weathermap

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[/] [lib/] [datasources/] [WeatherMapDataSource_dbsample.php] - Rev 126 Go to most recent revision
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<?php
// Sample Pluggable datasource for PHP Weathermap 0.9
// - read a pair of values from a database, and return it

// TARGET dbplug:databasename:username:pass:hostkey

class WeatherMapDataSource_dbsample extends WeatherMapDataSource {

        function Init(&$map)
        {
                if(! function_exists("mysql_real_escape_string") ) return FALSE;
                if(! function_exists("mysql_connect") ) return FALSE;
                
                return(TRUE);
        }
        
        function Recognise($targetstring)
        {
                if(preg_match("/^dbplug:([^:]+)$/",$targetstring,$matches))
                {
                        return TRUE;
                }
                else
                {
                        return FALSE;
                }
        }

        function ReadData($targetstring, &$map, &$item)
        {
                $data[IN] = NULL;
                $data[OUT] = NULL;
                $data_time = 0;
                
                if(preg_match("/^dbplug:([^:]+)$/",$targetstring,$matches))
                {
                        $database_user = $map->get_hint('dbplug_dbuser');
                        $database_pass = $map->get_hint('dbplug_dbpass');
                        $database_name = $map->get_hint('dbplug_dbname');
                        $database_host = $map->get_hint('dbplug_dbhost');
                                                
                        $key = mysql_real_escape_string($matches[1]);

                        $SQL = "select in,out from table where host=$key LIMIT 1";
                        if(mysql_connect($database_host,$database_user,$database_pass))
                        {
                                if(mysql_select_db($database_name))
                                {
                                        $result = mysql_query($SQL);
                                        if (!$result)
                                        {
                                            warn("dbsample ReadData: Invalid query: " . mysql_error()."\n");
                                        }
                                        else
                                        {
                                                $row = mysql_fetch_assoc($result);
                                                $data[IN] = $row['in'];
                                                $data[OUT] = $row['out'];
                                        }
                                }
                                else
                                {
                                        warn("dbsample ReadData: failed to select database: ".mysql_error()."\n");
                                }
                        }
                        else
                        {
                                warn("dbsample ReadData: failed to connect to database server: ".mysql_error()."\n");
                        }
                        
                        $data_time = now();
                }
                
                
                debug ("RRD ReadData: Returning (".($data[IN]===NULL?'NULL':$data[IN]).",".($data[OUT]===NULL?'NULL':$data[IN]).",$data_time)\n");
                
                return( array($data[IN], $data[OUT], $data_time) );
        }
}

// vim:ts=4:sw=4:
?>