ABAP Select data from SAP table V_TCNO into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TCNO 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_TCNO. 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_TCNO 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_TCNO TYPE STANDARD TABLE OF V_TCNO,
      WA_V_TCNO TYPE V_TCNO,
      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_TCNO> TYPE V_TCNO.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TCNO
*  INTO TABLE @DATA(IT_V_TCNO2).
*--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_TCNO INDEX 1 INTO DATA(WA_V_TCNO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TCNO>-MANDT = 1.
<V_TCNO>-PROFILE = 1.
<V_TCNO>-KTEXT = 1.
<V_TCNO>-AUTOADJUST = 1.
<V_TCNO>-BUTTONPOS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TCNO-DISPBG, sy-vline,
  WA_V_TCNO-DUPMODE, sy-vline,
  WA_V_TCNO-HOFFSET, sy-vline,
  WA_V_TCNO-IGNOREUSER, sy-vline,
  WA_V_TCNO-INODESIZE, sy-vline,
  WA_V_TCNO-INSMODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TCNO 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_TCNO 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_TCNO INTO WA_V_TCNO.


*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_TCNO_STR, 
MANDT TYPE STRING,
PROFILE TYPE STRING,
KTEXT TYPE STRING,
AUTOADJUST TYPE STRING,
BUTTONPOS TYPE STRING,
DISPBG TYPE STRING,
DUPMODE TYPE STRING,
HOFFSET TYPE STRING,
IGNOREUSER TYPE STRING,
INODESIZE TYPE STRING,
INSMODE TYPE STRING,
LAYBG TYPE STRING,
LAYFG TYPE STRING,
LAYORDER TYPE STRING,
LAYSTYLE TYPE STRING,
LBUTTBG TYPE STRING,
LBUTTFG TYPE STRING,
MARKNODE TYPE STRING,
MODMODE TYPE STRING,
NAVBG TYPE STRING,
NAVFRMCOL TYPE STRING,
NODEBG TYPE STRING,
NODESIZE TYPE STRING,
OBUTTBG TYPE STRING,
OBUTTFG TYPE STRING,
ORDBG TYPE STRING,
ORDFG TYPE STRING,
SELLINECOL TYPE STRING,
SELOBJMODE TYPE STRING,
SELTYPMODE TYPE STRING,
TRCKFRMCOL TYPE STRING,
VIEW1BG TYPE STRING,
VIEW2BG TYPE STRING,
VIEW3BG TYPE STRING,
VOFFSET TYPE STRING,
XPERCENT TYPE STRING,
YPERCENT TYPE STRING,
ZOOMFAC TYPE STRING,
MARKLINK TYPE STRING,
CONMODE TYPE STRING,
TIMER TYPE STRING,
DBLCLICK TYPE STRING,
AUTOPORT TYPE STRING,
UDM TYPE STRING,
ROUNDED TYPE STRING,
XPOSITION TYPE STRING,
YPOSITION TYPE STRING,
XSIZE TYPE STRING,
YSIZE TYPE STRING,
TRACKOPT TYPE STRING,
CLROWS TYPE STRING,
CLCOLS TYPE STRING,
CLRASTER TYPE STRING,
CLCOLWD TYPE STRING,
MASTERVIEW TYPE STRING,
LEGEND TYPE STRING,
SUBCHART TYPE STRING,
SUBINDEX TYPE STRING,
INFOTEXTS TYPE STRING,
TITLEBOX TYPE STRING,
PORTSIZE TYPE STRING,
AUTO_CLUST TYPE STRING,
LAYOUT TYPE STRING,
CLDELS TYPE STRING,
TBXZOOM TYPE STRING,
BREAKCON TYPE STRING,
NODELMSG TYPE STRING,
INFOTXTNUM TYPE STRING,
STGAUGE TYPE STRING,
SHORTLINK TYPE STRING,
USRPOPS TYPE STRING,
LINKINCLUS TYPE STRING,
NODUPMOVE TYPE STRING,
INNERPICKM TYPE STRING,
NOBOXMOVE TYPE STRING,
COMPACTNOD TYPE STRING,
COMPCTINOD TYPE STRING,
TOOLTIP TYPE STRING,
BMPDISPAR TYPE STRING,
BMPNODEAR TYPE STRING,
