ABAP Select data from SAP table KKATAB0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KKATAB0 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 KKATAB0. 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 KKATAB0 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_KKATAB0 TYPE STANDARD TABLE OF KKATAB0,
      WA_KKATAB0 TYPE KKATAB0,
      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: <KKATAB0> TYPE KKATAB0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KKATAB0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KKATAB0
  INTO TABLE IT_KKATAB0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KKATAB0
*  INTO TABLE @DATA(IT_KKATAB02).
*--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_KKATAB0 INDEX 1 INTO DATA(WA_KKATAB02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KKATAB0 ASSIGNING <KKATAB0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KKATAB0>-NR = 1.
<KKATAB0>-WRTTP = 1.
<KKATAB0>-VERSN = 1.
<KKATAB0>-GJAHR = 1.
<KKATAB0>-SBJHR = 1.

ENDLOOP.

LOOP AT IT_KKATAB0 INTO WA_KKATAB0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KKATAB0-MNG01, sy-vline,
  WA_KKATAB0-MNG02, sy-vline,
  WA_KKATAB0-MNG03, sy-vline,
  WA_KKATAB0-MNG04, sy-vline,
  WA_KKATAB0-MNG05, sy-vline,
  WA_KKATAB0-MNG06, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KKATAB0 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_KKATAB0 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_KKATAB0 INTO WA_KKATAB0.


*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 WRTTP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KKATAB0-WRTTP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KKATAB0-WRTTP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KKATAB0-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KKATAB0-VERSN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_KKATAB0-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KKATAB0-GJAHR.
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_KKATAB0_STR, 
NR TYPE STRING,
WRTTP TYPE STRING,
VERSN TYPE STRING,
GJAHR TYPE STRING,
SBJHR TYPE STRING,
MNG01 TYPE STRING,
MNG02 TYPE STRING,
MNG03 TYPE STRING,
MNG04 TYPE STRING,
MNG05 TYPE STRING,
MNG06 TYPE STRING,
MNG07 TYPE STRING,
MNG08 TYPE STRING,
MNG09 TYPE STRING,
MNG10 TYPE STRING,
MNG11 TYPE STRING,
MNG12 TYPE STRING,
MNG13 TYPE STRING,
MNG14 TYPE STRING,
MNG15 TYPE STRING,
MNG16 TYPE STRING,
MNG01K TYPE STRING,
MNG02K TYPE STRING,
MNG03K TYPE STRING,
MNG04K TYPE STRING,
MNG05K TYPE STRING,
MNG06K TYPE STRING,
MNG07K TYPE STRING,
MNG08K TYPE STRING,
MNG09K TYPE STRING,
MNG10K TYPE STRING,
MNG11K TYPE STRING,
MNG12K TYPE STRING,
MNG13K TYPE STRING,
MNG14K TYPE STRING,
MNG15K TYPE STRING,
MNG16K TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KKATAB0_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_KKATAB0_STR-NR sy-vline 
WA_KKATAB0_STR-WRTTP sy-vline 
WA_KKATAB0_STR-VERSN sy-vline 
WA_KKATAB0_STR-GJAHR sy-vline 
WA_KKATAB0_STR-SBJHR sy-vline 
WA_KKATAB0_STR-MNG01 sy-vline 
WA_KKATAB0_STR-MNG02 sy-vline 
WA_KKATAB0_STR-MNG03 sy-vline 
WA_KKATAB0_STR-MNG04 sy-vline 
WA_KKATAB0_STR-MNG05 sy-vline 
WA_KKATAB0_STR-MNG06 sy-vline 
WA_KKATAB0_STR-MNG07 sy-vline 
WA_KKATAB0_STR-MNG08 sy-vline 
WA_KKATAB0_STR-MNG09 sy-vline 
WA_KKATAB0_STR-MNG10 sy-vline 
WA_KKATAB0_STR-MNG11 sy-vline 
WA_KKATAB0_STR-MNG12 sy-vline 
WA_KKATAB0_STR-MNG13 sy-vline 
WA_KKATAB0_STR-MNG14 sy-vline 
WA_KKATAB0_STR-MNG15 sy-vline 
WA_KKATAB0_STR-MNG16 sy-vline 
WA_KKATAB0_STR-MNG01K sy-vline 
WA_KKATAB0_STR-MNG02K sy-vline 
WA_KKATAB0_STR-MNG03K sy-vline 
WA_KKATAB0_STR-MNG04K sy-vline 
WA_KKATAB0_STR-MNG05K sy-vline 
WA_KKATAB0_STR-MNG06K sy-vline 
WA_KKATAB0_STR-MNG07K sy-vline 
WA_KKATAB0_STR-MNG08K sy-vline 
WA_KKATAB0_STR-MNG09K sy-vline 
WA_KKATAB0_STR-MNG10K sy-vline 
WA_KKATAB0_STR-MNG11K sy-vline 
WA_KKATAB0_STR-MNG12K sy-vline 
WA_KKATAB0_STR-MNG13K sy-vline 
WA_KKATAB0_STR-MNG14K sy-vline 
WA_KKATAB0_STR-MNG15K sy-vline 
WA_KKATAB0_STR-MNG16K sy-vline      INTO ld_text SEPARATED BY SPACE.

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