How can I create Google Charts from MySQL data using PHP and JSON?-PHP Tutorial-php.cn

How can I create Google Charts from MySQL data using PHP and JSON?

Patricia Arquette

Release： 2024-11-23 09:45:44

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How can I create Google Charts from MySQL data using PHP and JSON?

Using PHP, MySQL, and JSON to Create Google Charts - A Comprehensive Guide

In this article, we'll explore a detailed guide on generating Google Charts using MySQL table data as the data source. We'll primarily focus on a non-Ajax example to simplify the understanding.

Requirements

Before we begin, ensure you have the following prerequisites:

PHP
Apache
MySQL

Database Setup

Create a database named "chart" using phpMyAdmin.
Create a table named "googlechart" with the following columns:
- weekly_task (string)
- percentage (number)

PHP Code

<?php
// Connect to the database
$con = mysql_connect("localhost", "username", "password");
mysql_select_db("chart", $con);

// Query the "googlechart" table
$sth = mysql_query("SELECT * FROM googlechart");

// Initialize the data table
$table = array();
$table['cols'] = array(

    // Column labels
    array('label' => 'Weekly Task', 'type' => 'string'),
    array('label' => 'Percentage', 'type' => 'number')

);

// Populate the table with data from the query result
$rows = array();
while ($r = mysql_fetch_assoc($sth)) {
    $temp = array();
    $temp[] = array('v' => $r['weekly_task']);
    $temp[] = array('v' => $r['percentage']);
    $rows[] = array('c' => $temp);
}

$table['rows'] = $rows;

// Convert the table data to JSON format
$jsonTable = json_encode($table);
?>

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HTML and JavaScript

<html>
  <head>
    <script src="https://www.google.com/jsapi"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script>
      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>
  </head>
  <body>
    <div>

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Potential Error

You may encounter an error while using short tags (

syntax error var data = new google.visualization.DataTable(<?php echo $jsonTable; ?>);

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To resolve this, use the following syntax instead:

<?php echo $jsonTable; ?>

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Now, you have a comprehensive understanding of how to use PHP, MySQL, and JSON to create Google Charts from your database data.

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