$fk->register_insert( $value_for_column );
$fk->register_update( $new_value_for_column );
$fk->register_delete( $row_being_deleted );
DESCRIPTIONObjects in this class maintain referential integrity. This is really only useful when your RDBMS can't do this itself (like MySQL without InnoDB).
Note: all relevant documentation from the superclass has been merged into this document.
table_toReturns the relevant "Alzabo::Runtime::Table" object.
columns_toReturns the relevant "Alzabo::Runtime::Column" object(s) for the property as an array.
cardinalityReturns a two element array containing the two portions of the cardinality of the relationship. Each portion will be either '1' or 'n'.
to_is_dependentReturns a boolean value indicating whether there is a dependency from one table to the other.
is_many_to_oneReturns a boolean value indicating what kind of relationship the object represents.
is_same_relationship_as ($fk)Given a foreign key object, this returns true if the two objects represent the same relationship. However, the two objects may represent the same relationship from different table's points of view.
register_insert ($new_value)This method takes the proposed column value for a new row and makes sure that it is valid based on relationship that this object represents.
register_update ($new_value)This method takes the proposed new value for a column and makes sure that it is valid based on relationship that this object represents.
register_delete (Alzabo::Runtime::Row object)Allows the foreign key to delete rows dependent on the row being deleted. Note, this can lead to a chain reaction of cascading deletions. You have been warned.
idReturns a string uniquely identifying the foreign key.
commentReturns the comment associated with the foreign key object, if any.
AUTHORDave Rolsky, <[email protected]>