http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=5334 Summary: add explicit foreign key constraints Change sponsored?: --- Product: Koha Version: HEAD Platform: All OS/Version: All Status: NEW Severity: enhancement Priority: P5 Component: Database AssignedTo: gmcharlt@gmail.com ReportedBy: gmcharlt@gmail.com QAContact: koha-bugs@lists.koha-community.org Estimated Hours: 0.0 There are many tables that lack explicit foreign key relationships to parent tables. For example: * serial (biblionumber, subscriptionid) * subscription (biblionumber) * subscriptionhistory (biblionumber, subscriptionid) * suggestions (suggestedby, managedby, rejectedby) * branch_transfer_limits (toBranch, fromBranch) and many, many others. Explicit foreign keys should be added for several reasons: * to promote better data integrity and to expose cases where the application code makes unwarranted assumptions about the database structure * to allow cascading updates and deletes in some cases * to make it easier for external reporting tools to correctly identify relationships between tables * to make use of an ORM more effective There are some arguments against this: * a complete set of FKs may decrease database speed (on the other hand, the Koha schema already uses a bunch of FKs) There are some implementation details to consider: * the database creation scripts may need some reordering * in some cases, a database update to add an FK may require dealing with rows that do not meet the new constraint. -- Configure bugmail: http://bugs.koha-community.org/bugzilla3/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug.