ABAP Select data from SAP table TWPIS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TWPIS
*  INTO TABLE @DATA(IT_TWPIS2).
*--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_TWPIS INDEX 1 INTO DATA(WA_TWPIS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TWPIS>-MANDT = 1.
<TWPIS>-INPRO = 1.
<TWPIS>-FBEST = 1.
<TWPIS>-FFAKT = 1.
<TWPIS>-FFIBU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TWPIS-FREPL, sy-vline,
  WA_TWPIS-ANDEB, sy-vline,
  WA_TWPIS-CPDDE, sy-vline,
  WA_TWPIS-AUART, sy-vline,
  WA_TWPIS-KALSM, sy-vline,
  WA_TWPIS-KSCHL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TWPIS 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_TWPIS 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_TWPIS INTO WA_TWPIS.


*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 ANDEB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TWPIS-ANDEB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TWPIS-ANDEB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CPDDE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TWPIS-CPDDE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TWPIS-CPDDE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AUART, internal->external for field AUART
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_TWPIS-AUART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TWPIS-AUART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AUART, internal->external for field KAUAR
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_TWPIS-KAUAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TWPIS-KAUAR.
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_TWPIS_STR, 
MANDT TYPE STRING,
INPRO TYPE STRING,
FBEST TYPE STRING,
FFAKT TYPE STRING,
FFIBU TYPE STRING,
FREPL TYPE STRING,
ANDEB TYPE STRING,
CPDDE TYPE STRING,
AUART TYPE STRING,
KALSM TYPE STRING,
KSCHL TYPE STRING,
PSTYV TYPE STRING,
WPSTY TYPE STRING,
FKARA TYPE STRING,
KAUAR TYPE STRING,
KKALS TYPE STRING,
KKSCH TYPE STRING,
KPSTY TYPE STRING,
KFKAR TYPE STRING,
LGORT TYPE STRING,
ISTVK TYPE STRING,
BTYPV TYPE STRING,
DEFLFART TYPE STRING,
MEFIND TYPE STRING,
WARNLEVEL TYPE STRING,
DEFBA TYPE STRING,
SUBSTNB TYPE STRING,
SUBSTUB TYPE STRING,
FSTAT TYPE STRING,
GPONZU TYPE STRING,
FSTATBW TYPE STRING,
FSTATRISBW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TWPIS_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_TWPIS_STR-MANDT sy-vline 
WA_TWPIS_STR-INPRO sy-vline 
WA_TWPIS_STR-FBEST sy-vline 
WA_TWPIS_STR-FFAKT sy-vline 
WA_TWPIS_STR-FFIBU sy-vline 
WA_TWPIS_STR-FREPL sy-vline 
WA_TWPIS_STR-ANDEB sy-vline 
WA_TWPIS_STR-CPDDE sy-vline 
WA_TWPIS_STR-AUART sy-vline 
WA_TWPIS_STR-KALSM sy-vline 
WA_TWPIS_STR-KSCHL sy-vline 
WA_TWPIS_STR-PSTYV sy-vline 
WA_TWPIS_STR-WPSTY sy-vline 
WA_TWPIS_STR-FKARA sy-vline 
WA_TWPIS_STR-KAUAR sy-vline 
WA_TWPIS_STR-KKALS sy-vline 
WA_TWPIS_STR-KKSCH sy-vline 
WA_TWPIS_STR-KPSTY sy-vline 
WA_TWPIS_STR-KFKAR sy-vline 
WA_TWPIS_STR-LGORT sy-vline 
WA_TWPIS_STR-ISTVK sy-vline 
WA_TWPIS_STR-BTYPV sy-vline 
WA_TWPIS_STR-DEFLFART sy-vline 
WA_TWPIS_STR-MEFIND sy-vline 
WA_TWPIS_STR-WARNLEVEL sy-vline 
WA_TWPIS_STR-DEFBA sy-vline 
WA_TWPIS_STR-SUBSTNB sy-vline 
WA_TWPIS_STR-SUBSTUB sy-vline 
WA_TWPIS_STR-FSTAT sy-vline 
WA_TWPIS_STR-GPONZU sy-vline 
WA_TWPIS_STR-FSTATBW sy-vline 
WA_TWPIS_STR-FSTATRISBW sy-vline      INTO ld_text SEPARATED BY SPACE.

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