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CHAPTER 15 TWELVE RULES FOR BUSINESS RULES
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Database and application rules might possibly also include stimulus/response rules i.e., rules of the form IF p THEN DO q, where p is a truth-valued expression and q is an action (of arbitrary complexity, in general; e.g., send an email message to the customer might be a valid action, in suitable circumstances). However, such rules at least partially violate Prescription 2, inasmuch as they are at least partially procedural, and they should be used sparingly and with caution. Note: Stimulus/response rules correspond to what are more frequently referred to as triggers. The idea is that the triggered action q is to be carried out whenever the triggering event p (meaning p is TRUE ) occurs. The keyword IF might more appropriately be spelled WHEN or ON in some situations. By the way, it is not necessary that rules be atomic in any sense, at least from the user s point of view. That is, if p and q are business rules, then (e.g.) p AND q is a business rule too. (Rule atomicity might be important from the point of view of the underlying theory or from the point of view of some implementation or both, but it should not be of much concern to the user.) Rules shall impose no artificial boundary between the database and main memory (i.e., the user shall not be required to be aware that the database and main memory constitute different levels of the storage hierarchy under the covers).
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Prescription 4: Declaration Sequence vs. Execution Sequence
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Business rules will depend on one another, in general, in a variety of different ways; for example, rule A might refer to a data item that is defined via rule B. This fact notwithstanding, it shall be possible to declare the rules in any physical sequence. (Equivalently, it shall be possible to change the sequence in which the rules are physically declared without affecting the meaning.) Determining the sequence in which the rules are to be executed ( fired ) shall be the responsibility of the rule engine solely. Observe that this prescription implies that inserting a new rule or updating or deleting an existing rule will require the rule engine to recompute the rule execution sequence, in general.
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Prescription 5: The Rule Engine Is a DBMS
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Database and application rules, at least (and to some extent presentation rules as well), are all expressed in terms of constructs in the database schema. Logically speaking, in fact, they are an integral part of that schema; indeed, it could be argued that the schema is the rules, nothing more and nothing less. It follows that the rule engine is just a special kind of database management system (DBMS), and rules per se are just a special kind of data (or metadata, rather). By virtue of Prescription 10, however, that DBMS can be thought of as operating at some kind of middleware level within the overall system; in other words, it is a DBMS that is at least capable of using other DBMSs and/or file systems to hold its stored data (thereby effectively running on top of those other DBMSs and/or file systems possibly several such at the same time). Note: As noted previously, this last point is further elaborated under Prescription 10.
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CHAPTER 15 TWELVE RULES FOR BUSINESS RULES
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As just stated, rules are data (database data, to be precise). It follows that the well-known external vs. conceptual vs. internal distinctions apply (thanks to Ron Ross for drawing my attention to this point). To be more specific: The external form of a given rule is the source form of that rule (i.e., the form in which it is originally stated to the rule engine by the rule definer). The conceptual form is a canonical representation of the rule, perhaps as one or more statements of pure predicate logic (a formalism that might not be suitable at the external level for ergonomic reasons). And the internal form is whatever form or forms, plural the rule engine finds it convenient to keep the rule in for storage and execution purposes. These three levels shall be rigidly distinguished and not confused with one another. The external and conceptual versions of any given rule shall include absolutely nothing that relates to, or is logically affected by, the internal (or physical or storage) level of the system. In particular, those versions shall include nothing that has to do with performance. Since (to say it again) rules are data, all of the services that are provided for database data in general including, e.g., conceptually centralized management, access optimization, physical and logical data independence, and recovery and concurrency controls shall be provided for rules in particular. In other words, standard DBMS benefits shall apply. Here are some specific implications of this point: Any given user shall need to be aware only of those rules that are pertinent to that user (just as any given user needs to be aware only of that portion of the data in a given database that is pertinent to that user). Rules shall be queryable and updatable (see Prescription 7). Rule consistency shall be maintained (again, see Prescription 7). Rules shall be sharable and reusable across applications (and vice versa see Prescription 9).
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