BMPNAVAR TYPE STRING,
UNQLNKSYMS TYPE STRING,
DIAGLINES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TCNO_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_TCNO_STR-MANDT sy-vline 
WA_V_TCNO_STR-PROFILE sy-vline 
WA_V_TCNO_STR-KTEXT sy-vline 
WA_V_TCNO_STR-AUTOADJUST sy-vline 
WA_V_TCNO_STR-BUTTONPOS sy-vline 
WA_V_TCNO_STR-DISPBG sy-vline 
WA_V_TCNO_STR-DUPMODE sy-vline 
WA_V_TCNO_STR-HOFFSET sy-vline 
WA_V_TCNO_STR-IGNOREUSER sy-vline 
WA_V_TCNO_STR-INODESIZE sy-vline 
WA_V_TCNO_STR-INSMODE sy-vline 
WA_V_TCNO_STR-LAYBG sy-vline 
WA_V_TCNO_STR-LAYFG sy-vline 
WA_V_TCNO_STR-LAYORDER sy-vline 
WA_V_TCNO_STR-LAYSTYLE sy-vline 
WA_V_TCNO_STR-LBUTTBG sy-vline 
WA_V_TCNO_STR-LBUTTFG sy-vline 
WA_V_TCNO_STR-MARKNODE sy-vline 
WA_V_TCNO_STR-MODMODE sy-vline 
WA_V_TCNO_STR-NAVBG sy-vline 
WA_V_TCNO_STR-NAVFRMCOL sy-vline 
WA_V_TCNO_STR-NODEBG sy-vline 
WA_V_TCNO_STR-NODESIZE sy-vline 
WA_V_TCNO_STR-OBUTTBG sy-vline 
WA_V_TCNO_STR-OBUTTFG sy-vline 
WA_V_TCNO_STR-ORDBG sy-vline 
WA_V_TCNO_STR-ORDFG sy-vline 
WA_V_TCNO_STR-SELLINECOL sy-vline 
WA_V_TCNO_STR-SELOBJMODE sy-vline 
WA_V_TCNO_STR-SELTYPMODE sy-vline 
WA_V_TCNO_STR-TRCKFRMCOL sy-vline 
WA_V_TCNO_STR-VIEW1BG sy-vline 
WA_V_TCNO_STR-VIEW2BG sy-vline 
WA_V_TCNO_STR-VIEW3BG sy-vline 
WA_V_TCNO_STR-VOFFSET sy-vline 
WA_V_TCNO_STR-XPERCENT sy-vline 
WA_V_TCNO_STR-YPERCENT sy-vline 
WA_V_TCNO_STR-ZOOMFAC sy-vline 
WA_V_TCNO_STR-MARKLINK sy-vline 
WA_V_TCNO_STR-CONMODE sy-vline 
WA_V_TCNO_STR-TIMER sy-vline 
WA_V_TCNO_STR-DBLCLICK sy-vline 
WA_V_TCNO_STR-AUTOPORT sy-vline 
WA_V_TCNO_STR-UDM sy-vline 
WA_V_TCNO_STR-ROUNDED sy-vline 
WA_V_TCNO_STR-XPOSITION sy-vline 
WA_V_TCNO_STR-YPOSITION sy-vline 
WA_V_TCNO_STR-XSIZE sy-vline 
WA_V_TCNO_STR-YSIZE sy-vline 
WA_V_TCNO_STR-TRACKOPT sy-vline 
WA_V_TCNO_STR-CLROWS sy-vline 
WA_V_TCNO_STR-CLCOLS sy-vline 
WA_V_TCNO_STR-CLRASTER sy-vline 
WA_V_TCNO_STR-CLCOLWD sy-vline 
WA_V_TCNO_STR-MASTERVIEW sy-vline 
WA_V_TCNO_STR-LEGEND sy-vline 
WA_V_TCNO_STR-SUBCHART sy-vline 
WA_V_TCNO_STR-SUBINDEX sy-vline 
WA_V_TCNO_STR-INFOTEXTS sy-vline 
WA_V_TCNO_STR-TITLEBOX sy-vline 
WA_V_TCNO_STR-PORTSIZE sy-vline 
WA_V_TCNO_STR-AUTO_CLUST sy-vline 
WA_V_TCNO_STR-LAYOUT sy-vline 
WA_V_TCNO_STR-CLDELS sy-vline 
WA_V_TCNO_STR-TBXZOOM sy-vline 
WA_V_TCNO_STR-BREAKCON sy-vline 
WA_V_TCNO_STR-NODELMSG sy-vline 
WA_V_TCNO_STR-INFOTXTNUM sy-vline 
WA_V_TCNO_STR-STGAUGE sy-vline 
WA_V_TCNO_STR-SHORTLINK sy-vline 
WA_V_TCNO_STR-USRPOPS sy-vline 
WA_V_TCNO_STR-LINKINCLUS sy-vline 
WA_V_TCNO_STR-NODUPMOVE sy-vline 
WA_V_TCNO_STR-INNERPICKM sy-vline 
WA_V_TCNO_STR-NOBOXMOVE sy-vline 
WA_V_TCNO_STR-COMPACTNOD sy-vline 
WA_V_TCNO_STR-COMPCTINOD sy-vline 
WA_V_TCNO_STR-TOOLTIP sy-vline 
WA_V_TCNO_STR-BMPDISPAR sy-vline 
WA_V_TCNO_STR-BMPNODEAR sy-vline 
WA_V_TCNO_STR-BMPNAVAR sy-vline 
WA_V_TCNO_STR-UNQLNKSYMS sy-vline 
WA_V_TCNO_STR-DIAGLINES sy-vline      INTO ld_text SEPARATED BY SPACE.

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