January 2004
Intermediate to advanced
483 pages
13h 35m
English
Content preview from How to Build a Business Rules Engine
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347
At this point we have dealt with three fairly simple rule types that validate data entered
on screens. However, there are a number of other types of rules that are required to
fully validate screen data, and some of the most important concern referential
integrity. Referential integrity is an essential part of any application that works with
a database. Referential integrity represents an additional set of business rules that
ensure the following:
䊏
Primary key columns of a database table must contain nonnull values.
䊏
Duplicate records cannot exist in the same database table. A duplicate record is
one that has primary key values that are identical to those of some other record
in the database table.
䊏
If a database table is a child table of one or ...
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