ENABLE Reference Manual

ENABLE FUNCTION KEYS
Single-File READ Operations
An ENABLE application identifies key fields by placing a special
symbol to the left of the label for the field. The application
uses an asterisk (*) to identify a primary key field and a plus
sign (+) to identify an alternate key field.
FILE OPERATIONS
The following paragraphs describe the operations that you can
perform on the data base files accessed by an ENABLE application.
These operations are:
READ
INSERT
DELETE
UPDATE
Since slight differences exist in the way that you perform
operations with applications that access a single data base file
and with applications that access several data base files, the
discussion describes operations for these types of applications
separately.
Single-File READ Operations
To indicate that the application is to perform a READ operation,
you position the cursor in a key field and press the appropriate
function key. If you do not position the cursor in a key field,
the application selects a default key field for the READ
operation. For some READ operations, you must enter a value in
the key field.
READ FIRST (F4)
A READ FIRST operation reads the first record (or records) in a
file. If you place the cursor in a primary key field, the
application reads the first record stored in the file. If you
place the cursor in an alternate key field, the application reads
the first record associated with the alternate key.
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