RE: [PHP] Access parent property from child

> -----Original Message----- > From: Suprie [mailto:suprie1983@gmail.com] > Sent: 09 August 2007 11:13 > To: php-general@lists.php.net > Subject: [PHP] Access parent property from child > > > dear all ... > > i have question, i've tried look at google but still can't figured out > how to do it... > i want access parent property from child object the code was like > > <? > > class DAO > { > private $db; > private $id; > > protected function getId() > { > return $this->id; > } > protected function setId($id) > { > $this->id = $id; > } > > function getDB() > { > return $this->$db; > } > function setDB($db) > { > $this->db = $db; > } > > public function load($id) > { > $query = "SELECT * FROM ". > constant(get_class($this)."::tableName"). > " WHERE ". > constant(get_class($this)."::pkFields"). > "='".$id."'"; > $rs = $this->db->Execute($query); > $cObj = $rs->FetchObject(true); > > return $cObj; > } > > public function save($rowData) > { > $this->db->debug = true; > $query ="Select * FROM > ".constant(get_class($this)."::tableName")."\n"; > $res =$this->db->Execute($query); > $insertSQL = $this->db->GetInsertSQL($res,$rowData); > $res =$this->db->Execute($insertSQL); > if($res) > return true; > > return false; > } > > public function update($row, $id) > { > $query = "SELECT * FROM > ".constant(get_class($this)."::tableName")."\n" > . "WHERE > > ".constant(get_class($this)."::pkFields")."='".$id."'"; > $res = $this->db->Execute($query); > $updateSQL = $this->db->GetUpdateSQL($res,$row); > $db->Execute($updateSQL); > } > > public function getAll($criteria='', $order='') > { > if(empty($order)) > $order = constant(get_class($this)."::pkFields"); > > $query = "SELECT * FROM > ".constant(get_class($this)."::tableName")."\n" > . $criteria > . "ORDER BY ".$order; > $row = $this->db->Execute($query); > if(!$row) > { > $this->error = $this->db->ErrorMsg(); > return false; > } > return $row->getArray(); > } > > } > > and i have this child > <?php > > include 'BaseDAO.class.php'; > class TaskCLDAO extends DAO > { > const tableName = 'task'; > const pkFields = 'task_id'; > > function findWithRelation($id) > { > $query = "select * from task LEFT JOIN log ON > task.id=log.task_id"; > $db = parent::getDB(); > $res = $db->Execute($query); > return $res->getArray(); > } > } > > > ?> > > and this is the class that called it > > <?php > > $obj = new TaskCLDAO(); > $obj->setDB($db); // i have another file called config that > initialized the db; > $res = $obj->findWithRelation(1); > > ?> > > but the php's said > > Fatal error: Cannot access empty property... > > what does it mean ?? is there another way to access "$db" that > parent have ? > > TIA In function getDb() return $this->$db; should be: return $this->db; Also, although not strictly required, I suggest you add the public keyword to your methods that don't specifiy their visibility. Edward