问题
What does Cascade in Nhibernate mean?
I see a lot of options in cascading:
- Delete
- All
- AllDeleteOrphan
- DeleteOrphan
- SaveUpdate
Can you explain these with with examples and their distinctions?
回答1:
It means apply the action to an item's related items.
Please see: NHibernate Cascades: the different between all, all-delete-orphans and save-update:
none - do not do any cascades, let users handle them by themselves.
save-update - when the object is saved/updated, check the associations and save/update any object that requires it (including save/update the associations in many-to-many scenario).
delete - when the object is deleted, delete all the objects in the association.
delete-orphan - when the object is deleted, delete all the objects in the association. In addition, when an object is removed from the association and not associated with another object (orphaned), also delete it.
all - when an object is save/update/delete, check the associations and save/update/delete all the objects found.
all-delete-orphan - when an object is save/update/delete, check the associations and save/update/delete all the objects found. In additional to that, when an object is removed from the association and not associated with another object (orphaned), also delete it.
来源：https://stackoverflow.com/questions/1994433/nhibernate-cascade