ABAP Select data from SAP table KLBASD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLBASD
*  INTO TABLE @DATA(IT_KLBASD2).
*--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_KLBASD INDEX 1 INTO DATA(WA_KLBASD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLBASD>-STATU = 1.
<KLBASD>-KLAGR = 1.
<KLBASD>-SICHT = 1.
<KLBASD>-VONDT = 1.
<KLBASD>-BISDT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLBASD-BGRKP, sy-vline,
  WA_KLBASD-BGRKL, sy-vline,
  WA_KLBASD-BGRSE, sy-vline,
  WA_KLBASD-PRAUS, sy-vline,
  WA_KLBASD-WAAUS, sy-vline,
  WA_KLBASD-ERAUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLBASD 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_KLBASD 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_KLBASD INTO WA_KLBASD.


*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_KLBASD_STR, 
STATU TYPE STRING,
KLAGR TYPE STRING,
SICHT TYPE STRING,
VONDT TYPE STRING,
BISDT TYPE STRING,
BGRKP TYPE STRING,
BGRKL TYPE STRING,
BGRSE TYPE STRING,
PRAUS TYPE STRING,
WAAUS TYPE STRING,
ERAUS TYPE STRING,
LOCLA TYPE STRING,
KATALOG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLBASD_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_KLBASD_STR-STATU sy-vline 
WA_KLBASD_STR-KLAGR sy-vline 
WA_KLBASD_STR-SICHT sy-vline 
WA_KLBASD_STR-VONDT sy-vline 
WA_KLBASD_STR-BISDT sy-vline 
WA_KLBASD_STR-BGRKP sy-vline 
WA_KLBASD_STR-BGRKL sy-vline 
WA_KLBASD_STR-BGRSE sy-vline 
WA_KLBASD_STR-PRAUS sy-vline 
WA_KLBASD_STR-WAAUS sy-vline 
WA_KLBASD_STR-ERAUS sy-vline 
WA_KLBASD_STR-LOCLA sy-vline 
WA_KLBASD_STR-KATALOG sy-vline      INTO ld_text SEPARATED BY SPACE.

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