How to Create a Google Chart from MySQL Data Using PHP?

PHP MySQL Google Chart JSON - Complete Example

This question pertains to generating Google Charts using a combination of PHP and MySQL. The use of Ajax is not covered in this particular example.

Usage

Requirements

• PHP
• Apache
• MySQL

Installation

1. Create a database named "chart" using phpMyAdmin.
2. Create a table named "googlechart" with two columns: "weekly_task" and "percentage."
3. Insert sample data into the table, ensuring that the "percentage" column contains only numbers.

Code Examples

PHP-MySQL-JSON-Google Chart Example

<?php // Database connection
$con = mysql_connect("localhost", "Username", "Password");
mysql_select_db("Database Name", $con);

// Query
$sth = mysql_query("SELECT * FROM chart");

// Data preparation
$table['cols'] = array(
    array('label' => 'Weekly Task', 'type' => 'string'),
    array('label' => 'Percentage', 'type' => 'number')
);

$rows = array();
while ($r = mysql_fetch_assoc($sth)) {
    $temp = array();
    $temp[] = array('v' => (string)$r['Weekly_task']);
    $temp[] = array('v' => (int)$r['percentage']);
    $rows[] = array('c' => $temp);
}

$table['rows'] = $rows;
$jsonTable = json_encode($table);

// HTML
?>

  
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script type="text/javascript">
      google.load('visualization', '1', {'packages':['corechart']});
      google.setOnLoadCallback(drawChart);

      function drawChart() {
        var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);
        var options = {
            title: 'My Weekly Plan',
            is3D: 'true',
            width: 800,
            height: 600
        };
        var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  
  
    <div>
<p><strong>PHP-PDO-JSON-MySQL-Google Chart Example</strong></p>
<pre class="brush:php;toolbar:false"><?php // Database connection
$dbname = 'chart';
$username = 'root';
$password = '123456';

$conn = new PDO("mysql:host=localhost;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

// Query
$result = $conn->query('SELECT * FROM googlechart');

// Data preparation
$rows = array();
$table['cols'] = array(
    array('label' => 'Weekly Task', 'type' => 'string'),
    array('label' => 'Percentage', 'type' => 'number')
);

foreach ($result as $r) {
    $temp = array();
    $temp[] = array('v' => (string)$r['weekly_task']);
    $temp[] = array('v' => (int)$r['percentage']);
    $rows[] = array('c' => $temp);
}

$table['rows'] = $rows;
$jsonTable = json_encode($table);

// HTML
?>

  
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script type="text/javascript">
      google.load('visualization', '1', {'packages':['corechart']});
      google.setOnLoadCallback(drawChart);

      function drawChart() {
        var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);
        var options = {
            title: 'My Weekly Plan',
            is3D: 'true',
            width: 800,
            height: 600
        };
        var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  
  
    <div>
<p><strong>PHP-MySQLi-JSON-Google Chart Example</strong></p>
<pre class="brush:php;toolbar:false"><?php // Database connection
$DB_NAME = 'chart';
$DB_HOST = 'localhost';
$DB_USER = 'root';
$DB_PASS = '123456';

$mysqli = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);

if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

// Query
$result = $mysqli->query('SELECT * FROM googlechart');

// Data preparation
$rows = array();
$table['cols'] = array(
    array('label' => 'Weekly Task', 'type' => 'string'),
    array('label' => 'Percentage', 'type' => 'number')
);

foreach ($result as $r) {
    $temp = array();
    $temp[] = array('v' => (string)$r['weekly_task']);
    $temp[] = array('v' => (int)$r['percentage']);
    $rows[] = array('c' => $temp);
}

$table['rows'] = $rows;
$jsonTable = json_encode($table);

// HTML
?>

  
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script type="text/javascript">
      google.load('visualization', '1', {'packages':['corechart']});
      google.setOnLoadCallback(drawChart);

      function drawChart() {
        var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);
        var options = {
            title: 'My Weekly Plan',
            is3D: 'true',
            width: 800,
            height: 600
        };
        var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  
  
    <div>
<p><strong>Troubleshooting</strong></p>
<p>If you encounter the following error:</p>
<pre class="brush:php;toolbar:false">syntax error var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);

This indicates that your environment does not support short tags. To resolve this issue, use this code instead:

<?php echo $jsonTable; ?>