i 'm new to as/400.in an interview i was asked this
question.give a practical example for passing information or
data through local data area.
I know only that data area is an object used to store tiny
bits of data or it can store one value at a time and it is
used to store frequently changing values or datas.thats all
i know about data area can any one tell me how local data
area and user defined data area are used to pass data
between jobs with a example or coding.thanks in advance.
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Answer Posted / prabhas
Data area is a storage area to store limited information.
Example: a new and unique customer number is generated
whenever a new customer is added to customer master file.
Data area keeps track of last record added and add 1 to it.
Through program we can access new customer number.
To create a data area, use the command CRTDTAARA (Create
Data Area). For example, to create a 100 character data
area named LASTINV#:
CRTDTAARA DTAARA(MYLIB/LASTINV#) TYPE(*CHAR) LEN(100)
Now, load the first 10 positions with the
value "AA12345678" with the CHGDTAARA (Change Data Area)
command
CHGDTAARA DTAARA(QTEMP/LASTINV# (1 10)) VALUE('AA12345678')
Look at the value of the data area with DSPDTAARA (Display
Data Area):
DSPDTAARA MYLIB/LASTINV#
A CL program can retrieve the value with RTVDTAARA. An RPG
program uses the "IN" operation to retrieve the value and
the "OUT" operation to change it.
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