ABAP Select data from SAP table WRF_APC_COMPONENT_STY into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WRF_APC_COMPONENT_STY 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_APC_COMPONENT_STY. 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_APC_COMPONENT_STY 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_APC_COMPONENT_STY TYPE STANDARD TABLE OF WRF_APC_COMPONENT_STY,
      WA_WRF_APC_COMPONENT_STY TYPE WRF_APC_COMPONENT_STY,
      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_APC_COMPONENT_STY> TYPE WRF_APC_COMPONENT_STY.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WRF_APC_COMPONENT_STY
*  INTO TABLE @DATA(IT_WRF_APC_COMPONENT_STY2).
*--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_APC_COMPONENT_STY INDEX 1 INTO DATA(WA_WRF_APC_COMPONENT_STY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WRF_APC_COMPONENT_STY>-IDNRK = 1.
<WRF_APC_COMPONENT_STY>-VARNR = 1.
<WRF_APC_COMPONENT_STY>-ATWRT1 = 1.
<WRF_APC_COMPONENT_STY>-ATWRT2 = 1.
<WRF_APC_COMPONENT_STY>-ATWRT3 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WRF_APC_COMPONENT_STY-MAKTX, sy-vline,
  WA_WRF_APC_COMPONENT_STY-ATTYP, sy-vline,
  WA_WRF_APC_COMPONENT_STY-MATKL, sy-vline,
  WA_WRF_APC_COMPONENT_STY-SATNR, sy-vline,
  WA_WRF_APC_COMPONENT_STY-QUANT, sy-vline,
  WA_WRF_APC_COMPONENT_STY-UNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WRF_APC_COMPONENT_STY 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_APC_COMPONENT_STY 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_APC_COMPONENT_STY INTO WA_WRF_APC_COMPONENT_STY.


*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 IDNRK
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WRF_APC_COMPONENT_STY-IDNRK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WRF_APC_COMPONENT_STY-IDNRK.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WRF_APC_COMPONENT_STY-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WRF_APC_COMPONENT_STY-MEINS.
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_APC_COMPONENT_STY_STR, 
IDNRK TYPE STRING,
VARNR TYPE STRING,
ATWRT1 TYPE STRING,
ATWRT2 TYPE STRING,
ATWRT3 TYPE STRING,
MAKTX TYPE STRING,
ATTYP TYPE STRING,
MATKL TYPE STRING,
SATNR TYPE STRING,
QUANT TYPE STRING,
UNIT TYPE STRING,
QUANT_BUOM TYPE STRING,
MEINS TYPE STRING,
LOCKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WRF_APC_COMPONENT_STY_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_APC_COMPONENT_STY_STR-IDNRK sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-VARNR sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-ATWRT1 sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-ATWRT2 sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-ATWRT3 sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-MAKTX sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-ATTYP sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-MATKL sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-SATNR sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-QUANT sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-UNIT sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-QUANT_BUOM sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-MEINS sy-vline 
WA_WRF_APC_COMPONENT_STY_STR-LOCKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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