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Creation of Google Line Chart with data from MySQL

Posted on 2012-04-03
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Hi experts,

I hope someone can help me build a MySQL query. I want to extract data from the database of the number of table reservations  across all months in a specific year e.g. 2011.

All our table reservations from our nightclub is stored in a database table called reservations.

Then we have the following fields:

ID (int)
reservation_date (date)

I wonder if there is a smart way to count total reservations based on the ID and combine the date field with this graph from Google: https://google-developers.appspot.com/chart/interactive/docs/gallery/linechart

Thanks in advance!
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Question by:sittinDuck
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Ray Paseur earned 2000 total points
ID: 37808050
I can't test this (don't have your data base), but maybe this will give you an idea to get started.

The general strategy is to run one query for each month, and get the month and reservation counts in an associative array.  Then we can use the array to build the data.addRows information that we need to feed to Google.  HTH, ~Ray
<?php // RAY_temp_sittinDuck.php
error_reporting(E_ALL);

// CONSTRUCT THE QUERIES
$sqls['Jan'] = "SELECT id FROM reservations WHERE reservation_date BETWEEN '2011-01-01' AND '2011-01-31';
$sqls['Feb'] = "SELECT id FROM reservations WHERE reservation_date BETWEEN '2011-02-01' AND '2011-02-28';
$sqls['Mar'] = "SELECT id FROM reservations WHERE reservation_date BETWEEN '2011-03-01' AND '2011-03-31';
$sqls['Apr'] = "SELECT id FROM reservations WHERE reservation_date BETWEEN '2011-04-01' AND '2011-04-30';
// $sqls ETC ETC

// RUN THE QUERIES
$mons = array();
foreach ($sqls as $mon => $sql)
{
    $res = mysql_query($sql) or die( "FAIL: $sql<br/>" . mysql_error() );
    $mons[$mon] = mysql_num_rows($res);
}

// SET UP THE DATA BLOCK FOR THE CHARTS
$rows = NULL;
foreach ($mons as $mon => $num)
{
    $rows .= "['" . $mon . "'," . $num . "],";
}
$rows = rtrim($rows, ',');

// CREATE THE GOOGLE CHARTS DOCUMENT
$doc = <<<HEREDOC
<html>
  <head>
    <script type="text/javascript" src="https://www.google.com/jsapi"></script>
    <script type="text/javascript">
      google.load("visualization", "1", {packages:["corechart"]});
      google.setOnLoadCallback(drawChart);
      function drawChart() {
        var data = new google.visualization.DataTable();
        data.addColumn('string', 'Month');
        data.addColumn('number', 'Reservations');
        data.addRows([
        $rows
        ]);

        var options = {
          title: 'Company Performance'
        };

        var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
        chart.draw(data, options);
      }
    </script>
  </head>
  <body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>
HEREDOC;

echo $doc;

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