loop at ... -> M1

CLASS c1 DEFINITION.
  PUBLIC SECTION.
  METHODS M1 IMPORTING NAME TYPE S_CARRNAME
             RETURNING VALUE(CARR) TYPE S_CARR_ID.
ENDCLASS.

CLASS c1 IMPLEMENTATION.
  METHOD M1.
    SELECT CARRID UP TO 1 ROWS
      FROM SCARR
      INTO CARR
     WHERE CARRNAME = NAME.
    ENDSELECT.
  ENDMETHOD.
ENDCLASS.

DATA: JTAB TYPE STANDARD TABLE OF SPFLI,
      LINE TYPE SPFLI.

DATA: OREF TYPE REF TO C1.

START-OF-SELECTION.

  SELECT * FROM SPFLI INTO TABLE JTAB.

  CREATE OBJECT oref TYPE c1.

  LOOP AT JTAB INTO LINE
               WHERE CARRID = OREF-> M1( 'Lufthansa' ).
    WRITE: / LINE-CARRID, LINE-CONNID,
             LINE-CITYFROM, LINE-CITYTO.
  ENDLOOP.

The actual paraemters are passed to the IMPORTING parameters of the method as described under variants 2 and 3 of the CALL METHOD statement.

If the line type of the internal table contains object reference variables as components, or the entire line type is a reference variable, you can use the attributes of the object to which the reference in a line is pointing as the first field in a comparison.

loop 돌리면서 Parameter 를 이용해 call method 를 실행 할 수도 있다!