ABAP Select data from SAP table RFKCH1 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFKCH1 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 RFKCH1. 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 RFKCH1 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_RFKCH1 TYPE STANDARD TABLE OF RFKCH1,
      WA_RFKCH1 TYPE RFKCH1,
      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: <RFKCH1> TYPE RFKCH1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RFKCH1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RFKCH1
  INTO TABLE IT_RFKCH1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFKCH1
*  INTO TABLE @DATA(IT_RFKCH12).
*--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_RFKCH1 INDEX 1 INTO DATA(WA_RFKCH12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RFKCH1 ASSIGNING <RFKCH1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFKCH1>-OPBEL = 1.
<RFKCH1>-TXTVW = 1.
<RFKCH1>-GPART = 1.
<RFKCH1>-VKONT = 1.
<RFKCH1>-VTREF = 1.

ENDLOOP.

LOOP AT IT_RFKCH1 INTO WA_RFKCH1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFKCH1-SUBAP, sy-vline,
  WA_RFKCH1-EMADR, sy-vline,
  WA_RFKCH1-WAERS, sy-vline,
  WA_RFKCH1-BETRW, sy-vline,
  WA_RFKCH1-HBKID, sy-vline,
  WA_RFKCH1-HKTID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFKCH1 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_RFKCH1 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_RFKCH1 INTO WA_RFKCH1.


*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 OPBEL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKCH1-OPBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKCH1-OPBEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKCH1-GPART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKCH1-GPART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VKONT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKCH1-VKONT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKCH1-VKONT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VTREF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKCH1-VTREF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKCH1-VTREF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EMADR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKCH1-EMADR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKCH1-EMADR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ZTNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RFKCH1-ZTNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFKCH1-ZTNUM.
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_RFKCH1_STR, 
OPBEL TYPE STRING,
TXTVW TYPE STRING,
GPART TYPE STRING,
VKONT TYPE STRING,
VTREF TYPE STRING,
SUBAP TYPE STRING,
EMADR TYPE STRING,
WAERS TYPE STRING,
BETRW TYPE STRING,
HBKID TYPE STRING,
HKTID TYPE STRING,
ZTNUM TYPE STRING,
XPRND TYPE STRING,
NUMTY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFKCH1_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_RFKCH1_STR-OPBEL sy-vline 
WA_RFKCH1_STR-TXTVW sy-vline 
WA_RFKCH1_STR-GPART sy-vline 
WA_RFKCH1_STR-VKONT sy-vline 
WA_RFKCH1_STR-VTREF sy-vline 
WA_RFKCH1_STR-SUBAP sy-vline 
WA_RFKCH1_STR-EMADR sy-vline 
WA_RFKCH1_STR-WAERS sy-vline 
WA_RFKCH1_STR-BETRW sy-vline 
WA_RFKCH1_STR-HBKID sy-vline 
WA_RFKCH1_STR-HKTID sy-vline 
WA_RFKCH1_STR-ZTNUM sy-vline 
WA_RFKCH1_STR-XPRND sy-vline 
WA_RFKCH1_STR-NUMTY sy-vline      INTO ld_text SEPARATED BY SPACE.

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