ABAP Select data from SAP table RK23F_GENERAL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RK23F_GENERAL 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 RK23F_GENERAL. 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 RK23F_GENERAL 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_RK23F_GENERAL TYPE STANDARD TABLE OF RK23F_GENERAL,
      WA_RK23F_GENERAL TYPE RK23F_GENERAL,
      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: <RK23F_GENERAL> TYPE RK23F_GENERAL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RK23F_GENERAL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RK23F_GENERAL
  INTO TABLE IT_RK23F_GENERAL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RK23F_GENERAL
*  INTO TABLE @DATA(IT_RK23F_GENERAL2).
*--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_RK23F_GENERAL INDEX 1 INTO DATA(WA_RK23F_GENERAL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RK23F_GENERAL ASSIGNING <RK23F_GENERAL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RK23F_GENERAL>-KSTAR = 1.
<RK23F_GENERAL>-STAGR = 1.
<RK23F_GENERAL>-MBGBTR = 1.
<RK23F_GENERAL>-MEINB = 1.
<RK23F_GENERAL>-TARIF = 1.

ENDLOOP.

LOOP AT IT_RK23F_GENERAL INTO WA_RK23F_GENERAL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RK23F_GENERAL-WAERS, sy-vline,
  WA_RK23F_GENERAL-AUSBR, sy-vline,
  WA_RK23F_GENERAL-AUBEH, sy-vline,
  WA_RK23F_GENERAL-PERNR, sy-vline,
  WA_RK23F_GENERAL-SGTXT, sy-vline,
  WA_RK23F_GENERAL-WTGBTR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RK23F_GENERAL 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_RK23F_GENERAL 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_RK23F_GENERAL INTO WA_RK23F_GENERAL.


*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 KSTAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RK23F_GENERAL-KSTAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23F_GENERAL-KSTAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINB
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RK23F_GENERAL-MEINB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23F_GENERAL-MEINB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TARIF
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RK23F_GENERAL-TARIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23F_GENERAL-TARIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field AUBEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RK23F_GENERAL-AUBEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23F_GENERAL-AUBEH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field WTGBTR
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RK23F_GENERAL-WTGBTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23F_GENERAL-WTGBTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field WTFBTR
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RK23F_GENERAL-WTFBTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23F_GENERAL-WTFBTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field WKGBTR
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RK23F_GENERAL-WKGBTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23F_GENERAL-WKGBTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field WKFBTR
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RK23F_GENERAL-WKFBTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23F_GENERAL-WKFBTR.
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_RK23F_GENERAL_STR, 
KSTAR TYPE STRING,
STAGR TYPE STRING,
MBGBTR TYPE STRING,
MEINB TYPE STRING,
TARIF TYPE STRING,
WAERS TYPE STRING,
AUSBR TYPE STRING,
AUBEH TYPE STRING,
PERNR TYPE STRING,
SGTXT TYPE STRING,
WTGBTR TYPE STRING,
WTFBTR TYPE STRING,
WKGBTR TYPE STRING,
WKFBTR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RK23F_GENERAL_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_RK23F_GENERAL_STR-KSTAR sy-vline 
WA_RK23F_GENERAL_STR-STAGR sy-vline 
WA_RK23F_GENERAL_STR-MBGBTR sy-vline 
WA_RK23F_GENERAL_STR-MEINB sy-vline 
WA_RK23F_GENERAL_STR-TARIF sy-vline 
WA_RK23F_GENERAL_STR-WAERS sy-vline 
WA_RK23F_GENERAL_STR-AUSBR sy-vline 
WA_RK23F_GENERAL_STR-AUBEH sy-vline 
WA_RK23F_GENERAL_STR-PERNR sy-vline 
WA_RK23F_GENERAL_STR-SGTXT sy-vline 
WA_RK23F_GENERAL_STR-WTGBTR sy-vline 
WA_RK23F_GENERAL_STR-WTFBTR sy-vline 
WA_RK23F_GENERAL_STR-WKGBTR sy-vline 
WA_RK23F_GENERAL_STR-WKFBTR sy-vline      INTO ld_text SEPARATED BY SPACE.

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