ABAP Select data from SAP table KLARRC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLARRC
*  INTO TABLE @DATA(IT_KLARRC2).
*--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_KLARRC INDEX 1 INTO DATA(WA_KLARRC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLARRC>-MANDT = 1.
<KLARRC>-ARR = 1.
<KLARRC>-KNZRRF = 1.
<KLARRC>-XKNZFRAGA = 1.
<KLARRC>-TERMINF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLARRC-AUSPRMWAE, sy-vline,
  WA_KLARRC-AUSPRRBD, sy-vline,
  WA_KLARRC-MVCHGELIM, sy-vline,
  WA_KLARRC-RCOMPERDUR, sy-vline,
  WA_KLARRC-RRFIND, sy-vline,
  WA_KLARRC-EZUSAGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLARRC 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_KLARRC 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_KLARRC INTO WA_KLARRC.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_KLARRC_STR, 
MANDT TYPE STRING,
ARR TYPE STRING,
KNZRRF TYPE STRING,
XKNZFRAGA TYPE STRING,
TERMINF TYPE STRING,
AUSPRMWAE TYPE STRING,
AUSPRRBD TYPE STRING,
MVCHGELIM TYPE STRING,
RCOMPERDUR TYPE STRING,
RRFIND TYPE STRING,
EZUSAGE TYPE STRING,
SETTLEMENTRISK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLARRC_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_KLARRC_STR-MANDT sy-vline 
WA_KLARRC_STR-ARR sy-vline 
WA_KLARRC_STR-KNZRRF sy-vline 
WA_KLARRC_STR-XKNZFRAGA sy-vline 
WA_KLARRC_STR-TERMINF sy-vline 
WA_KLARRC_STR-AUSPRMWAE sy-vline 
WA_KLARRC_STR-AUSPRRBD sy-vline 
WA_KLARRC_STR-MVCHGELIM sy-vline 
WA_KLARRC_STR-RCOMPERDUR sy-vline 
WA_KLARRC_STR-RRFIND sy-vline 
WA_KLARRC_STR-EZUSAGE sy-vline 
WA_KLARRC_STR-SETTLEMENTRISK sy-vline      INTO ld_text SEPARATED BY SPACE.

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