ABAP Select data from SAP table TZK01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TZK01 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 TZK01. 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 TZK01 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_TZK01 TYPE STANDARD TABLE OF TZK01,
      WA_TZK01 TYPE TZK01,
      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: <TZK01> TYPE TZK01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TZK01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TZK01
  INTO TABLE IT_TZK01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TZK01
*  INTO TABLE @DATA(IT_TZK012).
*--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_TZK01 INDEX 1 INTO DATA(WA_TZK012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TZK01 ASSIGNING <TZK01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TZK01>-MANDT = 1.
<TZK01>-RANTYP = 1.
<TZK01>-SKOART = 1.
<TZK01>-SKOAREF = 1.
<TZK01>-SBEWART1 = 1.

ENDLOOP.

LOOP AT IT_TZK01 INTO WA_TZK01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TZK01-SBEWART2, sy-vline,
  WA_TZK01-SBEWZITI, sy-vline,
  WA_TZK01-AUSWAHL, sy-vline,
  WA_TZK01-SDOKU, sy-vline,
  WA_TZK01-SBERFIMA, sy-vline,
  WA_TZK01-JZINSBAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TZK01 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_TZK01 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_TZK01 INTO WA_TZK01.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_TZK01_STR, 
MANDT TYPE STRING,
RANTYP TYPE STRING,
SKOART TYPE STRING,
SKOAREF TYPE STRING,
SBEWART1 TYPE STRING,
SBEWART2 TYPE STRING,
SBEWZITI TYPE STRING,
AUSWAHL TYPE STRING,
SDOKU TYPE STRING,
SBERFIMA TYPE STRING,
JZINSBAS TYPE STRING,
SEFFZIVZ TYPE STRING,
SZART TYPE STRING,
CONTAB_RELEVANT TYPE STRING,
COND_INCLUSIV TYPE STRING,
COND_CATEGORY TYPE STRING,
COND_VIEW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TZK01_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_TZK01_STR-MANDT sy-vline 
WA_TZK01_STR-RANTYP sy-vline 
WA_TZK01_STR-SKOART sy-vline 
WA_TZK01_STR-SKOAREF sy-vline 
WA_TZK01_STR-SBEWART1 sy-vline 
WA_TZK01_STR-SBEWART2 sy-vline 
WA_TZK01_STR-SBEWZITI sy-vline 
WA_TZK01_STR-AUSWAHL sy-vline 
WA_TZK01_STR-SDOKU sy-vline 
WA_TZK01_STR-SBERFIMA sy-vline 
WA_TZK01_STR-JZINSBAS sy-vline 
WA_TZK01_STR-SEFFZIVZ sy-vline 
WA_TZK01_STR-SZART sy-vline 
WA_TZK01_STR-CONTAB_RELEVANT sy-vline 
WA_TZK01_STR-COND_INCLUSIV sy-vline 
WA_TZK01_STR-COND_CATEGORY sy-vline 
WA_TZK01_STR-COND_VIEW sy-vline      INTO ld_text SEPARATED BY SPACE.

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