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<?php |
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/** |
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* DataObject is the base class for all the database access classes. Each |
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* "DataObject" holds one record from the database, and provides functions to |
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* allow loading from and saving to the database. |
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* |
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* Note: This requires the database tables to be named the same as the classes, |
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* and the database tables must have an "id" column. Simple views can be used |
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* as a way of aliasing to allow for a transition period. |
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* |
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* @author Simon Walker |
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*/ |
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abstract class DataObject |
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{ |
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/** |
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* @var int ID of the object |
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*/ |
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protected $id = 0; |
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/** |
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* @var bool |
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* TODO: we should probably make this a read-only method rather than public - why should anything external set this? |
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*/ |
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public $isNew = true; |
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/** |
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* @var PdoDatabase |
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*/ |
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protected $dbObject; |
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public function setDatabase(PdoDatabase $db) |
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{ |
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$this->dbObject = $db; |
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} |
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/** |
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* Gets the database associated with this data object. |
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* @return PdoDatabase |
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*/ |
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public function getDatabase() |
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{ |
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return $this->dbObject; |
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} |
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/** |
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* Retrieves a data object by it's row ID. |
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* @param int $id |
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* @param PdoDatabase $database |
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* @return DataObject|null |
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*/ |
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public static function getById($id, PdoDatabase $database) |
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{ |
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$statement = $database->prepare("SELECT * FROM `" . strtolower(get_called_class()) . "` WHERE id = :id LIMIT 1;"); |
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$statement->bindValue(":id", $id); |
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$statement->execute(); |
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$resultObject = $statement->fetchObject(get_called_class()); |
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if ($resultObject != false) { |
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$resultObject->isNew = false; |
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$resultObject->setDatabase($database); |
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} |
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return $resultObject; |
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} |
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/** |
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* Saves a data object to the database, either updating or inserting a record. |
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*/ |
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abstract public function save(); |
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/** |
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* Retrieves the ID attribute |
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*/ |
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public function getId() |
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{ |
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return $this->id; |
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} |
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/** |
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* Deletes the object from the database |
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*/ |
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public function delete() |
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{ |
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$statement = $this->dbObject->prepare( |
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"DELETE FROM `" |
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. strtolower(get_called_class()) |
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. "` WHERE id = :id;"); |
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$statement->bindValue(":id", $this->id); |
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$statement->execute(); |
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$this->id = 0; |
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$this->isNew = true; |
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} |
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public function getObjectDescription() |
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{ |
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return '[' . get_called_class() . " " . $this->getId() . ']'; |
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} |
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} |
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enwikipedia-acc /
waca
