ABAP Select data from SAP table TWSSO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TWSSO
*  INTO TABLE @DATA(IT_TWSSO2).
*--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_TWSSO INDEX 1 INTO DATA(WA_TWSSO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TWSSO>-MANDT = 1.
<TWSSO>-SSOPT_PRO = 1.
<TWSSO>-PUR_PRICE = 1.
<TWSSO>-CALC_USE = 1.
<TWSSO>-RET_PRICE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TWSSO-TURN_READ, sy-vline,
  WA_TWSSO-SELV_TURN, sy-vline,
  WA_TWSSO-FLD_TURNV, sy-vline,
  WA_TWSSO-FLD_TURNQ, sy-vline,
  WA_TWSSO-PERIOD_NUM, sy-vline,
  WA_TWSSO-STOC_READ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TWSSO 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_TWSSO 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_TWSSO INTO WA_TWSSO.


*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_TWSSO_STR, 
MANDT TYPE STRING,
SSOPT_PRO TYPE STRING,
PUR_PRICE TYPE STRING,
CALC_USE TYPE STRING,
RET_PRICE TYPE STRING,
TURN_READ TYPE STRING,
SELV_TURN TYPE STRING,
FLD_TURNV TYPE STRING,
FLD_TURNQ TYPE STRING,
PERIOD_NUM TYPE STRING,
STOC_READ TYPE STRING,
SELV_STOC TYPE STRING,
FLD_STOCQ TYPE STRING,
FUNCNAME TYPE STRING,
RST_FUNC TYPE STRING,
BW_READ TYPE STRING,
TURNMETH TYPE STRING,
TURNSTEP TYPE STRING,
AAFLD_TURNV TYPE STRING,
AAFLD_TURNQ TYPE STRING,
STOCMETH TYPE STRING,
STOCSTEP TYPE STRING,
AAFLD_STOCQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TWSSO_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_TWSSO_STR-MANDT sy-vline 
WA_TWSSO_STR-SSOPT_PRO sy-vline 
WA_TWSSO_STR-PUR_PRICE sy-vline 
WA_TWSSO_STR-CALC_USE sy-vline 
WA_TWSSO_STR-RET_PRICE sy-vline 
WA_TWSSO_STR-TURN_READ sy-vline 
WA_TWSSO_STR-SELV_TURN sy-vline 
WA_TWSSO_STR-FLD_TURNV sy-vline 
WA_TWSSO_STR-FLD_TURNQ sy-vline 
WA_TWSSO_STR-PERIOD_NUM sy-vline 
WA_TWSSO_STR-STOC_READ sy-vline 
WA_TWSSO_STR-SELV_STOC sy-vline 
WA_TWSSO_STR-FLD_STOCQ sy-vline 
WA_TWSSO_STR-FUNCNAME sy-vline 
WA_TWSSO_STR-RST_FUNC sy-vline 
WA_TWSSO_STR-BW_READ sy-vline 
WA_TWSSO_STR-TURNMETH sy-vline 
WA_TWSSO_STR-TURNSTEP sy-vline 
WA_TWSSO_STR-AAFLD_TURNV sy-vline 
WA_TWSSO_STR-AAFLD_TURNQ sy-vline 
WA_TWSSO_STR-STOCMETH sy-vline 
WA_TWSSO_STR-STOCSTEP sy-vline 
WA_TWSSO_STR-AAFLD_STOCQ sy-vline      INTO ld_text SEPARATED BY SPACE.

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