Sample ABAP program for Reading data from a file

REPORT CHAP2602.
* Data declarations for later use
TABLES CUSTOMERS.
PARAMETERS FILENAME(128) DEFAULT '/usr/tmp/testfile.dat'
LOWER CASE.
DATA: MSG_TEXT(50),
ALL_CUSTOMER_NAMES LIKE CUSTOMERS-NAME OCCURS 100
WITH HEADER LINE.


* Opening the File
OPEN DATASET FILENAME FOR INPUT IN TEXT MODE
MESSAGE MSG_TEXT.
IF SY-SUBRC NE 0.
WRITE: 'File cannot be opened. Reason:', MSG_TEXT.
EXIT.
ENDIF.
* Reading Data
DO.
READ DATASET FILENAME INTO ALL_CUSTOMER_NAMES.
IF SY-SUBRC NE 0.
EXIT.
ENDIF.
APPEND ALL_CUSTOMER_NAMES.
ENDDO.
* Closing the file
CLOSE DATASET FILENAME.
* Display the result
LOOP AT ALL_CUSTOMER_NAMES.
WRITE / ALL_CUSTOMER_NAMES.
ENDLOOP.