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问题:

Hi i am trying to retrieve data from mysql database to create flot graph can anyone walk me through this procedure or give me an idea of what to do thanks

回答1:

You probably want something like this. I haven't used flot but I looked at the example here.

<?php
//create array of pairs of x and y values
$dataset1 = array();
while ($row = mysql_fetch_assoc()) { //or whatever
    $dataset1[] = array( $row['xvalue'], $row['yvalue'] );
}
?>

<script type="text/javascript">
    //put array into javascript variable
    var dataset1 = <?php echo json_encode($dataset1); ?>;

    //plot
    $(function () {
         $.plot($("#placeholder"), [ dataset1 ]);
    });
</script>

回答2:

Adding upon the example from @Tom Haigh:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Flot Examples</title>
    <link href="layout.css" rel="stylesheet" type="text/css">
    <!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../excanvas.min.js"></script><![endif]-->
    <script language="javascript" type="text/javascript" src="../jquery.js"></script>
    <script language="javascript" type="text/javascript" src="../jquery.flot.js"></script>
 </head>
    <body>
    <h1>Flot Examples</h1>

    <div id="placeholder" style="width:600px;height:300px;"></div>

<?php

$server = "localhost";
    $user="user";
    $password="password";  
    $database = "some_database";

    $connection = mysql_connect($server,$user,$password);
    $db = mysql_select_db($database,$connection);

query = "SELECT x_axis_values, y_axis_values FROM some_table";
    $result = mysql_query($query);        

    while($row = mysql_fetch_assoc($result))
    {
        $dataset1[] = array($row['x_axis_value'],$row['y_axis_value']);
    }

?>


<script type="text/javascript">
$(function () {
    var dataset1 = <?php echo json_encode($dataset1); ?>;

    $.plot($("#placeholder"), [ dataset1 ]);
});
</script>

 </body>
</html>

回答3:

as @Tom Haigh say work well, but you need to add another code to work well, I was using the example, but I discover in the source code it add to the result quotes " so to avoid this just add the: intval to the array, example:

<?php
$query = "SELECT valx, valy FROM chart";
    $result = mysql_query($query);        

    while($row = mysql_fetch_assoc($result))
    {
        $d2[] = array (intval($row['valx']),intval($row['valy']));
    }
?>

回答4:

This depends largely on your environment and requirements. There's lots of free tools out there you can use. One example is Flot that lets you use jQuery to build graphs. There's link to documentation on the Google Code page.