2009/11/5 David Hine <David.Hine@xxxxxxxxxxxxxxxxxxx>:
> Dear All
> I wish to use java charts to display some time series data that is stored in
> a MySQL database. The time series is the evapotranspiration (average value
> for each day) at a large banana plantation. This will help guide irrigation.
>
> The java charts use an XML file for the data and the formatting.
>
> I have limited the records to 29 days:
> $query = "SELECT DATE_FORMAT(dt, '%d-%m-%Y') AS Day, AVG(ET) as ET FROM
> database.tablename WHERE DATE(dt) BETWEEN DATE_SUB(NOW(), INTERVAL 30 DAY)
> AND DATE(NOW()) GROUP BY DATE(dt)";
>
> I use a new DomDocument to format the output.
>
> Once I have the structure of the standard part of the document (calling the
> chart and giving some parameters to it) I want to have a series of strings
> like
> <number>1.7</number>
> <number>1.8</number>
> <number>2.1</number>
> etc for 29 times....
>
> For that purpose I wrote:
>
> $row = $doc->createElement( "row" );
> $chart_data->appendChild( $row );
>
> $number = $doc->createElement( "number" );
> while ($row_etdata = mysql_fetch_array($etdata)){
> $row->appendChild( $number );
> $txtnode = $doc->createTextNode("$ET");
> $number->appendChild($txtnode);
>
> When I run this or a variant, I get for example <number 1.71.71.71.71.7 for
> 29 times /> Half right is still wrong. Have considered serialize but that
> has its own complexities.
>
> Your assistance or guidance on solving this would be much appreciated.
> thanks
> David Hine
>
>
>
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>
Take a look at http://dev.mysql.com/tech-resources/articles/xml-in-mysql5.1-6.0.html#xml-5.1-exporting
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