ABAP Select data from SAP table WWMID into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WWMID
*  INTO TABLE @DATA(IT_WWMID2).
*--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_WWMID INDEX 1 INTO DATA(WA_WWMID2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WWMID>-MANDT = 1.
<WWMID>-WMINR = 1.
<WWMID>-WMTYP = 1.
<WWMID>-AKTNR = 1.
<WWMID>-LAYVR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WWMID-MEANT, sy-vline,
  WA_WWMID-KZHIR, sy-vline,
  WA_WWMID-ABDAT, sy-vline,
  WA_WWMID-BISDAT, sy-vline,
  WA_WWMID-KALVG, sy-vline,
  WA_WWMID-KUNNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WWMID 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_WWMID 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_WWMID INTO WA_WWMID.


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

*Conversion exit CUNIT, internal->external for field MEANT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WWMID-MEANT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WWMID-MEANT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field ORGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WWMID-ORGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WWMID-ORGSYS.
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_WWMID_STR, 
MANDT TYPE STRING,
WMINR TYPE STRING,
WMTYP TYPE STRING,
AKTNR TYPE STRING,
LAYVR TYPE STRING,
MEANT TYPE STRING,
KZHIR TYPE STRING,
ABDAT TYPE STRING,
BISDAT TYPE STRING,
KALVG TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
STTAG TYPE STRING,
ANZWA TYPE STRING,
KZPRS TYPE STRING,
BEGRU TYPE STRING,
ORGSYS TYPE STRING,
PCTYP TYPE STRING,
CCODE TYPE STRING,
UPDKZ TYPE STRING,
SELKZ TYPE STRING,
WMITX TYPE STRING,
KNAME TYPE STRING,
TVKOT TYPE STRING,
TVTWT TYPE STRING,
TSPAT TYPE STRING,
TVKVT TYPE STRING,
PCTYPT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WWMID_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_WWMID_STR-MANDT sy-vline 
WA_WWMID_STR-WMINR sy-vline 
WA_WWMID_STR-WMTYP sy-vline 
WA_WWMID_STR-AKTNR sy-vline 
WA_WWMID_STR-LAYVR sy-vline 
WA_WWMID_STR-MEANT sy-vline 
WA_WWMID_STR-KZHIR sy-vline 
WA_WWMID_STR-ABDAT sy-vline 
WA_WWMID_STR-BISDAT sy-vline 
WA_WWMID_STR-KALVG sy-vline 
WA_WWMID_STR-KUNNR sy-vline 
WA_WWMID_STR-VKORG sy-vline 
WA_WWMID_STR-VTWEG sy-vline 
WA_WWMID_STR-SPART sy-vline 
WA_WWMID_STR-STTAG sy-vline 
WA_WWMID_STR-ANZWA sy-vline 
WA_WWMID_STR-KZPRS sy-vline 
WA_WWMID_STR-BEGRU sy-vline 
WA_WWMID_STR-ORGSYS sy-vline 
WA_WWMID_STR-PCTYP sy-vline 
WA_WWMID_STR-CCODE sy-vline 
WA_WWMID_STR-UPDKZ sy-vline 
WA_WWMID_STR-SELKZ sy-vline 
WA_WWMID_STR-WMITX sy-vline 
WA_WWMID_STR-KNAME sy-vline 
WA_WWMID_STR-TVKOT sy-vline 
WA_WWMID_STR-TVTWT sy-vline 
WA_WWMID_STR-TSPAT sy-vline 
WA_WWMID_STR-TVKVT sy-vline 
WA_WWMID_STR-PCTYPT sy-vline      INTO ld_text SEPARATED BY SPACE.

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