ABAP Select data from SAP table V_TZN01 into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TZN01 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 V_TZN01. 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 V_TZN01 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_V_TZN01 TYPE STANDARD TABLE OF V_TZN01,
      WA_V_TZN01 TYPE V_TZN01,
      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: <V_TZN01> TYPE V_TZN01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_TZN01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_TZN01
  INTO TABLE IT_V_TZN01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TZN01
*  INTO TABLE @DATA(IT_V_TZN012).
*--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_V_TZN01 INDEX 1 INTO DATA(WA_V_TZN012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_TZN01 ASSIGNING <V_TZN01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TZN01>-MANDT = 1.
<V_TZN01>-BUKRS = 1.
<V_TZN01>-GSART = 1.
<V_TZN01>-NKOMPPOS = 1.
<V_TZN01>-SKOMPNAM = 1.

ENDLOOP.

LOOP AT IT_V_TZN01 INTO WA_V_TZN01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TZN01-XTEXT, sy-vline,
  WA_V_TZN01-SKOMPART, sy-vline,
  WA_V_TZN01-SKOMPGEN, sy-vline,
  WA_V_TZN01-XKOMPWERT, sy-vline,
  WA_V_TZN01-NUMKR, sy-vline,
  WA_V_TZN01-SKOMPPZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TZN01 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_V_TZN01 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_V_TZN01 INTO WA_V_TZN01.


*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_V_TZN01_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
GSART TYPE STRING,
NKOMPPOS TYPE STRING,
SKOMPNAM TYPE STRING,
XTEXT TYPE STRING,
SKOMPART TYPE STRING,
SKOMPGEN TYPE STRING,
XKOMPWERT TYPE STRING,
NUMKR TYPE STRING,
SKOMPPZ TYPE STRING,
SKOMPPZV TYPE STRING,
RPERFORM TYPE STRING,
RMODP TYPE STRING,
JGSARTGEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TZN01_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_V_TZN01_STR-MANDT sy-vline 
WA_V_TZN01_STR-BUKRS sy-vline 
WA_V_TZN01_STR-GSART sy-vline 
WA_V_TZN01_STR-NKOMPPOS sy-vline 
WA_V_TZN01_STR-SKOMPNAM sy-vline 
WA_V_TZN01_STR-XTEXT sy-vline 
WA_V_TZN01_STR-SKOMPART sy-vline 
WA_V_TZN01_STR-SKOMPGEN sy-vline 
WA_V_TZN01_STR-XKOMPWERT sy-vline 
WA_V_TZN01_STR-NUMKR sy-vline 
WA_V_TZN01_STR-SKOMPPZ sy-vline 
WA_V_TZN01_STR-SKOMPPZV sy-vline 
WA_V_TZN01_STR-RPERFORM sy-vline 
WA_V_TZN01_STR-RMODP sy-vline 
WA_V_TZN01_STR-JGSARTGEN sy-vline      INTO ld_text SEPARATED BY SPACE.

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