ABAP Select data from SAP table T161VN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T161VN 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 T161VN. 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 T161VN 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_T161VN TYPE STANDARD TABLE OF T161VN,
      WA_T161VN TYPE T161VN,
      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: <T161VN> TYPE T161VN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T161VN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T161VN
  INTO TABLE IT_T161VN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T161VN
*  INTO TABLE @DATA(IT_T161VN2).
*--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_T161VN INDEX 1 INTO DATA(WA_T161VN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T161VN ASSIGNING <T161VN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T161VN>-MANDT = 1.
<T161VN>-BSTYP = 1.
<T161VN>-BSART = 1.
<T161VN>-RESWK = 1.
<T161VN>-RESLO = 1.

ENDLOOP.

LOOP AT IT_T161VN INTO WA_T161VN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T161VN-LFART, sy-vline,
  WA_T161VN-PRREG, sy-vline,
  WA_T161VN-LFRET, sy-vline,
  WA_T161VN-LBLFA, sy-vline,
  WA_T161VN-LFRFL, sy-vline,
  WA_T161VN-MEVST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T161VN 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_T161VN 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_T161VN INTO WA_T161VN.


*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_T161VN_STR, 
MANDT TYPE STRING,
BSTYP TYPE STRING,
BSART TYPE STRING,
RESWK TYPE STRING,
RESLO TYPE STRING,
LFART TYPE STRING,
PRREG TYPE STRING,
LFRET TYPE STRING,
LBLFA TYPE STRING,
LFRFL TYPE STRING,
MEVST TYPE STRING,
MERFP TYPE STRING,
LFART1 TYPE STRING,
LFART2 TYPE STRING,
LFCON TYPE STRING,
REVFE TYPE STRING,
REQPRF TYPE STRING,
FLS_LFART TYPE STRING,
ATPCONFMRP TYPE STRING,
ACTIVATE_ADV_PAL_IND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T161VN_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_T161VN_STR-MANDT sy-vline 
WA_T161VN_STR-BSTYP sy-vline 
WA_T161VN_STR-BSART sy-vline 
WA_T161VN_STR-RESWK sy-vline 
WA_T161VN_STR-RESLO sy-vline 
WA_T161VN_STR-LFART sy-vline 
WA_T161VN_STR-PRREG sy-vline 
WA_T161VN_STR-LFRET sy-vline 
WA_T161VN_STR-LBLFA sy-vline 
WA_T161VN_STR-LFRFL sy-vline 
WA_T161VN_STR-MEVST sy-vline 
WA_T161VN_STR-MERFP sy-vline 
WA_T161VN_STR-LFART1 sy-vline 
WA_T161VN_STR-LFART2 sy-vline 
WA_T161VN_STR-LFCON sy-vline 
WA_T161VN_STR-REVFE sy-vline 
WA_T161VN_STR-REQPRF sy-vline 
WA_T161VN_STR-FLS_LFART sy-vline 
WA_T161VN_STR-ATPCONFMRP sy-vline 
WA_T161VN_STR-ACTIVATE_ADV_PAL_IND sy-vline      INTO ld_text SEPARATED BY SPACE.

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