ABAP Select data from SAP table KONVCD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KONVCD
*  INTO TABLE @DATA(IT_KONVCD2).
*--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_KONVCD INDEX 1 INTO DATA(WA_KONVCD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KONVCD>-KPOSN = 1.
<KONVCD>-WKOPAR = 1.
<KONVCD>-STUNR = 1.
<KONVCD>-ZAEHK = 1.
<KONVCD>-KSCHL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KONVCD-KBETR, sy-vline,
  WA_KONVCD-WAERS, sy-vline,
  WA_KONVCD-KPEIN, sy-vline,
  WA_KONVCD-KMEIN, sy-vline,
  WA_KONVCD-LIFNR, sy-vline,
  WA_KONVCD-KUNNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KONVCD 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_KONVCD 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_KONVCD INTO WA_KONVCD.


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

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

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KONVCD-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KONVCD-KUNNR.
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_KONVCD_STR, 
KPOSN TYPE STRING,
WKOPAR TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
KSCHL TYPE STRING,
KBETR TYPE STRING,
WAERS TYPE STRING,
KPEIN TYPE STRING,
KMEIN TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KONVCD_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_KONVCD_STR-KPOSN sy-vline 
WA_KONVCD_STR-WKOPAR sy-vline 
WA_KONVCD_STR-STUNR sy-vline 
WA_KONVCD_STR-ZAEHK sy-vline 
WA_KONVCD_STR-KSCHL sy-vline 
WA_KONVCD_STR-KBETR sy-vline 
WA_KONVCD_STR-WAERS sy-vline 
WA_KONVCD_STR-KPEIN sy-vline 
WA_KONVCD_STR-KMEIN sy-vline 
WA_KONVCD_STR-LIFNR sy-vline 
WA_KONVCD_STR-KUNNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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