ABAP Select data from SAP table TJKWW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TJKWW
*  INTO TABLE @DATA(IT_TJKWW2).
*--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_TJKWW INDEX 1 INTO DATA(WA_TJKWW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TJKWW>-MANDT = 1.
<TJKWW>-WWWKEY = 1.
<TJKWW>-LANGTEXT = 1.
<TJKWW>-AUART = 1.
<TJKWW>-POART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TJKWW-DRERZ, sy-vline,
  WA_TJKWW-BEZPER, sy-vline,
  WA_TJKWW-BEZUGGRD, sy-vline,
  WA_TJKWW-WERBEART, sy-vline,
  WA_TJKWW-KDGRP, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_TJKWW 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_TJKWW 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_TJKWW INTO WA_TJKWW.


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

*Conversion exit ALPHA, internal->external for field WERBEART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TJKWW-WERBEART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TJKWW-WERBEART.
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_TJKWW_STR, 
MANDT TYPE STRING,
WWWKEY TYPE STRING,
LANGTEXT TYPE STRING,
AUART TYPE STRING,
POART TYPE STRING,
DRERZ TYPE STRING,
BEZPER TYPE STRING,
BEZUGGRD TYPE STRING,
WERBEART TYPE STRING,
KDGRP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TJKWW_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_TJKWW_STR-MANDT sy-vline 
WA_TJKWW_STR-WWWKEY sy-vline 
WA_TJKWW_STR-LANGTEXT sy-vline 
WA_TJKWW_STR-AUART sy-vline 
WA_TJKWW_STR-POART sy-vline 
WA_TJKWW_STR-DRERZ sy-vline 
WA_TJKWW_STR-BEZPER sy-vline 
WA_TJKWW_STR-BEZUGGRD sy-vline 
WA_TJKWW_STR-WERBEART sy-vline 
WA_TJKWW_STR-KDGRP sy-vline      INTO ld_text SEPARATED BY SPACE.

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