ABAP Select data from SAP table WCCMR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCCMR
*  INTO TABLE @DATA(IT_WCCMR2).
*--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_WCCMR INDEX 1 INTO DATA(WA_WCCMR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCCMR>-MANDT = 1.
<WCCMR>-IWERK = 1.
<WCCMR>-GRPDPCTRL = 1.
<WCCMR>-GRPFUNCFLG = 1.
<WCCMR>-GRPDELFLG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCCMR-LNKCTRL, sy-vline,
  WA_WCCMR-LNKDPCTRL, sy-vline,
  WA_WCCMR-LNKFUNCFLG, sy-vline,
  WA_WCCMR-LNKBLSTOBJART, sy-vline,
  WA_WCCMR-LNKBLSTGRP, sy-vline,
  WA_WCCMR-LNKREJBLSTGRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCCMR 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_WCCMR 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_WCCMR INTO WA_WCCMR.


*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_WCCMR_STR, 
MANDT TYPE STRING,
IWERK TYPE STRING,
GRPDPCTRL TYPE STRING,
GRPFUNCFLG TYPE STRING,
GRPDELFLG TYPE STRING,
LNKCTRL TYPE STRING,
LNKDPCTRL TYPE STRING,
LNKFUNCFLG TYPE STRING,
LNKBLSTOBJART TYPE STRING,
LNKBLSTGRP TYPE STRING,
LNKREJBLSTGRP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCCMR_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_WCCMR_STR-MANDT sy-vline 
WA_WCCMR_STR-IWERK sy-vline 
WA_WCCMR_STR-GRPDPCTRL sy-vline 
WA_WCCMR_STR-GRPFUNCFLG sy-vline 
WA_WCCMR_STR-GRPDELFLG sy-vline 
WA_WCCMR_STR-LNKCTRL sy-vline 
WA_WCCMR_STR-LNKDPCTRL sy-vline 
WA_WCCMR_STR-LNKFUNCFLG sy-vline 
WA_WCCMR_STR-LNKBLSTOBJART sy-vline 
WA_WCCMR_STR-LNKBLSTGRP sy-vline 
WA_WCCMR_STR-LNKREJBLSTGRP sy-vline      INTO ld_text SEPARATED BY SPACE.

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