ABAP Select data from SAP table VIWI01 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VIWI01 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 VIWI01. 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 VIWI01 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_VIWI01 TYPE STANDARD TABLE OF VIWI01,
      WA_VIWI01 TYPE VIWI01,
      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: <VIWI01> TYPE VIWI01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VIWI01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VIWI01
  INTO TABLE IT_VIWI01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VIWI01
*  INTO TABLE @DATA(IT_VIWI012).
*--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_VIWI01 INDEX 1 INTO DATA(WA_VIWI012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VIWI01 ASSIGNING <VIWI01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VIWI01>-MANDT = 1.
<VIWI01>-BUKRS = 1.
<VIWI01>-SWENR = 1.
<VIWI01>-DATUM = 1.
<VIWI01>-GRUND_GES = 1.

ENDLOOP.

LOOP AT IT_VIWI01 INTO WA_VIWI01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VIWI01-GRUND_OW, sy-vline,
  WA_VIWI01-GRUND_SW, sy-vline,
  WA_VIWI01-GRUND_SR, sy-vline,
  WA_VIWI01-ERWERB_GES, sy-vline,
  WA_VIWI01-ERWERB_OW, sy-vline,
  WA_VIWI01-ERWERB_SW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VIWI01 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_VIWI01 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_VIWI01 INTO WA_VIWI01.


*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 SWENR, internal->external for field SWENR
CALL FUNCTION 'CONVERSION_EXIT_SWENR_OUTPUT'
  EXPORTING
    input =                      WA_VIWI01-SWENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VIWI01-SWENR.
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_VIWI01_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
SWENR TYPE STRING,
DATUM TYPE STRING,
GRUND_GES TYPE STRING,
GRUND_OW TYPE STRING,
GRUND_SW TYPE STRING,
GRUND_SR TYPE STRING,
ERWERB_GES TYPE STRING,
ERWERB_OW TYPE STRING,
ERWERB_SW TYPE STRING,
ERWERB_SR TYPE STRING,
ERSCHL_GES TYPE STRING,
ERSCHL_OW TYPE STRING,
ERSCHL_SW TYPE STRING,
ERSCHL_SR TYPE STRING,
SUM1_GES TYPE STRING,
SUM1_OW TYPE STRING,
SUM1_SW TYPE STRING,
SUM1_SR TYPE STRING,
BAUKOT_GES TYPE STRING,
BAUKOT_OW TYPE STRING,
BAUKOT_SW TYPE STRING,
BAUKOT_SR TYPE STRING,
BAUKOG_GES TYPE STRING,
BAUKOG_OW TYPE STRING,
BAUKOG_SW TYPE STRING,
BAUKOG_SR TYPE STRING,
BAUKOA_GES TYPE STRING,
BAUKOA_OW TYPE STRING,
BAUKOA_SW TYPE STRING,
BAUKOA_SR TYPE STRING,
BAUKOB_GES TYPE STRING,
BAUKOB_OW TYPE STRING,
BAUKOB_SW TYPE STRING,
BAUKOB_SR TYPE STRING,
GERAET_GES TYPE STRING,
GERAET_OW TYPE STRING,
GERAET_SW TYPE STRING,
GERAET_SR TYPE STRING,
AUSSEN_GES TYPE STRING,
AUSSEN_OW TYPE STRING,
AUSSEN_SW TYPE STRING,
