|Alzabo::Runtime::ForeignKey(3pm)||User Contributed Perl Documentation||Alzabo::Runtime::ForeignKey(3pm)|
NAME¶Alzabo::Runtime::ForeignKey - Foreign key objects
$fk->register_insert( $value_for_column ); $fk->register_update( $new_value_for_column ); $fk->register_delete( $row_being_deleted );
DESCRIPTION¶Objects in this class maintain referential integrity. This is really only useful when your RDBMS can't do this itself (like MySQL without InnoDB).
Note: all relevant documentation from the superclass has been merged into this document.
table_to¶Returns the relevant "Alzabo::Runtime::Table" object.
columns_to¶Returns the relevant "Alzabo::Runtime::Column" object(s) for the property as an array.
cardinality¶Returns a two element array containing the two portions of the cardinality of the relationship. Each portion will be either '1' or 'n'.
to_is_dependent¶Returns a boolean value indicating whether there is a dependency from one table to the other.
is_many_to_one¶Returns a boolean value indicating what kind of relationship the object represents.
is_same_relationship_as ($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.
id¶Returns a string uniquely identifying the foreign key.
comment¶Returns the comment associated with the foreign key object, if any.
AUTHOR¶Dave Rolsky, <firstname.lastname@example.org>