ABAP Select data from SAP table OIAF8 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP OIAF8 table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to OIAF8. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the OIAF8 table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_OIAF8 TYPE STANDARD TABLE OF OIAF8,
      WA_OIAF8 TYPE OIAF8,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <OIAF8> TYPE OIAF8.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_OIAF8.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM OIAF8
  INTO TABLE IT_OIAF8.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIAF8
*  INTO TABLE @DATA(IT_OIAF82).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_OIAF8 INDEX 1 INTO DATA(WA_OIAF82).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_OIAF8 ASSIGNING <OIAF8>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OIAF8>-MANDT = 1.
<OIAF8>-KNUMV = 1.
<OIAF8>-KPOSN = 1.
<OIAF8>-STUNR = 1.
<OIAF8>-ZAEHK = 1.

ENDLOOP.

LOOP AT IT_OIAF8 INTO WA_OIAF8.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIAF8-FORTRMTYP, sy-vline,
  WA_OIAF8-PFIND, sy-vline,
  WA_OIAF8-REFDATE, sy-vline,
  WA_OIAF8-TIMUOM, sy-vline,
  WA_OIAF8-WERULE, sy-vline,
  WA_OIAF8-NPDAYS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIAF8 you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_OIAF8 TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_OIAF8 INTO WA_OIAF8.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_OIAF8_STR, 
MANDT TYPE STRING,
KNUMV TYPE STRING,
KPOSN TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
FORTRMTYP TYPE STRING,
PFIND TYPE STRING,
REFDATE TYPE STRING,
TIMUOM TYPE STRING,
WERULE TYPE STRING,
NPDAYS TYPE STRING,
ERRHAN TYPE STRING,
RDOFFSET TYPE STRING,
PERBEF TYPE STRING,
PERAFT TYPE STRING,
EXCEX TYPE STRING,
DATFRM TYPE STRING,
DATTO TYPE STRING,
CARULE TYPE STRING,
CDRULE TYPE STRING,
CREFDATE TYPE STRING,
CTIMUOM TYPE STRING,
CWERULE TYPE STRING,
CNPDAYS TYPE STRING,
CERRHAN TYPE STRING,
CRDOFFSET TYPE STRING,
CPERBEF TYPE STRING,
CPERAFT TYPE STRING,
CEXCEV TYPE STRING,
CDATFRM TYPE STRING,
CDATTO TYPE STRING,
TERMVAL TYPE STRING,
TERMCURR TYPE STRING,
DDATFRM TYPE STRING,
DDATTO TYPE STRING,
CDDATFRM TYPE STRING,
CDDDATTO TYPE STRING,
TSTAT TYPE STRING,
CALID TYPE STRING,
RNDTERM TYPE STRING,
RNDCURT TYPE STRING,
_DATAAGING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIAF8_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_OIAF8_STR-MANDT sy-vline 
WA_OIAF8_STR-KNUMV sy-vline 
WA_OIAF8_STR-KPOSN sy-vline 
WA_OIAF8_STR-STUNR sy-vline 
WA_OIAF8_STR-ZAEHK sy-vline 
WA_OIAF8_STR-FORTRMTYP sy-vline 
WA_OIAF8_STR-PFIND sy-vline 
WA_OIAF8_STR-REFDATE sy-vline 
WA_OIAF8_STR-TIMUOM sy-vline 
WA_OIAF8_STR-WERULE sy-vline 
WA_OIAF8_STR-NPDAYS sy-vline 
WA_OIAF8_STR-ERRHAN sy-vline 
WA_OIAF8_STR-RDOFFSET sy-vline 
WA_OIAF8_STR-PERBEF sy-vline 
WA_OIAF8_STR-PERAFT sy-vline 
WA_OIAF8_STR-EXCEX sy-vline 
WA_OIAF8_STR-DATFRM sy-vline 
WA_OIAF8_STR-DATTO sy-vline 
WA_OIAF8_STR-CARULE sy-vline 
WA_OIAF8_STR-CDRULE sy-vline 
WA_OIAF8_STR-CREFDATE sy-vline 
WA_OIAF8_STR-CTIMUOM sy-vline 
WA_OIAF8_STR-CWERULE sy-vline 
WA_OIAF8_STR-CNPDAYS sy-vline 
WA_OIAF8_STR-CERRHAN sy-vline 
WA_OIAF8_STR-CRDOFFSET sy-vline 
WA_OIAF8_STR-CPERBEF sy-vline 
WA_OIAF8_STR-CPERAFT sy-vline 
WA_OIAF8_STR-CEXCEV sy-vline 
WA_OIAF8_STR-CDATFRM sy-vline 
WA_OIAF8_STR-CDATTO sy-vline 
WA_OIAF8_STR-TERMVAL sy-vline 
WA_OIAF8_STR-TERMCURR sy-vline 
WA_OIAF8_STR-DDATFRM sy-vline 
WA_OIAF8_STR-DDATTO sy-vline 
WA_OIAF8_STR-CDDATFRM sy-vline 
WA_OIAF8_STR-CDDDATTO sy-vline 
WA_OIAF8_STR-TSTAT sy-vline 
WA_OIAF8_STR-CALID sy-vline 
WA_OIAF8_STR-RNDTERM sy-vline 
WA_OIAF8_STR-RNDCURT sy-vline 
WA_OIAF8_STR-_DATAAGING sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.