ABAP Select data from SAP table V_TWAA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TWAA 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_TWAA. 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_TWAA 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_TWAA TYPE STANDARD TABLE OF V_TWAA,
      WA_V_TWAA TYPE V_TWAA,
      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_TWAA> TYPE V_TWAA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TWAA
*  INTO TABLE @DATA(IT_V_TWAA2).
*--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_TWAA INDEX 1 INTO DATA(WA_V_TWAA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TWAA>-MANDT = 1.
<V_TWAA>-AKART = 1.
<V_TWAA>-ARTTX = 1.
<V_TWAA>-AKTYP = 1.
<V_TWAA>-EKKON = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TWAA-VKKON, sy-vline,
  WA_V_TWAA-VKONB, sy-vline,
  WA_V_TWAA-VKONE, sy-vline,
  WA_V_TWAA-VLISB, sy-vline,
  WA_V_TWAA-VLISE, sy-vline,
  WA_V_TWAA-VBEKB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TWAA 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_TWAA 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_TWAA INTO WA_V_TWAA.


*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 SPKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_TWAA-SPKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TWAA-SPKNR.
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_TWAA_STR, 
MANDT TYPE STRING,
AKART TYPE STRING,
ARTTX TYPE STRING,
AKTYP TYPE STRING,
EKKON TYPE STRING,
VKKON TYPE STRING,
VKONB TYPE STRING,
VKONE TYPE STRING,
VLISB TYPE STRING,
VLISE TYPE STRING,
VBEKB TYPE STRING,
VWEFI TYPE STRING,
NUMKI TYPE STRING,
NUMKE TYPE STRING,
KOBOG TYPE STRING,
KOPGR TYPE STRING,
FELDK TYPE STRING,
AUFAR TYPE STRING,
BEKTY TYPE STRING,
KAPPL TYPE STRING,
KSBEK TYPE STRING,
KOBVK TYPE STRING,
SPVKO TYPE STRING,
VTEXT TYPE STRING,
SPVTW TYPE STRING,
VTEXT1 TYPE STRING,
SPKNR TYPE STRING,
NAME1 TYPE STRING,
LIGRU TYPE STRING,
KALKE TYPE STRING,
VZKON TYPE STRING,
LIVAR TYPE STRING,
EKERV TYPE STRING,
KSCHL_PERC TYPE STRING,
KSCHL_VAL TYPE STRING,
NO_KALK TYPE STRING,
LCHECK TYPE STRING,
SPPLT TYPE STRING,
FIELDCAT TYPE STRING,
MEDIA_TYPE TYPE STRING,
CUSTOMER_TYPE TYPE STRING,
WAELA TYPE STRING,
FORMTYPE TYPE STRING,
ALLOW_PMAT_IGNO TYPE STRING,
DUELI TYPE STRING,
DUEPP TYPE STRING,
DUESP TYPE STRING,
ODUSP TYPE STRING,
DUEAL TYPE STRING,
ODUAL TYPE STRING,
ODUAN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TWAA_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_TWAA_STR-MANDT sy-vline 
WA_V_TWAA_STR-AKART sy-vline 
WA_V_TWAA_STR-ARTTX sy-vline 
WA_V_TWAA_STR-AKTYP sy-vline 
WA_V_TWAA_STR-EKKON sy-vline 
WA_V_TWAA_STR-VKKON sy-vline 
WA_V_TWAA_STR-VKONB sy-vline 
WA_V_TWAA_STR-VKONE sy-vline 
WA_V_TWAA_STR-VLISB sy-vline 
WA_V_TWAA_STR-VLISE sy-vline 
WA_V_TWAA_STR-VBEKB sy-vline 
WA_V_TWAA_STR-VWEFI sy-vline 
WA_V_TWAA_STR-NUMKI sy-vline 
WA_V_TWAA_STR-NUMKE sy-vline 
WA_V_TWAA_STR-KOBOG sy-vline 
WA_V_TWAA_STR-KOPGR sy-vline 
WA_V_TWAA_STR-FELDK sy-vline 
WA_V_TWAA_STR-AUFAR sy-vline 
WA_V_TWAA_STR-BEKTY sy-vline 
WA_V_TWAA_STR-KAPPL sy-vline 
WA_V_TWAA_STR-KSBEK sy-vline 
WA_V_TWAA_STR-KOBVK sy-vline 
WA_V_TWAA_STR-SPVKO sy-vline 
WA_V_TWAA_STR-VTEXT sy-vline 
WA_V_TWAA_STR-SPVTW sy-vline 
WA_V_TWAA_STR-VTEXT1 sy-vline 
WA_V_TWAA_STR-SPKNR sy-vline 
WA_V_TWAA_STR-NAME1 sy-vline 
WA_V_TWAA_STR-LIGRU sy-vline 
WA_V_TWAA_STR-KALKE sy-vline 
WA_V_TWAA_STR-VZKON sy-vline 
WA_V_TWAA_STR-LIVAR sy-vline 
WA_V_TWAA_STR-EKERV sy-vline 
WA_V_TWAA_STR-KSCHL_PERC sy-vline 
WA_V_TWAA_STR-KSCHL_VAL sy-vline 
WA_V_TWAA_STR-NO_KALK sy-vline 
WA_V_TWAA_STR-LCHECK sy-vline 
WA_V_TWAA_STR-SPPLT sy-vline 
WA_V_TWAA_STR-FIELDCAT sy-vline 
WA_V_TWAA_STR-MEDIA_TYPE sy-vline 
WA_V_TWAA_STR-CUSTOMER_TYPE sy-vline 
WA_V_TWAA_STR-WAELA sy-vline 
WA_V_TWAA_STR-FORMTYPE sy-vline 
WA_V_TWAA_STR-ALLOW_PMAT_IGNO sy-vline 
WA_V_TWAA_STR-DUELI sy-vline 
WA_V_TWAA_STR-DUEPP sy-vline 
WA_V_TWAA_STR-DUESP sy-vline 
WA_V_TWAA_STR-ODUSP sy-vline 
WA_V_TWAA_STR-DUEAL sy-vline 
WA_V_TWAA_STR-ODUAL sy-vline 
WA_V_TWAA_STR-ODUAN sy-vline      INTO ld_text SEPARATED BY SPACE.

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