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Fetching data after a certain time interval(10 sec) from a continuously increasing database like mysql using flask


Fetching data after a certain time interval(10 sec) from a continuously increasing database like mysql using flask

By : Soylent
Date : November 29 2020, 12:01 PM
may help you . Say you currently have an API endpoint that returns all the database stored data:
code :
@app.route('/data', methods=['post'])
def data():
    all_the_data = Data.query.order_by(Data.created.desc()).all()
    return jsonify(results=all_the_data)
$.ajax({
    type: "POST",
    url: "/data",
    dataType: "json",
    success: function(data) { 
        console.log(data);
        update_graph(data);
    }
});
@app.route('/data', methods=['post'])
def data():
    client_data = request.json
    reference = client_data.get('reference')

    if reference:
        # we have a reference, so lets filter the query:
        query_data = Data.query.filter(Data.id>reference).order_by(Data.created.desc()).all()
    else:
        # no reference, so send the lot!
        query_data = Data.query.order_by(Data.created.desc()).all()

    return jsonify(results=query_data)
$.ajax({
    type: "POST",
    url: "/data",
    data: JSON.stringify({ reference: 999 }),
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function(data) {
       console.log(data)
       update_graph(data["results"]);
    }
});


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Fetching Data for Ruby's Rack App in specific time interval

Fetching Data for Ruby's Rack App in specific time interval


By : user2788845
Date : March 29 2020, 07:55 AM
should help you out Rufus Scheduler seems to do exactly what I wanted it's very neat and runs smoothly.
one thing I've had to do is run the app through Sinatra instead of pure rack since the raw Rack app wasn't refreshing the results accordingly on the /feed call, but with Sinatra is works pretty well.
Increasing value in database after time interval

Increasing value in database after time interval


By : na4aloS
Date : March 29 2020, 07:55 AM
Does that help Countr will be increased even every refresh too in this scenario, whatever you are saying for 30 sec interval ( you can use ajax request with a 30 sec timeout) but this seems like a buggy code what if some one closes it before 30 sec (browser) and you don't get any increment....
if you want to setup unique (views) use browser/ip/time based (for generic setup you can make it advance) and every time you get the request of counter addition check your db if you have same ip/browser and less duration as you say(30 sec or 1 min) then don't add other wise add 1 to script.
Continuously read data in real time with Flask + Python

Continuously read data in real time with Flask + Python


By : Bikash Sahoo
Date : March 29 2020, 07:55 AM
help you fix your problem I simply resolved adding in the HTML code of PHP page.
How to update data continuously in application without calling APIs after some interval of time?

How to update data continuously in application without calling APIs after some interval of time?


By : Pyppe
Date : March 29 2020, 07:55 AM
will be helpful for those in need These are the approaches in iOS to constantly update data coming from some server.
Polling Polling is term used to constantly request server using some POST or GET request after regular or irregular interval of time. Push-Notification Silent Push-Notification is an approach to update data whenever changes occurs. In this type server generates and request Apple to send a notification with some custom JSON. This is fast but Non-Guaranteed approach. Because Push can be miss some time or can be delay some time. Socket Socket is the most reliable and accurate solution for such issues in which an application needs to update their client-end whenever changes occurs on their back-end. Because it always keeps a live communication with server so you do-not need to request server every time.
After fetching data from MySQL database fetching column data from nth row and assigning to variable

After fetching data from MySQL database fetching column data from nth row and assigning to variable


By : user2710380
Date : March 29 2020, 07:55 AM
should help you out Fetch all (three) rows into an array (2-dimensional) with mysqli::fetch_all(). Then get the first and the last elements (rows) with reset() and end().
Change
code :
    while ($row2 = mysqli_fetch_assoc($result2)) {

        $test1 = $row2['login_attempt_time'][0];

        $test2 = $row2['login_attempt_time'][2];

        echo $test1.$test2;
        exit();
    }
    $data = $result2->fetch_all(MYSQLI_ASSOC);
    $variable1 = reset($data); // first row
    $variable2 = end($data);   // last row
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