Comment puis-je créer un graphique Google en utilisant PHP, MySQL et JSON ?

PHP MySQL Google Chart JSON - Exemple complet

À mesure que le paysage technologique évolue, la capacité de visualiser les données devient de plus en plus critique. Google Chart est un outil puissant pour la visualisation des données. Il permet aux développeurs de créer une variété de graphiques, notamment des diagrammes circulaires, des graphiques à barres et des graphiques linéaires. Cependant, l'intégration de Google Chart avec des sources de données MySQL peut poser des problèmes, en particulier lors de l'utilisation de PHP comme langage de programmation.

Cet article fournit une solution complète pour générer des Google Charts à l'aide de PHP et MySQL. Nous couvrirons plusieurs exemples illustrant l'utilisation de différentes méthodes d'accès aux données PHP :

Exemple 1 : PHP-MySQL-JSON-Google Chart (non-Ajax)

Utilisation :

1. Créez une base de données MySQL nommée "chart."
2. Créez un tableau nommé "googlechart" avec deux colonnes : "weekly_task" et "pourcentage".
3. Insérez des exemples de données dans le tableau, en vous assurant que la colonne "pourcentage" contient seulement numérique valeurs.

Code :

$con = mysql_connect("localhost", "Username", "Password") or die("Failed to connect with database!!!!");
mysql_select_db("Database Name", $con); 
// The Chart table contains two fields: weekly_task and percentage
// This example will display a pie chart. If you need other charts such as a Bar chart, you will need to modify the code a little to make it work with bar chart and other charts
$sth = mysql_query("SELECT * FROM chart");

/*
---------------------------
example data: Table (Chart)
--------------------------
weekly_task     percentage
Sleep           30
Watching Movie  40
work            44
*/

//flag is not needed
$flag = true;
$table = array();
$table['cols'] = array(

    // Labels for your chart, these represent the column titles
    // Note that one column is in "string" format and another one is in "number" format as pie chart only required "numbers" for calculating percentage and string will be used for column title
    array('label' => 'Weekly Task', 'type' => 'string'),
    array('label' => 'Percentage', 'type' => 'number')

);

$rows = array();
while($r = mysql_fetch_assoc($sth)) {
    $temp = array();
    // The following line will be used to slice the Pie chart
    $temp[] = array('v' => (string) $r['Weekly_task']); 

    // Values of each slice
    $temp[] = array('v' => (int) $r['percentage']); 
    $rows[] = array('c' => $temp);
}

$table['rows'] = $rows;
$jsonTable = json_encode($table);
//echo $jsonTable;
?>


  
  <!--Load the Ajax API-->
    <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">

    // Load the Visualization API and the piechart package.
    google.load('visualization', '1', {'packages':['corechart']});

    // Set a callback to run when the Google Visualization API is loaded.
    google.setOnLoadCallback(drawChart);

    function drawChart() {

      // Create our data table out of JSON data loaded from server.
      var data = new google.visualization.DataTable(<?=$jsonTable?>);
      var options = {
           title: 'My Weekly Plan',
          is3D: 'true',
          width: 800,
          height: 600
        };
      // Instantiate and draw our chart, passing in some options.
      // Do not forget to check your div ID
      var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
      chart.draw(data, options);
    }
    </script>
  

  
    <!--this is the div that will hold the pie chart-->
    <div>
<p><strong>Exemple 2 : PHP-PDO-JSON-MySQL-Google Chart</strong></p> <p>Cet exemple utilise PHP Data Objects (PDO) pour se connecter à la base de données, offrant une plus grande flexibilité et sécurité.</p>
<p><strong>Code :</strong></p>
<pre class="brush:php;toolbar:false">/*
... (code) ...
*/

try {
    /* Establish the database connection */
    $conn = new PDO("mysql:host=localhost;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    /* Select all the weekly tasks from the table googlechart */
    $result = $conn->query('SELECT * FROM googlechart');

    /*
        ---------------------------
        example data: Table (googlechart)
        --------------------------
        weekly_task     percentage
        Sleep           30
        Watching Movie  10
        job             40
        Exercise        20     


    */


    $rows = array();
    $table = array();
    $table['cols'] = array(

        // Labels for your chart, these represent the column titles.
        /* 
            Note that one column is in "string" format and another one is in "number" format 
            as pie chart only required "numbers" for calculating percentage 
            and string will be used for Slice title
        */

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

    );

    /* Extract the information from $result */
    foreach($result as $r) {

        $temp = array();

        // The following line will be used to slice the Pie chart

        $temp[] = array('v' => (string) $r['weekly_task']); 

        // Values of each slice

        $temp[] = array('v' => (int) $r['percentage']); 
        $rows[] = array('c' => $temp);
    }

    $table['rows'] = $rows;

    // convert data into JSON format
    $jsonTable = json_encode($table);
    //echo $jsonTable;
} catch(PDOException $e) {
    echo 'ERROR: ' . $e->getMessage();
}

?>

Exemple 3 : PHP-MySQLi-JSON-Google Chart

Cet exemple utilise MySQLi, une version améliorée de l'extension MySQL, pour l'interaction avec la base de données.

/*
... (code) ...
*/

/* Establish the database connection */
$mysqli = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);

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

/* Select all the weekly tasks from the table googlechart */
$result = $mysqli->query('SELECT * FROM googlechart');

/*
    ---------------------------
    example data: Table (googlechart)
    --------------------------
    Weekly_Task     percentage
    Sleep           30
    Watching Movie  10
    job             40
    Exercise        20     
*/


$rows = array();
$table = array();
$table['cols'] = array(

    // Labels for your chart, these represent the column titles.
    /* 
        Note that one column is in "string" format and another one is in "number" format 
        as pie chart only required "numbers" for calculating percentage 
        and string will be used for Slice title
    */

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

);

/* Extract the information from $result */
foreach($result as $r) {

    $temp = array();

    // The following line will be used to slice the Pie chart

    $temp[] = array('v' => (string) $r['weekly_task']); 

    // Values of the each slice

    $temp[] = array('v' => (int) $r['percentage']); 
    $rows[] = array('c' => $temp);
}

$table['rows'] = $rows;

// convert data into JSON format
$jsonTable = json_encode($table);
//echo $jsonTable;