ABAP Select data from SAP table V_TNA30A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TNA30A 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_TNA30A. 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_TNA30A 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_TNA30A TYPE STANDARD TABLE OF V_TNA30A,
      WA_V_TNA30A TYPE V_TNA30A,
      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_TNA30A> TYPE V_TNA30A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_TNA30A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_TNA30A
  INTO TABLE IT_V_TNA30A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TNA30A
*  INTO TABLE @DATA(IT_V_TNA30A2).
*--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_TNA30A INDEX 1 INTO DATA(WA_V_TNA30A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_TNA30A ASSIGNING <V_TNA30A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TNA30A>-MANDT = 1.
<V_TNA30A>-EINRI = 1.
<V_TNA30A>-SELID = 1.
<V_TNA30A>-KTEXT = 1.
<V_TNA30A>-SYBAK = 1.

ENDLOOP.

LOOP AT IT_V_TNA30A INTO WA_V_TNA30A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TNA30A-SYBSK, sy-vline,
  WA_V_TNA30A-TABAK, sy-vline,
  WA_V_TNA30A-TABSK, sy-vline,
  WA_V_TNA30A-TARIF, sy-vline,
  WA_V_TNA30A-TALST, sy-vline,
  WA_V_TNA30A-BFORP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TNA30A 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_TNA30A 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_TNA30A INTO WA_V_TNA30A.


*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 ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TNA30A-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNA30A-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TARIF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TNA30A-TARIF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNA30A-TARIF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TALST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TNA30A-TALST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNA30A-TALST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BFORP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TNA30A-BFORP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNA30A-BFORP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BFORB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TNA30A-BFORB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNA30A-BFORB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VTRTY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TNA30A-VTRTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNA30A-VTRTY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BTARI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TNA30A-BTARI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNA30A-BTARI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BTALS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TNA30A-BTALS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TNA30A-BTALS.
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_TNA30A_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
SELID TYPE STRING,
KTEXT TYPE STRING,
SYBAK TYPE STRING,
SYBSK TYPE STRING,
TABAK TYPE STRING,
TABSK TYPE STRING,
TARIF TYPE STRING,
TALST TYPE STRING,
BFORP TYPE STRING,
BFORB TYPE STRING,
VTRTY TYPE STRING,
EINKB TYPE STRING,
KTXT1 TYPE STRING,
KATTX TYPE STRING,
VTEXT TYPE STRING,
BTARI TYPE STRING,
BTALS TYPE STRING,
FORAK TYPE STRING,
BKTXT TYPE STRING,
BKATX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TNA30A_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_TNA30A_STR-MANDT sy-vline 
WA_V_TNA30A_STR-EINRI sy-vline 
WA_V_TNA30A_STR-SELID sy-vline 
WA_V_TNA30A_STR-KTEXT sy-vline 
WA_V_TNA30A_STR-SYBAK sy-vline 
WA_V_TNA30A_STR-SYBSK sy-vline 
WA_V_TNA30A_STR-TABAK sy-vline 
WA_V_TNA30A_STR-TABSK sy-vline 
WA_V_TNA30A_STR-TARIF sy-vline 
WA_V_TNA30A_STR-TALST sy-vline 
WA_V_TNA30A_STR-BFORP sy-vline 
WA_V_TNA30A_STR-BFORB sy-vline 
WA_V_TNA30A_STR-VTRTY sy-vline 
WA_V_TNA30A_STR-EINKB sy-vline 
WA_V_TNA30A_STR-KTXT1 sy-vline 
WA_V_TNA30A_STR-KATTX sy-vline 
WA_V_TNA30A_STR-VTEXT sy-vline 
WA_V_TNA30A_STR-BTARI sy-vline 
WA_V_TNA30A_STR-BTALS sy-vline 
WA_V_TNA30A_STR-FORAK sy-vline 
WA_V_TNA30A_STR-BKTXT sy-vline 
WA_V_TNA30A_STR-BKATX sy-vline      INTO ld_text SEPARATED BY SPACE.

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