ABAP Select data from SAP table FCALV_S_RMNIWE90_ALV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP FCALV_S_RMNIWE90_ALV 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 FCALV_S_RMNIWE90_ALV. 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 FCALV_S_RMNIWE90_ALV 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_FCALV_S_RMNIWE90_ALV TYPE STANDARD TABLE OF FCALV_S_RMNIWE90_ALV,
      WA_FCALV_S_RMNIWE90_ALV TYPE FCALV_S_RMNIWE90_ALV,
      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: <FCALV_S_RMNIWE90_ALV> TYPE FCALV_S_RMNIWE90_ALV.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_FCALV_S_RMNIWE90_ALV.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM FCALV_S_RMNIWE90_ALV
  INTO TABLE IT_FCALV_S_RMNIWE90_ALV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FCALV_S_RMNIWE90_ALV
*  INTO TABLE @DATA(IT_FCALV_S_RMNIWE90_ALV2).
*--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_FCALV_S_RMNIWE90_ALV INDEX 1 INTO DATA(WA_FCALV_S_RMNIWE90_ALV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_FCALV_S_RMNIWE90_ALV ASSIGNING <FCALV_S_RMNIWE90_ALV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FCALV_S_RMNIWE90_ALV>-BWKEY = 1.
<FCALV_S_RMNIWE90_ALV>-KONTO = 1.
<FCALV_S_RMNIWE90_ALV>-MATNR = 1.
<FCALV_S_RMNIWE90_ALV>-BWTAR = 1.
<FCALV_S_RMNIWE90_ALV>-MAKTX = 1.

ENDLOOP.

LOOP AT IT_FCALV_S_RMNIWE90_ALV INTO WA_FCALV_S_RMNIWE90_ALV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FCALV_S_RMNIWE90_ALV-LBKUM, sy-vline,
  WA_FCALV_S_RMNIWE90_ALV-MEINS, sy-vline,
  WA_FCALV_S_RMNIWE90_ALV-SALK3, sy-vline,
  WA_FCALV_S_RMNIWE90_ALV-WERT1, sy-vline,
  WA_FCALV_S_RMNIWE90_ALV-WERT2, sy-vline,
  WA_FCALV_S_RMNIWE90_ALV-WERT3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FCALV_S_RMNIWE90_ALV 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_FCALV_S_RMNIWE90_ALV 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_FCALV_S_RMNIWE90_ALV INTO WA_FCALV_S_RMNIWE90_ALV.


*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 KONTO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_FCALV_S_RMNIWE90_ALV-KONTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FCALV_S_RMNIWE90_ALV-KONTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_FCALV_S_RMNIWE90_ALV-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FCALV_S_RMNIWE90_ALV-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_FCALV_S_RMNIWE90_ALV-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FCALV_S_RMNIWE90_ALV-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_FCALV_S_RMNIWE90_ALV_STR, 
BWKEY TYPE STRING,
KONTO TYPE STRING,
MATNR TYPE STRING,
BWTAR TYPE STRING,
MAKTX TYPE STRING,
LBKUM TYPE STRING,
MEINS TYPE STRING,
SALK3 TYPE STRING,
WERT1 TYPE STRING,
WERT2 TYPE STRING,
WERT3 TYPE STRING,
WERT4 TYPE STRING,
WERT5 TYPE STRING,
WERT6 TYPE STRING,
BWERT TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FCALV_S_RMNIWE90_ALV_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_FCALV_S_RMNIWE90_ALV_STR-BWKEY sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-KONTO sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-MATNR sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-BWTAR sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-MAKTX sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-LBKUM sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-MEINS sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-SALK3 sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-WERT1 sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-WERT2 sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-WERT3 sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-WERT4 sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-WERT5 sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-WERT6 sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-BWERT sy-vline 
WA_FCALV_S_RMNIWE90_ALV_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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