ENABLE User's Guide

USING AN ENABLE APPLICATION

READ NEXT (F5)

If you have established a position within a file by previously

requesting another read operation, you can retrieve the next

record (or records) in sequence by requesting a READ NEXT

operation. Suppose that you request a read by primary key where

the key value is 100. Your position within the file is at that

record. If you now request a READ NEXT operation, the

application will read the next record with a primary key value

greater than 100.

If you request an intervening insert, delete, or update

operation, you do not lose your position within the file. You

can continue the READ NEXT operation as if you had not requested

the intervening operation.

After you press a function key to request any read operation, the

application displays a message on the upper portion of the

screen. This message identifies the key which the application

will use if you request a READ NEXT operation.

READ NEXT Operation for an Outermost Box

If you have just performed a READ FIRST, by primary or alternate

key, you can read an entire file by requesting repeated READ NEXT

operations. To request a READ NEXT operation, press F5.

Refer to the various read functions listed in the table later in

this section to determine other uses of the READ NEXT operation.