ABAP Select data from SAP table V_TWTCTRL4 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TWTCTRL4 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_TWTCTRL4. 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_TWTCTRL4 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_TWTCTRL4 TYPE STANDARD TABLE OF V_TWTCTRL4,
      WA_V_TWTCTRL4 TYPE V_TWTCTRL4,
      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_TWTCTRL4> TYPE V_TWTCTRL4.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_TWTCTRL4.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_TWTCTRL4
  INTO TABLE IT_V_TWTCTRL4.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TWTCTRL4
*  INTO TABLE @DATA(IT_V_TWTCTRL42).
*--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_TWTCTRL4 INDEX 1 INTO DATA(WA_V_TWTCTRL42).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_TWTCTRL4 ASSIGNING <V_TWTCTRL4>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TWTCTRL4>-MANDT = 1.
<V_TWTCTRL4>-ADDIFM = 1.
<V_TWTCTRL4>-ADDIAPPL = 1.
<V_TWTCTRL4>-ADDIEVENT = 1.
<V_TWTCTRL4>-LFDNUM = 1.

ENDLOOP.

LOOP AT IT_V_TWTCTRL4 INTO WA_V_TWTCTRL4.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TWTCTRL4-ADDIFMTXT, sy-vline,
  WA_V_TWTCTRL4-AUART, sy-vline,
  WA_V_TWTCTRL4-BEZEI, sy-vline,
  WA_V_TWTCTRL4-KLART, sy-vline,
  WA_V_TWTCTRL4-CLASS, sy-vline,
  WA_V_TWTCTRL4-ADDIOPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TWTCTRL4 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_TWTCTRL4 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_TWTCTRL4 INTO WA_V_TWTCTRL4.


*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 AUART, internal->external for field AUART
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_V_TWTCTRL4-AUART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_TWTCTRL4-AUART.
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_TWTCTRL4_STR, 
MANDT TYPE STRING,
ADDIFM TYPE STRING,
ADDIAPPL TYPE STRING,
ADDIEVENT TYPE STRING,
LFDNUM TYPE STRING,
ADDIFMTXT TYPE STRING,
AUART TYPE STRING,
BEZEI TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
ADDIOPER TYPE STRING,
ADDISCLNT TYPE STRING,
ADDICUFMCHK TYPE STRING,
VBTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TWTCTRL4_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_TWTCTRL4_STR-MANDT sy-vline 
WA_V_TWTCTRL4_STR-ADDIFM sy-vline 
WA_V_TWTCTRL4_STR-ADDIAPPL sy-vline 
WA_V_TWTCTRL4_STR-ADDIEVENT sy-vline 
WA_V_TWTCTRL4_STR-LFDNUM sy-vline 
WA_V_TWTCTRL4_STR-ADDIFMTXT sy-vline 
WA_V_TWTCTRL4_STR-AUART sy-vline 
WA_V_TWTCTRL4_STR-BEZEI sy-vline 
WA_V_TWTCTRL4_STR-KLART sy-vline 
WA_V_TWTCTRL4_STR-CLASS sy-vline 
WA_V_TWTCTRL4_STR-ADDIOPER sy-vline 
WA_V_TWTCTRL4_STR-ADDISCLNT sy-vline 
WA_V_TWTCTRL4_STR-ADDICUFMCHK sy-vline 
WA_V_TWTCTRL4_STR-VBTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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