Problem extending mysqli - "No database connected"

Hi, I have a class that extends msyqli that AFAIK can connect to the database, but gives me an error when I try and query it. Here's my class: -- BEGIN DATABASE CLASS -- require_once('Configuration.php'); require_once('RSFSException.php'); class Database extends mysqli { private $strUrl = "DEV"; private $strUser; private $strPass; private $strHost; private $intPort; private $strName; private static $INSTANCE; private static $CONFIG; private function __construct() { $this->CONFIG = Configuration::getInstance(); $this->establishConnectionSettings(); $this->connect($this->getHost(), $this->getUser(), $this->getPass(), $this->getName); if (mysqli_connect_errno()) {

           		throw new RSFSException("Connect exception:\n ".
           		mysqli_connect_error(), -1);
       	}

} public static function getInstance($url = null) { // Set the URL if one is provided. if (isset($url)) { $this->setUrl($url); } // Instantiate the Singleton if not already instantiated. if(empty(self::$INSTANCE)) { self::$INSTANCE = new Database(); } return self::$INSTANCE; } public function establishConnectionSettings() { // DEVELOPMENT (default) database settings. if ($this->getUrl() == "DEV") { $this->setUser($this->CONFIG->getProperty("rsfsTestDbUser")); $this->setPass($this->CONFIG->getProperty("rsfsTestDbPass")); $this->setHost($this->CONFIG->getProperty("rsfsTestDbHost")); $this->setPort($this->CONFIG->getProperty("rsfsTestDbPort")); $this->setName($this->CONFIG->getProperty("rsfsTestDbName")); } // PRODUCTION database settings. else if ($this->getUrl() == "PROD") { $this->setUser($this->CONFIG->getProperty("rsfsDbUser")); $this->setPass($this->CONFIG->getProperty("rsfsDbPass")); $this->setHost($this->CONFIG->getProperty("rsfsDbHost")); $this->setPort($this->CONFIG->getProperty("rsfsDbPort")); $this->setName($this->CONFIG->getProperty("rsfsDbName")); } else { // Throw an exception. } } public function query($sql) { $result = parent::query($sql); if(mysqli_error($this)){

     		throw new RSFSException(mysqli_error($this), mysqli_errno($this));

} return $result; } public function valueExists($table, $column, $value, $caseInsensitive = false) { if (!$caseInsensitive) { $sql = "SELECT * FROM $table WHERE $column = $value"; } else { $sql = "SELECT * FROM $table " . "WHERE upper($column) = ($value)"; } $result = $this->query($sql); echo "Result: $result\n"; $count = $result->num_rows; if ($count > 0) { return true; } else { return false; } } public function valuesExist($table, $columns, $values) { // Placeholder. } public function procedureQuery($name, $params) { return $this->query("call $name($params)"); } /** Return the URL. */ public function getUrl() { return $this->strUrl; } . . . /** Set the database URL. */ public function setName($url) { $this->strUrl = $$url; } } -- END DATABASE CLASS -- To test it, I'm doing the following: -- BEGIN -- echo "Attempting to establish connection.\n"; $CONN = Database::getInstance(); if ($CONN->ping()) { printf ("Our connection is ok!\n"); } else { printf ("Danger, Will Robinson!!!\n"); } echo "Attempting to test query() method.\n"; if ($result = $CONN->query("SELECT * FROM country")) { echo "In result set\n"; while( $row = mysqli_fetch_assoc($result) ){ printf("%s (%s)\n", $row['cnt_code'], $row['cnt_name']); } } -- END -- Which outputs the following: Attempting to establish connection. localhost:rsfs:rsfs:rsfs Our connection is ok! Attempting to test query() method. Fatal error: Uncaught RSFSException: [1046]: No database selected thrown in /home/lee/Development/rsfs/php/classes/core/Database.php on line 84 I've tried removing the query method from my class, but even Mysqli's query() isn't working. Can anyone help me identify the problem? Thanks! Lee PS: I posted a similar question a few weeks ago - I though I had it working when I saw that it was connecting. Now that I'm ready to actually use it, I see that it just can't query...