when the browser is closed (the server does not know that the connection has been terminated, and the data never changes). Is there any way the PHP can detect whether the browser has been terminated so that it stops the loop?
I've been looking everywhere to look for answers but still I can't conclude anything. This topic has also been asked on StackOverflow so many times, I'm sorry if I may sound repeating >.<.
Currently I am able to code using PHP, MySQL, and JQuery for JS. I'm still new to the term Comet and Server Push. If necessary, I'm also willing to learn new scripting language like Python.
I appreciate any insights of what scripting language, framework, and techniques to use to start my project.
When you have a shared hosting environment and there are a number of restrictions enforced then it's a good idea to outsource the realtime functionality. I would say this since I work for one such company, Pusher. But I hope others will back me up on this.
When using a hosted solution you can push a notification by making a HTTP request to a RESTful API. The service will then deliver the message to the connected Web Client (browser). The browser does need to include a script tag or use a library that also connects to the hosted service.
The main benefits are:
No installation or maintenance
No need to handle persistent connections - no resource usage
Really simple usage: Script tag in app and call REST API
The hosted solution handles scaling
Also, here's a list of hosted realtime solutions.
So you can use Python. Then you can use Tornado. (psst... facebook uses it)
And I had same problem with open connections. Just don't spend time for search solution in PHP - later you will be sorry. I was. Just use what is made for Comet. If you more prefere JAVA, then there is: CometD.
And for game get a normal hosting. They cheap this days.
I am a newbie programmer and i dont yet have any idea of the WEB. I wish to start learning a technology that will allow me to build websites( database driven) i dont know which one to choose. I know some actionscript3 and flash.
Is it possible to create a database driven website using these alone? Or do i need to learn any other technology? If i do then what should i learn? I know j2se for the desktop and oracle SQL/MySQL
please show me a path. Also wanted to know if there is any technology like Wordpress for J2EE/flash
OK so i finally got the feeling that i need to learn PHP anyway along with css and javascript. So it is fine. Also another query. Which CMS should i consider? Wordpress or Joomla?
You can develop a database driven website using Flash, but only in the same sense that you can develop a database driven website using AJAX. That is, you can build the front-end using Flash/ActionScript but the back-end is built using other technologies. Just like working with JavaScript to develop a front-end, from ActionScript you would be communicating with Java or PHP or Python or something on the server using RESTful calls and then actually working with the database in the server-side scripts.
Honestly = this question is too broad and generic, and answers are easily found with some google searches.
That being said = of course you can build a data driven flash site. The one caveat here is that flash itself is fundamentally client-side technology, so we must rely on other remote tech to do the heavy data lifting. The options are profuse.
For example, a developer might create a front facing presentation in Flex, which is the streamlined, data-centric extension of pure flash. His database interactions are written in php, and these are constantly called upon to deliver content to the user.
So - what technologies to use? Whatever you know. And if you don't know, then learn the ones that are closest to what you know.
Finally, although I am a die-hard fan of flash, this type of project (you didn't specify what you had in mind) could be done with many different technologies. So - maybe flash is the right answer, but maybe javascript (ajax) could manage the same thing and do it without the need of plugins.
Yes you can develop database driven site in flash/action script but you still need and back-end technology i recommend you to check WebORB you can develop the back-end using Java, PHP, or .NET In addition you can use Flash Remoting technology Flash/Flex to communicate with a back-end
Flash can't be directly connected to database. You must use another technique which would be "mediator". I have developed Flash game with MySql database and PHP and I recommend you to use this combination. Here is visually presented this kind of communication: http://www.youtube.com/watch?v=gRi-oxjFfCU
yes, it is possible to crate database driven website with flash and action-script. You would get an XML file when you do action script in flash, so you can store nodes of that XML file into database(mysql). You can then create an Admin interface to manage your database contents, that would indirectly change your xml nodes. So basically you can edit the xml file and store it in the database.