ABAP Select data from SAP table OIK29C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP OIK29C 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 OIK29C. 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 OIK29C 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_OIK29C TYPE STANDARD TABLE OF OIK29C,
      WA_OIK29C TYPE OIK29C,
      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: <OIK29C> TYPE OIK29C.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_OIK29C.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM OIK29C
  INTO TABLE IT_OIK29C.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OIK29C
*  INTO TABLE @DATA(IT_OIK29C2).
*--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_OIK29C INDEX 1 INTO DATA(WA_OIK29C2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_OIK29C ASSIGNING <OIK29C>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OIK29C>-MANDT = 1.
<OIK29C>-DOCNUM = 1.
<OIK29C>-INTNO = 1.
<OIK29C>-SEQNR = 1.
<OIK29C>-FUNCNAM = 1.

ENDLOOP.

LOOP AT IT_OIK29C INTO WA_OIK29C.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OIK29C-COUNTER, sy-vline,
  WA_OIK29C-XBLNR, sy-vline,
  WA_OIK29C-OIK_ACTFLG, sy-vline,
  WA_OIK29C-CD_STATUS, sy-vline,
  WA_OIK29C-MSGID, sy-vline,
  WA_OIK29C-MSGTY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OIK29C 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_OIK29C 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_OIK29C INTO WA_OIK29C.


*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 KDAUF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIK29C-KDAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIK29C-KDAUF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIEFN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIK29C-LIEFN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIK29C-LIEFN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SHNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_OIK29C-SHNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_OIK29C-SHNUM.
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_OIK29C_STR, 
MANDT TYPE STRING,
DOCNUM TYPE STRING,
INTNO TYPE STRING,
SEQNR TYPE STRING,
FUNCNAM TYPE STRING,
COUNTER TYPE STRING,
XBLNR TYPE STRING,
OIK_ACTFLG TYPE STRING,
CD_STATUS TYPE STRING,
MSGID TYPE STRING,
MSGTY TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
KDAUF TYPE STRING,
LIEFN TYPE STRING,
SHNUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OIK29C_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_OIK29C_STR-MANDT sy-vline 
WA_OIK29C_STR-DOCNUM sy-vline 
WA_OIK29C_STR-INTNO sy-vline 
WA_OIK29C_STR-SEQNR sy-vline 
WA_OIK29C_STR-FUNCNAM sy-vline 
WA_OIK29C_STR-COUNTER sy-vline 
WA_OIK29C_STR-XBLNR sy-vline 
WA_OIK29C_STR-OIK_ACTFLG sy-vline 
WA_OIK29C_STR-CD_STATUS sy-vline 
WA_OIK29C_STR-MSGID sy-vline 
WA_OIK29C_STR-MSGTY sy-vline 
WA_OIK29C_STR-MSGNO sy-vline 
WA_OIK29C_STR-MSGV1 sy-vline 
WA_OIK29C_STR-MSGV2 sy-vline 
WA_OIK29C_STR-MSGV3 sy-vline 
WA_OIK29C_STR-MSGV4 sy-vline 
WA_OIK29C_STR-KDAUF sy-vline 
WA_OIK29C_STR-LIEFN sy-vline 
WA_OIK29C_STR-SHNUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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