Horde_Db_Adapter::isActive PHP Method

    public function isActive();

 /**
  */
 public function write($id, $session_data)
 {
     if (!$this->_db->isActive()) {
         $this->_db->reconnect();
         $this->_db->beginDbTransaction();
     }
     /* Check if session exists. */
     try {
         $exists = $this->_db->selectValue(sprintf('SELECT 1 FROM %s WHERE session_id = ?', $this->_params['table']), array($id));
     } catch (Horde_Db_Exception $e) {
         return false;
     }
     /* Update or insert session data. */
     $session_data = new Horde_Db_Value_Binary($session_data);
     try {
         if ($exists) {
             $query = sprintf('UPDATE %s ' . 'SET session_data = ?, session_lastmodified = ? ' . 'WHERE session_id = ?', $this->_params['table']);
             $values = array($session_data, time(), $id);
             $this->_db->update($query, $values);
         } else {
             $query = sprintf('INSERT INTO %s ' . '(session_id, session_data, session_lastmodified) ' . 'VALUES (?, ?, ?)', $this->_params['table']);
             $values = array($id, $session_data, time());
             $this->_db->insert($query, $values);
         }
         $this->_db->commitDbTransaction();
     } catch (Horde_Db_Exception $e) {
         try {
             $this->_db->rollbackDbTransaction();
         } catch (Horde_Db_Exception $e) {
         }
         return false;
     }
     return true;
 }