Chart Js Getting Data From Database Using Mysql And Php

If you are looking for a way to create charts and graphs for your website or application, Chart Js is a popular and powerful JavaScript library that can help you do just that. One of the great things about Chart Js is that it can easily get data from a MySQL database using PHP.

What is Chart Js?

Chart Js is a JavaScript library that allows you to create beautiful and interactive charts and graphs for your website or application. It is open source and free to use, and it is widely used by developers all over the world.

Chart Js has a wide range of chart types, including line, bar, pie, radar, polar area, and more. It is highly customizable and flexible, allowing you to create charts that match the look and feel of your website or application.

How to Get Data from a MySQL Database Using PHP

Before we can use Chart Js to create charts from our MySQL database, we need to first retrieve the data from the database using PHP.

The first step is to establish a connection to the MySQL database using PHP. This can be done using the mysqli_connect() function:

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

In the above code, $servername, $username, $password, and $dbname are variables that contain the server name, username, password, and database name, respectively.

Once we have established a connection to the database, we can use the mysqli_query() function to execute a SQL query and retrieve the data:

$result = mysqli_query($conn, "SELECT * FROM table_name");

In the above code, "SELECT * FROM table_name" is an example of a SQL query that retrieves all the data from a table called "table_name".

We can then loop through the results and store the data in an array:

$data = array();while ($row = mysqli_fetch_assoc($result)) {$data[] = $row;}

In the above code, we use the mysqli_fetch_assoc() function to fetch each row of data from the result set, and we store it in the $data array.

How to Use Chart Js to Create Charts from MySQL Data

Now that we have retrieved the data from our MySQL database using PHP, we can use Chart Js to create charts from that data.

Related Chart

The first step is to include the Chart Js library in our HTML file:

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.4/Chart.min.js"></script>

In the above code, we use the <script> tag to include the Chart Js library from a CDN (Content Delivery Network).

We can then create a canvas element in our HTML file to hold the chart:

<canvas id="myChart"></canvas>

In the above code, we use the <canvas> tag to create a canvas element with an ID of "myChart". This is where our chart will be rendered.

We can then create a JavaScript file to create the chart using Chart Js:

var ctx = document.getElementById('myChart').getContext('2d');var chart = new Chart(ctx, {type: 'bar',data: {labels: ['Label 1', 'Label 2', 'Label 3'],datasets: [{label: 'Dataset 1',data: [10, 20, 30]}]}});

In the above code, we use the document.getElementById() function to get the canvas element with an ID of "myChart", and we create a new Chart object with a type of "bar". We then define the data for the chart, which includes an array of labels and an array of data values.

We can then replace the hard-coded data in the JavaScript file with the data we retrieved from our MySQL database using PHP:

var ctx = document.getElementById('myChart').getContext('2d');var chart = new Chart(ctx, {type: 'bar',data: {labels: ['',],datasets: [{label: 'Dataset 1',data: [,]}]}});

In the above code, we use a PHP foreach loop to loop through the $data array and output the labels and data values for the chart. We use PHP echo statements to output the data inside the JavaScript code.

Conclusion

Chart Js is a powerful JavaScript library that can help you create beautiful and interactive charts and graphs for your website or application. By retrieving data from a MySQL database using PHP, you can easily create charts that are dynamically updated based on the data in your database.