He buscado mucho para encontrar un buen ejemplo para generar un gráfico de Google utilizando los datos de la tabla MySQL como fuente de datos. Busqué un par de días y me di cuenta de que hay pocos ejemplos disponibles para generar un gráfico de Google (pastel, barra, columna, tabla) usando una combinación de PHP y MySQL. Finalmente logré que un ejemplo funcionara.
Anteriormente recibí mucha ayuda de StackOverflow, por lo que esta vez devolveré algo.
Tengo dos ejemplos; uno usa Ajax y el otro no. Hoy, solo mostraré el ejemplo que no es Ajax.
Uso:
    Requisitos: PHP, Apache y MySQL
    Instalación:
      --- Cree una base de datos utilizando phpMyAdmin y asígnele el nombre "chart"
      --- Crea una tabla usando phpMyAdmin y nómbrala "googlechart" y crea 
          La tabla segura tiene solo dos columnas, ya que he usado dos columnas. Sin embargo,
          puede usar más de 2 columnas si lo desea, pero debe cambiar el 
          codificar un poco para eso
      --- Especifique los nombres de columna de la siguiente manera: "semanalmente_tarea" y "porcentaje"
      --- Insertar algunos datos en la tabla
      --- Para la columna de porcentaje solo use un número
          ---------------------------------
          datos de ejemplo: Tabla (googlechart)
          ---------------------------------
          porcentaje de tareas semanales
          ----------- ----------
          Dormir 30
          Viendo la pelicula 10
          trabajo 40
          Ejercicio 20    
PHP-MySQL-JSON-Google Gráfico Ejemplo:
    <?php
$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 $jsonTable;
?>
<html>
  <head>
    <!--Load the Ajax API-->
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script type="text/javascript">
    // Load the Visualization API and the piechart package.
    google.load('visualization', '1', {'packages':['corechart']});
    // Set a callback to run when the Google Visualization API is loaded.
    google.setOnLoadCallback(drawChart);
    function drawChart() {
      // Create our data table out of JSON data loaded from server.
      var data = new google.visualization.DataTable(<?=$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>
  </head>
  <body>
    <!--this is the div that will hold the pie chart-->
    <div id="chart_div"></div>
  </body>
</html>
PHP-PDO-JSON-MySQL-Google Chart Ejemplo:
<?php
    /*
    Script  : PHP-PDO-JSON-mysql-googlechart
    Author  : Enam Hossain
    version : 1.0
    */
    /*
    --------------------------------------------------------------------
    Usage:
    --------------------------------------------------------------------
    Requirements: PHP, Apache and MySQL
    Installation:
      --- Create a database by using phpMyAdmin and name it "chart"
      --- Create a table by using phpMyAdmin and name it "googlechart" and make sure table has only two columns as I have used two columns. However, you can use more than 2 columns if you like but you have to change the code a little bit for that
      --- Specify column names as follows: "weekly_task" and "percentage"
      --- Insert some data into the table
      --- For the percentage column only use a number
          ---------------------------------
          example data: Table (googlechart)
          ---------------------------------
          weekly_task     percentage
          -----------     ----------
          Sleep           30
          Watching Movie  10
          job             40
          Exercise        20     
    */
    /* Your Database Name */
    $dbname = 'chart';
    /* Your Database User Name and Passowrd */
    $username = 'root';
    $password = '123456';
    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: ' . $e->getMessage();
    }
    ?>
    <html>
      <head>
        <!--Load the Ajax API-->
        <script type="text/javascript" src="https://www.google.com/jsapi"></script>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
        <script type="text/javascript">
        // Load the Visualization API and the piechart package.
        google.load('visualization', '1', {'packages':['corechart']});
        // Set a callback to run when the Google Visualization API is loaded.
        google.setOnLoadCallback(drawChart);
        function drawChart() {
          // Create our data table out of JSON data loaded from server.
          var data = new google.visualization.DataTable(<?=$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>
      </head>
      <body>
        <!--this is the div that will hold the pie chart-->
        <div id="chart_div"></div>
      </body>
    </html>
Ejemplo de gráfico PHP-MySQLi-JSON-Google
<?php
/*
Script  : PHP-JSON-MySQLi-GoogleChart
Author  : Enam Hossain
version : 1.0
*/
/*
--------------------------------------------------------------------
Usage:
--------------------------------------------------------------------
Requirements: PHP, Apache and MySQL
Installation:
  --- Create a database by using phpMyAdmin and name it "chart"
  --- Create a table by using phpMyAdmin and name it "googlechart" and make sure table has only two columns as I have used two columns. However, you can use more than 2 columns if you like but you have to change the code a little bit for that
  --- Specify column names as follows: "weekly_task" and "percentage"
  --- Insert some data into the table
  --- For the percentage column only use a number
      ---------------------------------
      example data: Table (googlechart)
      ---------------------------------
      weekly_task     percentage
      -----------     ----------
      Sleep           30
      Watching Movie  10
      job             40
      Exercise        20     
*/
/* Your Database Name */
$DB_NAME = 'chart';
/* Database Host */
$DB_HOST = 'localhost';
/* Your Database User Name and Passowrd */
$DB_USER = 'root';
$DB_PASS = '123456';
  /* 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 $jsonTable;
?>
<html>
  <head>
    <!--Load the Ajax API-->
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
    <script type="text/javascript">
    // Load the Visualization API and the piechart package.
    google.load('visualization', '1', {'packages':['corechart']});
    // Set a callback to run when the Google Visualization API is loaded.
    google.setOnLoadCallback(drawChart);
    function drawChart() {
      // Create our data table out of JSON data loaded from server.
      var data = new google.visualization.DataTable(<?=$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>
  </head>
  <body>
    <!--this is the div that will hold the pie chart-->
    <div id="chart_div"></div>
  </body>
</html>

mysql_*funciones en código nuevo . Ya no se mantienen y están oficialmente en desuso . ¿Ves el cuadro rojo ? Aprenda sobre las declaraciones preparadas y use PDO o MySQLi ; este artículo lo ayudará a decidir cuál. Si elige PDO, aquí hay un buen tutorial .Respuestas:
Algunos pueden encontrar este error localmente o en el servidor:
Esto significa que su entorno no admite etiquetas cortas, la solución es usar esto en su lugar:
¡Y todo debería funcionar bien!
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Puedes hacer esto de una manera más fácil. Y 100% trabaja que quieres
enlace loder.js aquí loder.js
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$query = "SELECT Date_time, Tempout FROM alarm_value"; // select columnestousa esto, realmente funciona:
data.addColumn no de su clave, puede agregar más columnas o eliminar
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Algunos pueden encontrar este error (lo obtuve al implementar el ejemplo de gráfico PHP-MySQLi-JSON-Google ):
La solución sería: reemplazar jsapi y simplemente usar loader.js con:
- de acuerdo con las notas de la versión -> La versión de Google Charts que permanece disponible a través del cargador jsapi ya no se actualiza constantemente. Utilice el nuevo cargador gstatic de ahora en adelante.
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