Closures adding constraints that, for some reason, could not be executed. If there's a slot with this attribute not-NIL in a class definition, then there's something wrong with its SQL counterpart.Accessors:delayed-constraint.
If non-NIL, a NON NULL database constrained will be introduced.Initargs::not-null; Accessors:not-null-p.
Action to be performed for this slot when the refering row in the database ceases to exist. Possible values: :CASCADE, :RESTRICT, :SET-NULL, :SET-DEFAULT. If this slot is not a foreign key, it does nothing.Initform:cascade, Initargs::on-delete; Accessors:on-delete.
If non-NIL, this slot should be treated as transient and ignored in all database related operations.Initargs::transient; Accessors:transient-p.
|add-constraint||Add a constraint to this slot's class' table.|