ABAP Select data from SAP table V_TNAD2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TNAD2 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_TNAD2. 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_TNAD2 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_TNAD2 TYPE STANDARD TABLE OF V_TNAD2,
      WA_V_TNAD2 TYPE V_TNAD2,
      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_TNAD2> TYPE V_TNAD2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_TNAD2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_TNAD2
  INTO TABLE IT_V_TNAD2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TNAD2
*  INTO TABLE @DATA(IT_V_TNAD22).
*--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_TNAD2 INDEX 1 INTO DATA(WA_V_TNAD22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_TNAD2 ASSIGNING <V_TNAD2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TNAD2>-MANDT = 1.
<V_TNAD2>-KAPPL = 1.
<V_TNAD2>-KSCHL = 1.
<V_TNAD2>-VKORG = 1.
<V_TNAD2>-VTWEG = 1.

ENDLOOP.

LOOP AT IT_V_TNAD2 INTO WA_V_TNAD2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TNAD2-SPART, sy-vline,
  WA_V_TNAD2-LDEST, sy-vline,
  WA_V_TNAD2-DSNAM, sy-vline,
  WA_V_TNAD2-DSUF1, sy-vline,
  WA_V_TNAD2-DSUF2, sy-vline,
  WA_V_TNAD2-DIMME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TNAD2 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_TNAD2 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_TNAD2 INTO WA_V_TNAD2.


*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 SPDEV, internal->external for field LDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_V_TNAD2-LDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNAD2-LDEST.
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_V_TNAD2_STR, 
MANDT TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
LDEST TYPE STRING,
DSNAM TYPE STRING,
DSUF1 TYPE STRING,
DSUF2 TYPE STRING,
DIMME TYPE STRING,
DELET TYPE STRING,
TDRECEIVER TYPE STRING,
TDDIVISION TYPE STRING,
TDOCOVER TYPE STRING,
TDCOVTITLE TYPE STRING,
TDAUTORITY TYPE STRING,
PASTANDORT TYPE STRING,
VKO_TXT TYPE STRING,
VTW_TXT TYPE STRING,
SPA_TXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TNAD2_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_TNAD2_STR-MANDT sy-vline 
WA_V_TNAD2_STR-KAPPL sy-vline 
WA_V_TNAD2_STR-KSCHL sy-vline 
WA_V_TNAD2_STR-VKORG sy-vline 
WA_V_TNAD2_STR-VTWEG sy-vline 
WA_V_TNAD2_STR-SPART sy-vline 
WA_V_TNAD2_STR-LDEST sy-vline 
WA_V_TNAD2_STR-DSNAM sy-vline 
WA_V_TNAD2_STR-DSUF1 sy-vline 
WA_V_TNAD2_STR-DSUF2 sy-vline 
WA_V_TNAD2_STR-DIMME sy-vline 
WA_V_TNAD2_STR-DELET sy-vline 
WA_V_TNAD2_STR-TDRECEIVER sy-vline 
WA_V_TNAD2_STR-TDDIVISION sy-vline 
WA_V_TNAD2_STR-TDOCOVER sy-vline 
WA_V_TNAD2_STR-TDCOVTITLE sy-vline 
WA_V_TNAD2_STR-TDAUTORITY sy-vline 
WA_V_TNAD2_STR-PASTANDORT sy-vline 
WA_V_TNAD2_STR-VKO_TXT sy-vline 
WA_V_TNAD2_STR-VTW_TXT sy-vline 
WA_V_TNAD2_STR-SPA_TXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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