ABAP Select data from SAP table TWTCTRL into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TWTCTRL 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 TWTCTRL. 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 TWTCTRL 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_TWTCTRL TYPE STANDARD TABLE OF TWTCTRL,
      WA_TWTCTRL TYPE TWTCTRL,
      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: <TWTCTRL> TYPE TWTCTRL.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TWTCTRL
*  INTO TABLE @DATA(IT_TWTCTRL2).
*--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_TWTCTRL INDEX 1 INTO DATA(WA_TWTCTRL2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TWTCTRL-ADDISUPFMCHK, sy-vline,
  WA_TWTCTRL-BSTYP, sy-vline,
  WA_TWTCTRL-BSART, sy-vline,
  WA_TWTCTRL-ADDIAPPLPO, sy-vline,
  WA_TWTCTRL-RETPO, sy-vline,
  WA_TWTCTRL-CVBFIELD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TWTCTRL 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_TWTCTRL 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_TWTCTRL INTO WA_TWTCTRL.


*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_TWTCTRL-AUART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TWTCTRL-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_TWTCTRL_STR, 
MANDT TYPE STRING,
ADDIFM TYPE STRING,
ADDIAPPL TYPE STRING,
ADDIEVENT TYPE STRING,
LFDNUM TYPE STRING,
ADDISUPFMCHK TYPE STRING,
BSTYP TYPE STRING,
BSART TYPE STRING,
ADDIAPPLPO TYPE STRING,
RETPO TYPE STRING,
CVBFIELD TYPE STRING,
ADDIAPPLGM TYPE STRING,
BWART TYPE STRING,
LFART TYPE STRING,
ADDIAPPLLI TYPE STRING,
ADDICUFMCHK TYPE STRING,
AUART TYPE STRING,
VBTYP TYPE STRING,
ADDIAPPLSO TYPE STRING,
AKART TYPE STRING,
ADDISCLNT TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
ADDIOPER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TWTCTRL_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_TWTCTRL_STR-MANDT sy-vline 
WA_TWTCTRL_STR-ADDIFM sy-vline 
WA_TWTCTRL_STR-ADDIAPPL sy-vline 
WA_TWTCTRL_STR-ADDIEVENT sy-vline 
WA_TWTCTRL_STR-LFDNUM sy-vline 
WA_TWTCTRL_STR-ADDISUPFMCHK sy-vline 
WA_TWTCTRL_STR-BSTYP sy-vline 
WA_TWTCTRL_STR-BSART sy-vline 
WA_TWTCTRL_STR-ADDIAPPLPO sy-vline 
WA_TWTCTRL_STR-RETPO sy-vline 
WA_TWTCTRL_STR-CVBFIELD sy-vline 
WA_TWTCTRL_STR-ADDIAPPLGM sy-vline 
WA_TWTCTRL_STR-BWART sy-vline 
WA_TWTCTRL_STR-LFART sy-vline 
WA_TWTCTRL_STR-ADDIAPPLLI sy-vline 
WA_TWTCTRL_STR-ADDICUFMCHK sy-vline 
WA_TWTCTRL_STR-AUART sy-vline 
WA_TWTCTRL_STR-VBTYP sy-vline 
WA_TWTCTRL_STR-ADDIAPPLSO sy-vline 
WA_TWTCTRL_STR-AKART sy-vline 
WA_TWTCTRL_STR-ADDISCLNT sy-vline 
WA_TWTCTRL_STR-KLART sy-vline 
WA_TWTCTRL_STR-CLASS sy-vline 
WA_TWTCTRL_STR-ADDIOPER sy-vline      INTO ld_text SEPARATED BY SPACE.

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