ABAP Select data from SAP table OIK02A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP OIK02A 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 OIK02A. 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 OIK02A 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_OIK02A TYPE STANDARD TABLE OF OIK02A,
      WA_OIK02A TYPE OIK02A,
      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: <OIK02A> TYPE OIK02A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_OIK02A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM OIK02A
  INTO TABLE IT_OIK02A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIK02A
*  INTO TABLE @DATA(IT_OIK02A2).
*--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_OIK02A INDEX 1 INTO DATA(WA_OIK02A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_OIK02A ASSIGNING <OIK02A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OIK02A>-MANDT = 1.
<OIK02A>-DOCNUM = 1.
<OIK02A>-INTNO = 1.
<OIK02A>-SEQNR = 1.
<OIK02A>-FGROUP = 1.

ENDLOOP.

LOOP AT IT_OIK02A INTO WA_OIK02A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIK02A-SEGNUM, sy-vline,
  WA_OIK02A-LIDNO, sy-vline,
  WA_OIK02A-LIDADDON, sy-vline,
  WA_OIK02A-LOADDATE, sy-vline,
  WA_OIK02A-LOADTIME, sy-vline,
  WA_OIK02A-DOCTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIK02A 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_OIK02A 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_OIK02A INTO WA_OIK02A.


*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.

*Conversion exit ALPHA, internal->external for field LIDNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIK02A-LIDNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIK02A-LIDNO.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_OIK02A_STR, 
MANDT TYPE STRING,
DOCNUM TYPE STRING,
INTNO TYPE STRING,
SEQNR TYPE STRING,
FGROUP TYPE STRING,
SEGNUM TYPE STRING,
LIDNO TYPE STRING,
LIDADDON TYPE STRING,
LOADDATE TYPE STRING,
LOADTIME TYPE STRING,
DOCTYPE TYPE STRING,
DOCNO TYPE STRING,
ITEMNO TYPE STRING,
ERDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIK02A_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_OIK02A_STR-MANDT sy-vline 
WA_OIK02A_STR-DOCNUM sy-vline 
WA_OIK02A_STR-INTNO sy-vline 
WA_OIK02A_STR-SEQNR sy-vline 
WA_OIK02A_STR-FGROUP sy-vline 
WA_OIK02A_STR-SEGNUM sy-vline 
WA_OIK02A_STR-LIDNO sy-vline 
WA_OIK02A_STR-LIDADDON sy-vline 
WA_OIK02A_STR-LOADDATE sy-vline 
WA_OIK02A_STR-LOADTIME sy-vline 
WA_OIK02A_STR-DOCTYPE sy-vline 
WA_OIK02A_STR-DOCNO sy-vline 
WA_OIK02A_STR-ITEMNO sy-vline 
WA_OIK02A_STR-ERDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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