Load server database to webpage - javascript

currently I have my html5 webpage in a server I have. I have tested the connection and all works find. Now, I want to make a database that is stored in the server, let's say I have: (I'm learning web development )
dir/
index.html
my_db.sql
So the client will ask the server to make a query, delete data or insert data.
I'd like to use javascript for this. Dont know if it is possible. I have search but I only found information on how to make a local database in the client, have been ours looking for this without any result. Thanks

Related

How to get data from SQL server from web application

At my work, in another location, they have a server with data I want to query. I built a VB.net application and was able to put together a SQL query and return the info. But now I have built a website, html/css/js, and I can't figure out how to do the same thing.
I have read that firing the SQL query from javascript is not a good way to do it. Everything I am reading seems to point to using node.js.
But, I can't download and install node.js on work computers. And, I can't test at home, because the server is on an intranet that I can't access from home.
So, I am stuck. Can someone point me in the right direction.
To summarize: I want to send a request to the SQL Server and get back some data to display on this website.
Not actual vb.net code, but looks like this...
myConn = New SqlConnection("Initial Catalog=Northwind;" & _
"Data Source=localhost;Integrated Security=SSPI;")
Everything I found on the net that looked like this code, didn't work.

Editing local file after hitting button

I'm trying to make a comment section for a locally hosted site, basically I am trying to make it so when you hit the submit button, it checks for a existing file, if it exists, then it will edit it, and put the comment into it, if it doesn't exist, then it'll create the file, and save the data, I'm trying to save it as JSON if possible, any ideas?
The only things I can find are to let the visitor save to the computer, which isn't what I'm trying to do, I want the site to only be able to access it. And I'm trying to not set up a server if possible.
You will definitely need some kind of backend server to do that since JavaScript runs on the client side. I can only recommend taking a look at a NodeJS http server that changes the files according to GET or POST requests or using said GET and POST requests in combination with a server-side PHP script.

How can i connect JavaScript to a SQL server?

I work as an intern in a manufacturing company that designed a HTML web page run by JavaScript that is supposed to show real time statistics of the machine lines.
To do this it must connect to a SQL server in real time to obtain the data that it needs to display charts and reports.
I have good knowledge of other programming languages but I'm a rookie at JavaScript and I would like to know the safest way to do this, since the database contains sensitive data.
Can this be done?
You need some sort of middleman to connect to the database. Since you want to do this with JavaScript, I suggest you checkout NodeJS . You can then build a simple API that when consumed it will return the data required. One benefit of building an API is you will be able to consume it from the website that is already built without having to make any changes in the back end. You can simply use fetch the data from the front end using JavaScript.
Don't do this directly with Javascript in your HTML file in client-side(It is not secure).
Do this with any language that you know on the server side and read those data using ajax and display them in your HTML file.

How to integrate Node.js into a PHP Website?

Basically, I want to run my website with PHP using MySQL, and saving the data stored in an input / textarea on the database. This is pretty simple and I have no issues at doing so, but what I can't seem to figure out is how to integrate Node.js into this same website to take the user information previously entered and rendering it realtime. (Probably using Socket.io).
I believe this is a way to explain myself in a much simpler way:
Basic Website (HTML,CSS, JS) -> Processed and saved to Database with PHP -> Node.js takes this data and renders it to make realtime communication possible.

Using a server to send/receive information between a mobile phone and web page

I am trying to set up a simple set up as follows:
Have a mobile app with a page consisting of 4 lines (4 html paragraph lines (I am using phonegap)).
I want to use a web page from which I will input the data for those 4 lines. This information is sent to a server and that server transfers this information to that app on that mobile phone. Now, those 4 lines on the mobile phone is filled with the new information.
Similarly user inputs information on another page consisting of 10 lines of li (list). This information is again sent to the server and to the web page where the information is displayed.
I can almost feel the "internet police guys" getting all hyped and ready to vote this question down. But please understand that I have been on this site and various forums desperate to find a tutorial to guide me to do this and not able to find.
I am trying to use ajax to perform this setup. Confused how I would be using the php file. Information such as password n username is going to go in that php file to connect to the server. But php is a server side script thus needs to sit at the public_html folder. How do I use the php file from my desktop? Write a separate javascript to access it?
It is the concept that is confusing me. I am familiar with html,js,php.
I would appreciate any guidance or maybe a link to a tutorial which would help me to do the concept I mentioned. Thanks for listening.
You will need to create an API using PHP. This API is uploaded to your server and is considered "RESTful". Google a tutorial for what fits your needs. You can set all sorts of rules in this API such as requiring any requests to have an ID or access token.
Since you are using PhoneGap, your HTML and JS files rest on the device, so you will need to allow permissions to your API from anywhere. For this you will have to speak to your host provider about unless you know how to configure it yourself (some providers restrict what you want to do by default as an extra security precaution against XSS attacks).
Next, you can either use jQuery, or you can write some AJAX calls by writing the JavaScript yourself.
The most efficient way for this to work is to send JSON objects to and from the API. You will include a "command" in the JSON when you are sending from your app. On the PHP side, you will retrieve this command and use the rest of the data included in your JSON object to process the request. Your API will need to encode a JSON object for return (such as a user's profile information).
Here is a basic PHP API tutorial to get you going that explains some of the features of a RESTful API: PHP API
Here is a simple AJAX function (you will probably want to make this much more modular): AJAX
As broad as your question is, it seems like the best/easiest thing for you to do will be for you to first create a PHP webpage that will access a SQL database to perform the record updating. Actually, this should serve all of your needs for your mobile users assuming you don't need push notifications for live data updates.
I am assuming, since you are using phone gap, that you are more comfortable with web languages. After you get the webpage fully operational, then you should start building your app based on that exact same SQL database. With mobile app development there are a lot more "what if's" (what if the phone rings, what if the app is running in the background, what if there is no cellular service, etc...)
It is always easier to start with what you know and build on that, rather than starting with a new development platform and troubleshooting as problems arise.

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