ABAP Select data from SAP table KLDAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLDAT
*  INTO TABLE @DATA(IT_KLDAT2).
*--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_KLDAT INDEX 1 INTO DATA(WA_KLDAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLDAT>-POSNR = 1.
<KLDAT>-SMBEZ = 1.
<KLDAT>-EINER = 1.
<KLDAT>-DIMEN = 1.
<KLDAT>-FORMT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLDAT-ANZST, sy-vline,
  WA_KLDAT-ANZDZ, sy-vline,
  WA_KLDAT-ATSCH, sy-vline,
  WA_KLDAT-DINBU, sy-vline,
  WA_KLDAT-ATVOR, sy-vline,
  WA_KLDAT-ATEIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLDAT 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_KLDAT 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_KLDAT INTO WA_KLDAT.


*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 ATINN, internal->external for field ATINN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_KLDAT-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLDAT-ATINN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ATINN, internal->external for field ATINO
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_KLDAT-ATINO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLDAT-ATINO.
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_KLDAT_STR, 
POSNR TYPE STRING,
SMBEZ TYPE STRING,
EINER TYPE STRING,
DIMEN TYPE STRING,
FORMT TYPE STRING,
ANZST TYPE STRING,
ANZDZ TYPE STRING,
ATSCH TYPE STRING,
DINBU TYPE STRING,
ATVOR TYPE STRING,
ATEIN TYPE STRING,
ATINT TYPE STRING,
ATKLE TYPE STRING,
ATINN TYPE STRING,
ATINO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLDAT_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_KLDAT_STR-POSNR sy-vline 
WA_KLDAT_STR-SMBEZ sy-vline 
WA_KLDAT_STR-EINER sy-vline 
WA_KLDAT_STR-DIMEN sy-vline 
WA_KLDAT_STR-FORMT sy-vline 
WA_KLDAT_STR-ANZST sy-vline 
WA_KLDAT_STR-ANZDZ sy-vline 
WA_KLDAT_STR-ATSCH sy-vline 
WA_KLDAT_STR-DINBU sy-vline 
WA_KLDAT_STR-ATVOR sy-vline 
WA_KLDAT_STR-ATEIN sy-vline 
WA_KLDAT_STR-ATINT sy-vline 
WA_KLDAT_STR-ATKLE sy-vline 
WA_KLDAT_STR-ATINN sy-vline 
WA_KLDAT_STR-ATINO sy-vline      INTO ld_text SEPARATED BY SPACE.

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