/**
  * Performs the work of inserting or updating the row in the database.
  *
  * If the object is new, it inserts it; otherwise an update is performed.
  * All related objects are also updated in this method.
  *
  * @param      PropelPDO $con
  * @return int             The number of rows affected by this insert/update and any referring fk objects' save() operations.
  * @throws PropelException
  * @see        save()
  */
 protected function doSave(PropelPDO $con)
 {
     $affectedRows = 0;
     // initialize var to track total num of affected rows
     if (!$this->alreadyInSave) {
         $this->alreadyInSave = true;
         // We call the save method on the following object(s) if they
         // were passed to this object by their coresponding set
         // method.  This object relates to these object(s) by a
         // foreign key reference.
         if ($this->aSession !== null) {
             if ($this->aSession->isModified() || $this->aSession->isNew()) {
                 $affectedRows += $this->aSession->save($con);
             }
             $this->setSession($this->aSession);
         }
         if ($this->aUser !== null) {
             if ($this->aUser->isModified() || $this->aUser->isNew()) {
                 $affectedRows += $this->aUser->save($con);
             }
             $this->setUser($this->aUser);
         }
         if ($this->isNew() || $this->isModified()) {
             // persist changes
             if ($this->isNew()) {
                 $this->doInsert($con);
             } else {
                 $this->doUpdate($con);
             }
             $affectedRows += 1;
             $this->resetModified();
         }
         $this->alreadyInSave = false;
     }
     return $affectedRows;
 }