AUSSEN_SR TYPE STRING,
ZUSATZ_GES TYPE STRING,
ZUSATZ_OW TYPE STRING,
ZUSATZ_SW TYPE STRING,
ZUSATZ_SR TYPE STRING,
NEBENA_GES TYPE STRING,
NEBENA_OW TYPE STRING,
NEBENA_SW TYPE STRING,
NEBENA_SR TYPE STRING,
NEBENV_GES TYPE STRING,
NEBENV_OW TYPE STRING,
NEBENV_SW TYPE STRING,
NEBENV_SR TYPE STRING,
NEBENB_GES TYPE STRING,
NEBENB_OW TYPE STRING,
NEBENB_SW TYPE STRING,
NEBENB_SR TYPE STRING,
NEBENK_GES TYPE STRING,
NEBENK_OW TYPE STRING,
NEBENK_SW TYPE STRING,
NEBENK_SR TYPE STRING,
NEBENF_GES TYPE STRING,
NEBENF_OW TYPE STRING,
NEBENF_SW TYPE STRING,
NEBENF_SR TYPE STRING,
NEBENS_GES TYPE STRING,
NEBENS_OW TYPE STRING,
NEBENS_SW TYPE STRING,
NEBENS_SR TYPE STRING,
SUM2_GES TYPE STRING,
SUM2_OW TYPE STRING,
SUM2_SW TYPE STRING,
SUM2_SR TYPE STRING,
PARKPL_GES TYPE STRING,
PARKPL_OW TYPE STRING,
PARKPL_SW TYPE STRING,
PARKPL_SR TYPE STRING,
SUM3_GES TYPE STRING,
SUM3_OW TYPE STRING,
SUM3_SW TYPE STRING,
SUM3_SR TYPE STRING,
GESSUM_GES TYPE STRING,
GESSUM_OW TYPE STRING,
GESSUM_SW TYPE STRING,
GESSUM_SR TYPE STRING,
BAU_KAUF TYPE STRING,
BAU_VERKW TYPE STRING,
BAU_FLAE TYPE STRING,
BAU_KSUM TYPE STRING,
BAU_VSUM TYPE STRING,
BAU_ERW TYPE STRING,
BAU_FREI TYPE STRING,
BAU_BAUPL TYPE STRING,
ERS_OEFF TYPE STRING,
ERS_NOEFF TYPE STRING,
ERS_AND TYPE STRING,
KOS_M3 TYPE STRING,
KOS_BETM3 TYPE STRING,
PARK_ANZ TYPE STRING,
PARK_BETR TYPE STRING,
AANL_EINF TYPE STRING,
AANL_GELA TYPE STRING,
AANL_VERS TYPE STRING,
AANL_WIRT TYPE STRING,
AANL_KUNS TYPE STRING,
AANL_SOND TYPE STRING,
AANL_VERK TYPE STRING,
AANL_GRUE TYPE STRING,
AANL_SONS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VIWI01_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_VIWI01_STR-MANDT sy-vline 
WA_VIWI01_STR-BUKRS sy-vline 
WA_VIWI01_STR-SWENR sy-vline 
WA_VIWI01_STR-DATUM sy-vline 
WA_VIWI01_STR-GRUND_GES sy-vline 
WA_VIWI01_STR-GRUND_OW sy-vline 
WA_VIWI01_STR-GRUND_SW sy-vline 
WA_VIWI01_STR-GRUND_SR sy-vline 
WA_VIWI01_STR-ERWERB_GES sy-vline 
WA_VIWI01_STR-ERWERB_OW sy-vline 
WA_VIWI01_STR-ERWERB_SW sy-vline 
WA_VIWI01_STR-ERWERB_SR sy-vline 
WA_VIWI01_STR-ERSCHL_GES sy-vline 
WA_VIWI01_STR-ERSCHL_OW sy-vline 
WA_VIWI01_STR-ERSCHL_SW sy-vline 
WA_VIWI01_STR-ERSCHL_SR sy-vline 
WA_VIWI01_STR-SUM1_GES sy-vline 
WA_VIWI01_STR-SUM1_OW sy-vline 
WA_VIWI01_STR-SUM1_SW sy-vline 
WA_VIWI01_STR-SUM1_SR sy-vline 
WA_VIWI01_STR-BAUKOT_GES sy-vline 
WA_VIWI01_STR-BAUKOT_OW sy-vline 
WA_VIWI01_STR-BAUKOT_SW sy-vline 
WA_VIWI01_STR-BAUKOT_SR sy-vline 
WA_VIWI01_STR-BAUKOG_GES sy-vline 
WA_VIWI01_STR-BAUKOG_OW sy-vline 
WA_VIWI01_STR-BAUKOG_SW sy-vline 
WA_VIWI01_STR-BAUKOG_SR sy-vline 
WA_VIWI01_STR-BAUKOA_GES sy-vline 
WA_VIWI01_STR-BAUKOA_OW sy-vline 
WA_VIWI01_STR-BAUKOA_SW sy-vline 
WA_VIWI01_STR-BAUKOA_SR sy-vline 
WA_VIWI01_STR-BAUKOB_GES sy-vline 
