ABAP Select data from SAP table TWT_ACTION into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TWT_ACTION
*  INTO TABLE @DATA(IT_TWT_ACTION2).
*--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_TWT_ACTION INDEX 1 INTO DATA(WA_TWT_ACTION2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TWT_ACTION>-MANDT = 1.
<TWT_ACTION>-ADDIOPER = 1.
<TWT_ACTION>-ADDIIDOCFB = 1.
<TWT_ACTION>-FRM_CARE = 1.
<TWT_ACTION>-FRM_SIREL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TWT_ACTION-FRM_VWPOS, sy-vline,
  WA_TWT_ACTION-FMCHK_GM, sy-vline,
  WA_TWT_ACTION-FMCHK_PK, sy-vline,
  WA_TWT_ACTION-FMDSP_PK, sy-vline,
  WA_TWT_ACTION-FMEOI_CPO, sy-vline,
  WA_TWT_ACTION-FMGRC_CPO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TWT_ACTION 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_TWT_ACTION 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_TWT_ACTION INTO WA_TWT_ACTION.


*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_TWT_ACTION_STR, 
MANDT TYPE STRING,
ADDIOPER TYPE STRING,
ADDIIDOCFB TYPE STRING,
FRM_CARE TYPE STRING,
FRM_SIREL TYPE STRING,
FRM_VWPOS TYPE STRING,
FMCHK_GM TYPE STRING,
FMCHK_PK TYPE STRING,
FMDSP_PK TYPE STRING,
FMEOI_CPO TYPE STRING,
FMGRC_CPO TYPE STRING,
FMSOR_CPO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TWT_ACTION_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_TWT_ACTION_STR-MANDT sy-vline 
WA_TWT_ACTION_STR-ADDIOPER sy-vline 
WA_TWT_ACTION_STR-ADDIIDOCFB sy-vline 
WA_TWT_ACTION_STR-FRM_CARE sy-vline 
WA_TWT_ACTION_STR-FRM_SIREL sy-vline 
WA_TWT_ACTION_STR-FRM_VWPOS sy-vline 
WA_TWT_ACTION_STR-FMCHK_GM sy-vline 
WA_TWT_ACTION_STR-FMCHK_PK sy-vline 
WA_TWT_ACTION_STR-FMDSP_PK sy-vline 
WA_TWT_ACTION_STR-FMEOI_CPO sy-vline 
WA_TWT_ACTION_STR-FMGRC_CPO sy-vline 
WA_TWT_ACTION_STR-FMSOR_CPO sy-vline      INTO ld_text SEPARATED BY SPACE.

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