HP 3000 Manuals

HP ALLBASE/4GL Developer Self-Paced Training Guide

Running the Module 

You can now test the order module by selecting the Test option from the
developer main menu.

When you select the Order Details option from the training application
main menu, the following screen is displayed:


          Order Maintenance Screen 

Using the Module 

The order maintenance module allows you to add new records, and delete or
modify existing records in the file.  Each action is performed when the
module is in the corresponding mode for the action.  The current module
mode is displayed in the label for the  Mode  function key, located in
the bottom left corner of the screen.

The mode indicates the type of change that will be made to the file when
you press the  Commit Data  function key.

HP ALLBASE/4GL automatically sets the mode based upon your previous
action.  If you enter an order number that does not currently exist, the
mode will change to Add.  If the order number does exist, the mode will
change to Modify.

You can then change the mode by pressing the  Mode  function key.

This module has three possible modes:  add, modify, and delete.
(Depending on the type of file, and whether the file records have a
unique primary key, some modules may not provide all three modes.)  When
you first enter the resultant screen, the mode is set to add.

Add some records, then try to modify or delete them.  The help screens
provided with the module may give you some assistance in using the
screen.

Test what happens when you enter an invalid product number.  (A valid
product number is defined as XY1000 to XY9999.)

Retrieving an Existing Record 

File scanning allows you to select the first, next, previous, or last
record from the file.  All scanning is controlled with four function
keys:    Previous Record ,  Next Record  in the main keys set, and  First 
Record , and  Last Record  which are displayed if you press the  More 
Keys  function keys.

Because the order record layout allows unique primary key values, you can
use keyed access to retrieve a specific record.  This is done by entering
a value in the key field and pressing Return.  HP ALLBASE/4GL attempts to
locate and display a record with a matching key value.  This is a full
key read of the main file, and is available whenever the cursor is in the
key field.

If a record is located, you can access records with key values adjacent
to that entered by pressing the  Previous Record  and  Next Record  
function keys.  You can then modify the retrieved record, or add a new
record if no record is found.

Once you have created a number of records, use the file scanning keys and
the keyed access method to display different records.

MPE/iX 5.0 Documentation