WA_VIWI01_STR-BAUKOB_OW sy-vline 
WA_VIWI01_STR-BAUKOB_SW sy-vline 
WA_VIWI01_STR-BAUKOB_SR sy-vline 
WA_VIWI01_STR-GERAET_GES sy-vline 
WA_VIWI01_STR-GERAET_OW sy-vline 
WA_VIWI01_STR-GERAET_SW sy-vline 
WA_VIWI01_STR-GERAET_SR sy-vline 
WA_VIWI01_STR-AUSSEN_GES sy-vline 
WA_VIWI01_STR-AUSSEN_OW sy-vline 
WA_VIWI01_STR-AUSSEN_SW sy-vline 
WA_VIWI01_STR-AUSSEN_SR sy-vline 
WA_VIWI01_STR-ZUSATZ_GES sy-vline 
WA_VIWI01_STR-ZUSATZ_OW sy-vline 
WA_VIWI01_STR-ZUSATZ_SW sy-vline 
WA_VIWI01_STR-ZUSATZ_SR sy-vline 
WA_VIWI01_STR-NEBENA_GES sy-vline 
WA_VIWI01_STR-NEBENA_OW sy-vline 
WA_VIWI01_STR-NEBENA_SW sy-vline 
WA_VIWI01_STR-NEBENA_SR sy-vline 
WA_VIWI01_STR-NEBENV_GES sy-vline 
WA_VIWI01_STR-NEBENV_OW sy-vline 
WA_VIWI01_STR-NEBENV_SW sy-vline 
WA_VIWI01_STR-NEBENV_SR sy-vline 
WA_VIWI01_STR-NEBENB_GES sy-vline 
WA_VIWI01_STR-NEBENB_OW sy-vline 
WA_VIWI01_STR-NEBENB_SW sy-vline 
WA_VIWI01_STR-NEBENB_SR sy-vline 
WA_VIWI01_STR-NEBENK_GES sy-vline 
WA_VIWI01_STR-NEBENK_OW sy-vline 
WA_VIWI01_STR-NEBENK_SW sy-vline 
WA_VIWI01_STR-NEBENK_SR sy-vline 
WA_VIWI01_STR-NEBENF_GES sy-vline 
WA_VIWI01_STR-NEBENF_OW sy-vline 
WA_VIWI01_STR-NEBENF_SW sy-vline 
WA_VIWI01_STR-NEBENF_SR sy-vline 
WA_VIWI01_STR-NEBENS_GES sy-vline 
WA_VIWI01_STR-NEBENS_OW sy-vline 
WA_VIWI01_STR-NEBENS_SW sy-vline 
WA_VIWI01_STR-NEBENS_SR sy-vline 
WA_VIWI01_STR-SUM2_GES sy-vline 
WA_VIWI01_STR-SUM2_OW sy-vline 
WA_VIWI01_STR-SUM2_SW sy-vline 
WA_VIWI01_STR-SUM2_SR sy-vline 
WA_VIWI01_STR-PARKPL_GES sy-vline 
WA_VIWI01_STR-PARKPL_OW sy-vline 
WA_VIWI01_STR-PARKPL_SW sy-vline 
WA_VIWI01_STR-PARKPL_SR sy-vline 
WA_VIWI01_STR-SUM3_GES sy-vline 
WA_VIWI01_STR-SUM3_OW sy-vline 
WA_VIWI01_STR-SUM3_SW sy-vline 
WA_VIWI01_STR-SUM3_SR sy-vline 
WA_VIWI01_STR-GESSUM_GES sy-vline 
WA_VIWI01_STR-GESSUM_OW sy-vline 
WA_VIWI01_STR-GESSUM_SW sy-vline 
WA_VIWI01_STR-GESSUM_SR sy-vline 
WA_VIWI01_STR-BAU_KAUF sy-vline 
WA_VIWI01_STR-BAU_VERKW sy-vline 
WA_VIWI01_STR-BAU_FLAE sy-vline 
WA_VIWI01_STR-BAU_KSUM sy-vline 
WA_VIWI01_STR-BAU_VSUM sy-vline 
WA_VIWI01_STR-BAU_ERW sy-vline 
WA_VIWI01_STR-BAU_FREI sy-vline 
WA_VIWI01_STR-BAU_BAUPL sy-vline 
WA_VIWI01_STR-ERS_OEFF sy-vline 
WA_VIWI01_STR-ERS_NOEFF sy-vline 
WA_VIWI01_STR-ERS_AND sy-vline 
WA_VIWI01_STR-KOS_M3 sy-vline 
WA_VIWI01_STR-KOS_BETM3 sy-vline 
WA_VIWI01_STR-PARK_ANZ sy-vline 
WA_VIWI01_STR-PARK_BETR sy-vline 
WA_VIWI01_STR-AANL_EINF sy-vline 
WA_VIWI01_STR-AANL_GELA sy-vline 
WA_VIWI01_STR-AANL_VERS sy-vline 
WA_VIWI01_STR-AANL_WIRT sy-vline 
WA_VIWI01_STR-AANL_KUNS sy-vline 
WA_VIWI01_STR-AANL_SOND sy-vline 
WA_VIWI01_STR-AANL_VERK sy-vline 
WA_VIWI01_STR-AANL_GRUE sy-vline 
WA_VIWI01_STR-AANL_SONS sy-vline      INTO ld_text SEPARATED BY SPACE.

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