ABAP Select data from SAP table WRF_MATGRP_PROD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WRF_MATGRP_PROD
*  INTO TABLE @DATA(IT_WRF_MATGRP_PROD2).
*--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_WRF_MATGRP_PROD INDEX 1 INTO DATA(WA_WRF_MATGRP_PROD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WRF_MATGRP_PROD>-MANDT = 1.
<WRF_MATGRP_PROD>-MATNR = 1.
<WRF_MATGRP_PROD>-HIER_ID = 1.
<WRF_MATGRP_PROD>-NODE = 1.
<WRF_MATGRP_PROD>-DATE_FROM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WRF_MATGRP_PROD-DATE_TO, sy-vline,
  WA_WRF_MATGRP_PROD-STRATEGY, sy-vline,
  WA_WRF_MATGRP_PROD-MAINFLG, sy-vline,
  WA_WRF_MATGRP_PROD-HIERNODE1, sy-vline,
  WA_WRF_MATGRP_PROD-HIERNODE2, sy-vline,
  WA_WRF_MATGRP_PROD-HIERNODE3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WRF_MATGRP_PROD 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_WRF_MATGRP_PROD 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_WRF_MATGRP_PROD INTO WA_WRF_MATGRP_PROD.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WRF_MATGRP_PROD-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WRF_MATGRP_PROD-MATNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field LINUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WRF_MATGRP_PROD-LINUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WRF_MATGRP_PROD-LINUNIT.
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_WRF_MATGRP_PROD_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
HIER_ID TYPE STRING,
NODE TYPE STRING,
DATE_FROM TYPE STRING,
DATE_TO TYPE STRING,
STRATEGY TYPE STRING,
MAINFLG TYPE STRING,
HIERNODE1 TYPE STRING,
HIERNODE2 TYPE STRING,
HIERNODE3 TYPE STRING,
HIERNODE4 TYPE STRING,
HIERNODE5 TYPE STRING,
HIERNODE6 TYPE STRING,
HIERNODE7 TYPE STRING,
HIERNODE8 TYPE STRING,
HIERNODE9 TYPE STRING,
HIERNODE10 TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SHLFSPC TYPE STRING,
LINSPC TYPE STRING,
SPACEUNIT TYPE STRING,
LINUNIT TYPE STRING,
CHKDATE TYPE STRING,
TIMESTAMP TYPE STRING,
DELETEFLAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WRF_MATGRP_PROD_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_WRF_MATGRP_PROD_STR-MANDT sy-vline 
WA_WRF_MATGRP_PROD_STR-MATNR sy-vline 
WA_WRF_MATGRP_PROD_STR-HIER_ID sy-vline 
WA_WRF_MATGRP_PROD_STR-NODE sy-vline 
WA_WRF_MATGRP_PROD_STR-DATE_FROM sy-vline 
WA_WRF_MATGRP_PROD_STR-DATE_TO sy-vline 
WA_WRF_MATGRP_PROD_STR-STRATEGY sy-vline 
WA_WRF_MATGRP_PROD_STR-MAINFLG sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE1 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE2 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE3 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE4 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE5 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE6 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE7 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE8 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE9 sy-vline 
WA_WRF_MATGRP_PROD_STR-HIERNODE10 sy-vline 
WA_WRF_MATGRP_PROD_STR-VKORG sy-vline 
WA_WRF_MATGRP_PROD_STR-VTWEG sy-vline 
WA_WRF_MATGRP_PROD_STR-SHLFSPC sy-vline 
WA_WRF_MATGRP_PROD_STR-LINSPC sy-vline 
WA_WRF_MATGRP_PROD_STR-SPACEUNIT sy-vline 
WA_WRF_MATGRP_PROD_STR-LINUNIT sy-vline 
WA_WRF_MATGRP_PROD_STR-CHKDATE sy-vline 
WA_WRF_MATGRP_PROD_STR-TIMESTAMP sy-vline 
WA_WRF_MATGRP_PROD_STR-DELETEFLAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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