ABAP Select data from SAP table TKKAZ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKKAZ
*  INTO TABLE @DATA(IT_TKKAZ2).
*--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_TKKAZ INDEX 1 INTO DATA(WA_TKKAZ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKKAZ>-MANDT = 1.
<TKKAZ>-KOKRS = 1.
<TKKAZ>-VERSA = 1.
<TKKAZ>-ABGSL = 1.
<TKKAZ>-KOAMK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKKAZ-KRKMK, sy-vline,
  WA_TKKAZ-KSTMK, sy-vline,
  WA_TKKAZ-LARMK, sy-vline,
  WA_TKKAZ-PRZMK, sy-vline,
  WA_TKKAZ-BEKMK, sy-vline,
  WA_TKKAZ-VFKMK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKKAZ 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_TKKAZ 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_TKKAZ INTO WA_TKKAZ.


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

*Conversion exit KKAPJ, internal->external for field ZGLAB
CALL FUNCTION 'CONVERSION_EXIT_KKAPJ_OUTPUT'
  EXPORTING
    input =                      WA_TKKAZ-ZGLAB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TKKAZ-ZGLAB.
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_TKKAZ_STR, 
MANDT TYPE STRING,
KOKRS TYPE STRING,
VERSA TYPE STRING,
ABGSL TYPE STRING,
KOAMK TYPE STRING,
KRKMK TYPE STRING,
KSTMK TYPE STRING,
LARMK TYPE STRING,
PRZMK TYPE STRING,
BEKMK TYPE STRING,
VFKMK TYPE STRING,
KYRS1 TYPE STRING,
KYRS2 TYPE STRING,
KYRS3 TYPE STRING,
BEMMK TYPE STRING,
ZGLAB TYPE STRING,
ZIDAP TYPE STRING,
ZIDAW TYPE STRING,
ZIDNF TYPE STRING,
AWRPZ TYPE STRING,
NAFPZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKKAZ_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_TKKAZ_STR-MANDT sy-vline 
WA_TKKAZ_STR-KOKRS sy-vline 
WA_TKKAZ_STR-VERSA sy-vline 
WA_TKKAZ_STR-ABGSL sy-vline 
WA_TKKAZ_STR-KOAMK sy-vline 
WA_TKKAZ_STR-KRKMK sy-vline 
WA_TKKAZ_STR-KSTMK sy-vline 
WA_TKKAZ_STR-LARMK sy-vline 
WA_TKKAZ_STR-PRZMK sy-vline 
WA_TKKAZ_STR-BEKMK sy-vline 
WA_TKKAZ_STR-VFKMK sy-vline 
WA_TKKAZ_STR-KYRS1 sy-vline 
WA_TKKAZ_STR-KYRS2 sy-vline 
WA_TKKAZ_STR-KYRS3 sy-vline 
WA_TKKAZ_STR-BEMMK sy-vline 
WA_TKKAZ_STR-ZGLAB sy-vline 
WA_TKKAZ_STR-ZIDAP sy-vline 
WA_TKKAZ_STR-ZIDAW sy-vline 
WA_TKKAZ_STR-ZIDNF sy-vline 
WA_TKKAZ_STR-AWRPZ sy-vline 
WA_TKKAZ_STR-NAFPZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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