ABAP Select data from SAP table QKAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QKAT
*  INTO TABLE @DATA(IT_QKAT2).
*--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_QKAT INDEX 1 INTO DATA(WA_QKAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QKAT>-KATALOGART = 1.
<QKAT>-WERKS = 1.
<QKAT>-AUSWAHLMGE = 1.
<QKAT>-CODEGRUPPE = 1.
<QKAT>-CODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QKAT-VERSIONAM, sy-vline,
  WA_QKAT-VERSIONGR, sy-vline,
  WA_QKAT-VERSIONCD, sy-vline,
  WA_QKAT-GUELTIGAM, sy-vline,
  WA_QKAT-GUELTIGGR, sy-vline,
  WA_QKAT-GUELTIGCD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QKAT 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_QKAT 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_QKAT INTO WA_QKAT.


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

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

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

*Conversion exit ISOLA, internal->external for field SPRACHE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_QKAT-SPRACHE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QKAT-SPRACHE.
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_QKAT_STR, 
KATALOGART TYPE STRING,
WERKS TYPE STRING,
AUSWAHLMGE TYPE STRING,
CODEGRUPPE TYPE STRING,
CODE TYPE STRING,
VERSIONAM TYPE STRING,
VERSIONGR TYPE STRING,
VERSIONCD TYPE STRING,
GUELTIGAM TYPE STRING,
GUELTIGGR TYPE STRING,
GUELTIGCD TYPE STRING,
SPRACHE TYPE STRING,
KURZTEXTAM TYPE STRING,
LTEXTAM TYPE STRING,
KURZTEXTGR TYPE STRING,
LTEXTGR TYPE STRING,
KURZTEXTCD TYPE STRING,
LTEXTCD TYPE STRING,
GELOESCHT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QKAT_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_QKAT_STR-KATALOGART sy-vline 
WA_QKAT_STR-WERKS sy-vline 
WA_QKAT_STR-AUSWAHLMGE sy-vline 
WA_QKAT_STR-CODEGRUPPE sy-vline 
WA_QKAT_STR-CODE sy-vline 
WA_QKAT_STR-VERSIONAM sy-vline 
WA_QKAT_STR-VERSIONGR sy-vline 
WA_QKAT_STR-VERSIONCD sy-vline 
WA_QKAT_STR-GUELTIGAM sy-vline 
WA_QKAT_STR-GUELTIGGR sy-vline 
WA_QKAT_STR-GUELTIGCD sy-vline 
WA_QKAT_STR-SPRACHE sy-vline 
WA_QKAT_STR-KURZTEXTAM sy-vline 
WA_QKAT_STR-LTEXTAM sy-vline 
WA_QKAT_STR-KURZTEXTGR sy-vline 
WA_QKAT_STR-LTEXTGR sy-vline 
WA_QKAT_STR-KURZTEXTCD sy-vline 
WA_QKAT_STR-LTEXTCD sy-vline 
WA_QKAT_STR-GELOESCHT sy-vline      INTO ld_text SEPARATED BY SPACE.

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