ABAP Select data from SAP table V_TCN00 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TCN00 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_TCN00. 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_TCN00 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_TCN00 TYPE STANDARD TABLE OF V_TCN00,
      WA_V_TCN00 TYPE V_TCN00,
      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_TCN00> TYPE V_TCN00.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_TCN00.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_TCN00
  INTO TABLE IT_V_TCN00.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TCN00
*  INTO TABLE @DATA(IT_V_TCN002).
*--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_TCN00 INDEX 1 INTO DATA(WA_V_TCN002).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_TCN00 ASSIGNING <V_TCN00>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TCN00>-MANDT = 1.
<V_TCN00>-SLWID = 1.
<V_TCN00>-KTEXT = 1.
<V_TCN00>-BEROB = 1.
<V_TCN00>-BEROBTXT = 1.

ENDLOOP.

LOOP AT IT_V_TCN00 INTO WA_V_TCN00.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TCN00-SWRT0, sy-vline,
  WA_V_TCN00-SWRT1, sy-vline,
  WA_V_TCN00-SWRT2, sy-vline,
  WA_V_TCN00-SWRT3, sy-vline,
  WA_V_TCN00-SWRT4, sy-vline,
  WA_V_TCN00-SWRT5, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TCN00 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_TCN00 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_TCN00 INTO WA_V_TCN00.


*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_TCN00_STR, 
MANDT TYPE STRING,
SLWID TYPE STRING,
KTEXT TYPE STRING,
BEROB TYPE STRING,
BEROBTXT TYPE STRING,
SWRT0 TYPE STRING,
SWRT1 TYPE STRING,
SWRT2 TYPE STRING,
SWRT3 TYPE STRING,
SWRT4 TYPE STRING,
SWRT5 TYPE STRING,
SWRT6 TYPE STRING,
SWRT7 TYPE STRING,
SWRT8 TYPE STRING,
SWRT9 TYPE STRING,
SWRT10 TYPE STRING,
SWRT11 TYPE STRING,
PAR04 TYPE STRING,
PAR05 TYPE STRING,
EX_USE_IN_PD TYPE STRING,
EX_USE_IN_WBS TYPE STRING,
EX_USE_IN_NACT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TCN00_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_TCN00_STR-MANDT sy-vline 
WA_V_TCN00_STR-SLWID sy-vline 
WA_V_TCN00_STR-KTEXT sy-vline 
WA_V_TCN00_STR-BEROB sy-vline 
WA_V_TCN00_STR-BEROBTXT sy-vline 
WA_V_TCN00_STR-SWRT0 sy-vline 
WA_V_TCN00_STR-SWRT1 sy-vline 
WA_V_TCN00_STR-SWRT2 sy-vline 
WA_V_TCN00_STR-SWRT3 sy-vline 
WA_V_TCN00_STR-SWRT4 sy-vline 
WA_V_TCN00_STR-SWRT5 sy-vline 
WA_V_TCN00_STR-SWRT6 sy-vline 
WA_V_TCN00_STR-SWRT7 sy-vline 
WA_V_TCN00_STR-SWRT8 sy-vline 
WA_V_TCN00_STR-SWRT9 sy-vline 
WA_V_TCN00_STR-SWRT10 sy-vline 
WA_V_TCN00_STR-SWRT11 sy-vline 
WA_V_TCN00_STR-PAR04 sy-vline 
WA_V_TCN00_STR-PAR05 sy-vline 
WA_V_TCN00_STR-EX_USE_IN_PD sy-vline 
WA_V_TCN00_STR-EX_USE_IN_WBS sy-vline 
WA_V_TCN00_STR-EX_USE_IN_NACT sy-vline      INTO ld_text SEPARATED BY SPACE.

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