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It is also possible to specify DRI actions on UPDATE and DELETE, such as CASCADE (forwards a change/delete in the referenced table to the referencing tables), NO ACTION (if the specific row is referenced, changing the key is not allowed) or SET NULL / SET DEFAULT (a changed/deleted key in the referenced table results in setting the referencing ...
A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign key attributes in one relation, R, must also exist in some other (not necessarily distinct) relation, S; furthermore that those ...
Cascading can be implemented in terms of chaining by having the methods return the target object (receiver, this, self).However, this requires that the method be implemented this way already – or the original object be wrapped in another object that does this – and that the method not return some other, potentially useful value (or nothing if that would be more appropriate, as in setters).
Do not delete or unprotect items because they are listed on this page! Don't do it, especially if a file has a backup copy on Commons. This page is meant to be an extra protection, to protect against silly mistakes, such as admins deleting or unprotecting high-risk templates and files. This cascade page is not meant to be the only protection ...
The problem with this scheme is that as the number of delete/insert operations increases, the cost of a successful search increases. To improve this, when an element is searched and found in the table, the element is relocated to the first location marked for deletion that was probed during the search.
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Requests to add or remove cascading protection on a page should be made at Wikipedia talk:Cascade-protected items as an edit request. Operational pages This includes configuration pages, data pages, log pages, status pages, and other pages specific to the operation of software.
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