ABAP Select data from SAP table VTZK02I1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VTZK02I1 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 VTZK02I1. 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 VTZK02I1 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_VTZK02I1 TYPE STANDARD TABLE OF VTZK02I1,
      WA_VTZK02I1 TYPE VTZK02I1,
      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: <VTZK02I1> TYPE VTZK02I1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VTZK02I1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VTZK02I1
  INTO TABLE IT_VTZK02I1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VTZK02I1
*  INTO TABLE @DATA(IT_VTZK02I12).
*--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_VTZK02I1 INDEX 1 INTO DATA(WA_VTZK02I12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VTZK02I1 ASSIGNING <VTZK02I1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VTZK02I1>-MANDT = 1.
<VTZK02I1>-RANTYP = 1.
<VTZK02I1>-SKOGRP = 1.
<VTZK02I1>-SKOART = 1.
<VTZK02I1>-XKOARTM = 1.

ENDLOOP.

LOOP AT IT_VTZK02I1 INTO WA_VTZK02I1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VTZK02I1-NFOLGE, sy-vline,
  WA_VTZK02I1-NHIER, sy-vline,
  WA_VTZK02I1-JMUSS, sy-vline,
  WA_VTZK02I1-JAUSBL, sy-vline,
  WA_VTZK02I1-XKOGRPL, sy-vline,
  WA_VTZK02I1-JSAVEDEF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VTZK02I1 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_VTZK02I1 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_VTZK02I1 INTO WA_VTZK02I1.


*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_VTZK02I1_STR, 
MANDT TYPE STRING,
RANTYP TYPE STRING,
SKOGRP TYPE STRING,
SKOART TYPE STRING,
XKOARTM TYPE STRING,
NFOLGE TYPE STRING,
NHIER TYPE STRING,
JMUSS TYPE STRING,
JAUSBL TYPE STRING,
XKOGRPL TYPE STRING,
JSAVEDEF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VTZK02I1_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_VTZK02I1_STR-MANDT sy-vline 
WA_VTZK02I1_STR-RANTYP sy-vline 
WA_VTZK02I1_STR-SKOGRP sy-vline 
WA_VTZK02I1_STR-SKOART sy-vline 
WA_VTZK02I1_STR-XKOARTM sy-vline 
WA_VTZK02I1_STR-NFOLGE sy-vline 
WA_VTZK02I1_STR-NHIER sy-vline 
WA_VTZK02I1_STR-JMUSS sy-vline 
WA_VTZK02I1_STR-JAUSBL sy-vline 
WA_VTZK02I1_STR-XKOGRPL sy-vline 
WA_VTZK02I1_STR-JSAVEDEF sy-vline      INTO ld_text SEPARATED BY SPACE.

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