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Facilidade de uso
Overview of ENFORM
Introducing ENFORM
Introducing ENFORM
Formally, ENFORM is defined as a powerful nonprocedural language for querying or
developing reports on a relational database. This definition is complete and it does
describe ENFORM. But, what does it mean to you?
Language—Definition
First and most important, ENFORM is a language: a formal way of expressing your
information needs to the system by using ENFORM statements. The statements,
which resemble English, tell ENFORM what information you require and what you
want the information to look like. Viewed simply, using a language like ENFORM is
the first step in a sequence of events that transforms your ideas into actions that can be
performed by the computer.
Nonprocedural—Definition
Nonprocedural means that you tell ENFORM what you need, but not how to produce
it. ENFORM chooses a search strategy for accessing the database and producing the
required information. This frees you from the problem of deciding how to extract
information from a large complex database and allows you to concentrate on your
most important problem: deciding exactly what information is necessary to answer
your questions about the business.
Think of a nonprocedural language by comparing it to automated exposure on
modern cameras. The camera handles the details of exposure times and lens opening,
enabling you to think about, compose, and take the picture without secondary
distractions.
Queries and Reports—
This is a query—a question regarding information in the database:
Definition
OPEN parts;
LIST parts, the LIST statement
WHERE price LESS THAN 20000; produces a report
And this is a report—the answer to the question posed by the query:
PARTNUM PARTNAME INVENTORY LOCATION PRICE
4102 Disk 10 Mb 14 K87 8000.00
4103 Disk 50 Mb 9 K45 14500.00
The query is your question—phrased in a language that ENFORM can understand. It
is a specification of the exact information that should be selected from the database.
Simple queries can be entered by using a simple ENFORM statement. Complex
queries can be entered by adding more specifications to the statement, precisely
defining the information to be selected and its format.
Temporary queries can be entered to answer questions like “how many wrenches are
in stock?” And complex queries can be develop—using the editor—stored, and saved
to answer long term needs like weekly inventory reports or monthly budget reports.
The complex queries can be developed a piece at a time, tested, and saved for future
use by you or other users.
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058051 Tandem Computers Incorporated
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