ABAP Select data from SAP table CMDS_KNVP_S into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMDS_KNVP_S
*  INTO TABLE @DATA(IT_CMDS_KNVP_S2).
*--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_CMDS_KNVP_S INDEX 1 INTO DATA(WA_CMDS_KNVP_S2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMDS_KNVP_S>-OLD_DATA = 1.
<CMDS_KNVP_S>-MANDT = 1.
<CMDS_KNVP_S>-KUNNR = 1.
<CMDS_KNVP_S>-VKORG = 1.
<CMDS_KNVP_S>-VTWEG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMDS_KNVP_S-SPART, sy-vline,
  WA_CMDS_KNVP_S-PARVW, sy-vline,
  WA_CMDS_KNVP_S-PARZA, sy-vline,
  WA_CMDS_KNVP_S-KUNN2, sy-vline,
  WA_CMDS_KNVP_S-LIFNR, sy-vline,
  WA_CMDS_KNVP_S-PERNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMDS_KNVP_S 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_CMDS_KNVP_S 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_CMDS_KNVP_S INTO WA_CMDS_KNVP_S.


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

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_CMDS_KNVP_S-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMDS_KNVP_S-PARVW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMDS_KNVP_S-KUNN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMDS_KNVP_S-KUNN2.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_CMDS_KNVP_S-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMDS_KNVP_S-PARVW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMDS_KNVP_S-KUNN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMDS_KNVP_S-KUNN2.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMDS_KNVP_S-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMDS_KNVP_S-ADRNR.
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_CMDS_KNVP_S_STR, 
OLD_DATA TYPE STRING,
MANDT TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
PARVW TYPE STRING,
PARZA TYPE STRING,
KUNN2 TYPE STRING,
LIFNR TYPE STRING,
PERNR TYPE STRING,
PARNR TYPE STRING,
KNREF TYPE STRING,
DEFPA TYPE STRING,
ADRNR TYPE STRING,
NEW_DATA TYPE STRING,
MANDT TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
PARVW TYPE STRING,
PARZA TYPE STRING,
KUNN2 TYPE STRING,
LIFNR TYPE STRING,
PERNR TYPE STRING,
PARNR TYPE STRING,
KNREF TYPE STRING,
DEFPA TYPE STRING,
ADRNR TYPE STRING,
UPD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMDS_KNVP_S_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_CMDS_KNVP_S_STR-OLD_DATA sy-vline 
WA_CMDS_KNVP_S_STR-MANDT sy-vline 
WA_CMDS_KNVP_S_STR-KUNNR sy-vline 
WA_CMDS_KNVP_S_STR-VKORG sy-vline 
WA_CMDS_KNVP_S_STR-VTWEG sy-vline 
WA_CMDS_KNVP_S_STR-SPART sy-vline 
WA_CMDS_KNVP_S_STR-PARVW sy-vline 
WA_CMDS_KNVP_S_STR-PARZA sy-vline 
WA_CMDS_KNVP_S_STR-KUNN2 sy-vline 
WA_CMDS_KNVP_S_STR-LIFNR sy-vline 
WA_CMDS_KNVP_S_STR-PERNR sy-vline 
WA_CMDS_KNVP_S_STR-PARNR sy-vline 
WA_CMDS_KNVP_S_STR-KNREF sy-vline 
WA_CMDS_KNVP_S_STR-DEFPA sy-vline 
WA_CMDS_KNVP_S_STR-ADRNR sy-vline 
WA_CMDS_KNVP_S_STR-NEW_DATA sy-vline 
WA_CMDS_KNVP_S_STR-MANDT sy-vline 
WA_CMDS_KNVP_S_STR-KUNNR sy-vline 
WA_CMDS_KNVP_S_STR-VKORG sy-vline 
WA_CMDS_KNVP_S_STR-VTWEG sy-vline 
WA_CMDS_KNVP_S_STR-SPART sy-vline 
WA_CMDS_KNVP_S_STR-PARVW sy-vline 
WA_CMDS_KNVP_S_STR-PARZA sy-vline 
WA_CMDS_KNVP_S_STR-KUNN2 sy-vline 
WA_CMDS_KNVP_S_STR-LIFNR sy-vline 
WA_CMDS_KNVP_S_STR-PERNR sy-vline 
WA_CMDS_KNVP_S_STR-PARNR sy-vline 
WA_CMDS_KNVP_S_STR-KNREF sy-vline 
WA_CMDS_KNVP_S_STR-DEFPA sy-vline 
WA_CMDS_KNVP_S_STR-ADRNR sy-vline 
WA_CMDS_KNVP_S_STR-UPD sy-vline      INTO ld_text SEPARATED BY SPACE.

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