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using database data to draw charts

Viewing 6 posts - 1 through 6 (of 6 total)
  • September 19, 2018 at 7:15 pm #22672

    mikehellen

    hi, I want to draw a column chart representing the number of male and female registered by deriving that data from my database table, how should i go about it please?

    September 20, 2018 at 9:51 am #22675

    Priyanka M S

    @mikehellen,

    If you are integrating CanvasJS with PHP, please take a look at this example on rendering chart data from database.

    PHP Column Chart from Database

    If integrating with ASP.NET, please take a look at these step-by-step instructions in our documentation on adding data to chart from the database.

    Line Chart with Data-Points from DataBase in ASP.NET MVC

    __
    Priyanka M S
    Team CanvasJS

    September 21, 2018 at 12:41 pm #22697

    mikehellen

    @priyanka M S
    thanks for that but I am using mysqli , any mysqli exapmle please?

    September 25, 2018 at 11:00 am #22735

    Vishwas R

    @mikehellen,

    You can retrieve the data points from the database and pass it on chart options as shown in below code snippet.

    <?php
$dataPoints = array();

$con=mysqli_connect("localhost","root","","test"); //mysqli_connect("host","username","password","db"); - Refer https://www.w3schools.com/php/func_mysqli_connect.asp for more info

if (mysqli_connect_errno()) {
	echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT xval,yval FROM datapoints";

if ($result=mysqli_query($con,$sql)){	  
	foreach($result as $row){
		array_push($dataPoints, array("x"=> $row["xval"], "y"=> $row["yval"]));
	}
}

mysqli_close($con);
?>

<!DOCTYPE HTML>
<html>
<head>
<script>
window.onload = function () { 
	var chart = new CanvasJS.Chart("chartContainer", {
		animationEnabled: true,
		exportEnabled: true,
		theme: "light1", // "light1", "light2", "dark1", "dark2"
        exportEnabled: true,
		title:{
			text: "PHP Column Chart from Database - MySQLi"
		},
		data: [{
			type: "column", //change type to bar, line, area, pie, etc  
			dataPoints: <?php echo json_encode($dataPoints, JSON_NUMERIC_CHECK); ?>
		}]
	});
	chart.render(); 
}
</script>
</head>
<body>
	<div id="chartContainer" style="height: 360px; width: 50%; margin: auto;"></div>
	<script src="https://cdn.canvasjs.com/canvasjs.min.js"></script>
</body>
</html>

    Please take a look at this Sample Project for complete working sample.

    PHP Column Chart from Database - MySQLi

    —
    Vishwas R
    Team CanvasJS

    December 22, 2022 at 9:33 pm #41745

    RubiconX

    This mysqli example is exactly what I am looking for! Thanks.

    To expand on it a little bit, what if I had 2 (or more) datasets that I wanted on a line graph? Im having some difficulty determining how to format the data from the database and send to canvasjs. Do I just add a label and include ALL the datapoints in an array and canvasjs is smart enough to know the different labels are different lines?

    December 23, 2022 at 6:16 pm #41756

    Vishwas R

    @rubiconx,

    Pushing datapoint values to different arrays & passing them in multi-series chart options should work fine in this case. Please find the code snippet below.

    
<?php
$dataPoints1 = array();
$dataPoints2 = array();

$con=mysqli_connect("localhost","root","","test"); //mysqli_connect("host","username","password","db"); - Refer https://www.w3schools.com/php/func_mysqli_connect.asp for more info

if (mysqli_connect_errno()) {
	echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT xval,yval1, yval2 FROM datapoints";

if ($result=mysqli_query($con,$sql)){	  
	foreach($result as $row){
		array_push($dataPoints1, array("x"=> $row["xval"], "y"=> $row["yval1"]));
		array_push($dataPoints2, array("x"=> $row["xval"], "y"=> $row["yval2"]));}
}

mysqli_close($con);
?>

<!DOCTYPE HTML>
<html>
<head>
<script>
window.onload = function () { 
	var chart = new CanvasJS.Chart("chartContainer", {
		animationEnabled: true,
		exportEnabled: true,
		theme: "light1", // "light1", "light2", "dark1", "dark2"
        exportEnabled: true,
		title:{
			text: "PHP Column Chart from Database - MySQLi"
		},
		data: [{
			type: "column", //change type to bar, line, area, pie, etc  
			dataPoints: <?php echo json_encode($dataPoints1, JSON_NUMERIC_CHECK); ?>
		}, {
			type: "column", //change type to bar, line, area, pie, etc  
			dataPoints: <?php echo json_encode($dataPoints2, JSON_NUMERIC_CHECK); ?>
		}]
	});
	chart.render(); 
}
</script>
</head>
<body>
	<div id="chartContainer" style="height: 360px; width: 50%; margin: auto;"></div>
	<script src="https://cdn.canvasjs.com/canvasjs.min.js"></script>
</body>
</html>

    —
    Vishwas R
    Team CanvasJS

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