HP 3000 Manuals HP 3000 Manuals
Summary
In this lesson you created a number of logic blocks for the application.
Some of these logic blocks introduced logic commands that you haven't
used before. The commands are:
* The TRANSACT command.
This command allows you to define groups of file transactions that
must be performed together to ensure logical consistency of the
files. The command exists in three forms. The *BEGIN and *END
forms of the command mark the start and finish of the group of
file commands. The *UNDO form of the command reverses all KSAM
and HP ALLBASE/SQL file transactions that have occurred since the
last TRANSACT *BEGIN command.
* The LINK command (not used in this HP ALLBASE/SQL application).
The LINK command concatenates a number of fields, and places the
result in a specified field. The LINK command optionally allows
you to specify a "joiner" that is inserted between the fields as
they are linked.
In this application, you used the LINK command to concatenate the
product number and the option number to create a unique option_key
to read the option file.
The HP ALLBASE/4GL Developer Reference Manual describes these logic
commands in more detail.