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IFIP Advances in Information and Communication Technology
In an active database, an update may be constrained by integrity constraints, and may also trigger rules that, in turn, may a ect the database state. The general problem is to e ect the update while also managing the side-e ects" of constraint enforcement and rule execution. In this paper an update calculus is proposed by which updates, constraints and rules are speci ed and managed within the same formalism. Constraints and production rules are expressed in a constraint language based ondoi:10.1007/978-0-387-34913-8_12 fatcat:qrqroqirnnewjicpwdi7mss2h4