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Offline SQL sync

User avatar
Hardcore Programmer
Posts: 624

Offline SQL sync

Sun Aug 11, 2019 1:02 am

I have a client who has asked me to work on 2 seprate projects, one a website/app the other a desktop version of said app.
The website is php, html, jquery etc.... standard stuff.

What I was wondering is would it be possible to add offline syncing to that site and kill 2 birds with one stone.
I am not really sure how/where to start though.

I have a few basic ideas but nothing to run with yet.
1 - Maybe downloading the SQL DB as a SQLLite via a button that Syncs
2 - Maybe creating a cookie that holds all info as an array and syncing that every x minutes.

Neither of those seem to great of an idea (also dbs are not in need of security so to speak, their only info is fully displayed on site anyway)

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Site Admin
Posts: 4387

Re: Offline SQL sync

Tue Aug 13, 2019 7:14 pm

You could output the online DB to a JSON file via PHP and then have the desktop app read and display the JSON whoever you want.

Basic example of PHP script:

Code: Select all


$DBConnection = mysqli_connect($servername, $username, $password, $dbname);

$sql    = "SELECT * FROM tablename";
$result = mysqli_query($DBConnection, $sql);

if (mysqli_num_rows($result) > 0) {
    $rows = array();
    while ($row = mysqli_fetch_array($result)) {
        $rows[] = $row;

    echo json_encode($rows);


Comathi posted a good tutorial about reading JSON in vb.net:

You could then, with a little work, reverse it and use something like POST/GET to send and update the online data from the app.

Hope that helps.
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Coding Guru
Posts: 834

Re: Offline SQL sync

Fri Aug 16, 2019 1:04 pm

Cookies won't help you much considering they can store up to 4 MB of data. While HTML5 local storage gives more generous 10 MB of data storage, that can still be a limiting factor. The best idea, as suggested would be use JSON data exchange. I'd create a REST API services which could serve both website and desktop application. Desktop application could store data locally in file system to enable offline access.
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