ABAP Select data from SAP table BWSEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BWSEL
*  INTO TABLE @DATA(IT_BWSEL2).
*--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_BWSEL INDEX 1 INTO DATA(WA_BWSEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BWSEL>-PERNR = 1.
<BWSEL>-BEWID = 1.
<BWSEL>-BTIME = 1.
<BWSEL>-BEGDA = 1.
<BWSEL>-ENDDA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BWSEL-ABRDT, sy-vline,
  WA_BWSEL-ABBEG, sy-vline,
  WA_BWSEL-AWART, sy-vline,
  WA_BWSEL-TARIF, sy-vline,
  WA_BWSEL-WAERS, sy-vline,
  WA_BWSEL-DZUBT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BWSEL 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_BWSEL 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_BWSEL INTO WA_BWSEL.


*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 SPDEV, internal->external for field PDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_BWSEL-PDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BWSEL-PDEST.
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_BWSEL_STR, 
PERNR TYPE STRING,
BEWID TYPE STRING,
BTIME TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
ABRDT TYPE STRING,
ABBEG TYPE STRING,
AWART TYPE STRING,
TARIF TYPE STRING,
WAERS TYPE STRING,
DZUBT TYPE STRING,
BLEAV TYPE STRING,
PDEST TYPE STRING,
MTREE TYPE STRING,
MTRGN TYPE STRING,
KEYDT TYPE STRING,
DATE1 TYPE STRING,
DATE2 TYPE STRING,
DATE3 TYPE STRING,
DATE4 TYPE STRING,
DATE5 TYPE STRING,
DATE6 TYPE STRING,
ARBCR TYPE STRING,
NSPOO TYPE STRING,
ATZRE TYPE STRING,
PROTO TYPE STRING,
MOLGA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BWSEL_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_BWSEL_STR-PERNR sy-vline 
WA_BWSEL_STR-BEWID sy-vline 
WA_BWSEL_STR-BTIME sy-vline 
WA_BWSEL_STR-BEGDA sy-vline 
WA_BWSEL_STR-ENDDA sy-vline 
WA_BWSEL_STR-ABRDT sy-vline 
WA_BWSEL_STR-ABBEG sy-vline 
WA_BWSEL_STR-AWART sy-vline 
WA_BWSEL_STR-TARIF sy-vline 
WA_BWSEL_STR-WAERS sy-vline 
WA_BWSEL_STR-DZUBT sy-vline 
WA_BWSEL_STR-BLEAV sy-vline 
WA_BWSEL_STR-PDEST sy-vline 
WA_BWSEL_STR-MTREE sy-vline 
WA_BWSEL_STR-MTRGN sy-vline 
WA_BWSEL_STR-KEYDT sy-vline 
WA_BWSEL_STR-DATE1 sy-vline 
WA_BWSEL_STR-DATE2 sy-vline 
WA_BWSEL_STR-DATE3 sy-vline 
WA_BWSEL_STR-DATE4 sy-vline 
WA_BWSEL_STR-DATE5 sy-vline 
WA_BWSEL_STR-DATE6 sy-vline 
WA_BWSEL_STR-ARBCR sy-vline 
WA_BWSEL_STR-NSPOO sy-vline 
WA_BWSEL_STR-ATZRE sy-vline 
WA_BWSEL_STR-PROTO sy-vline 
WA_BWSEL_STR-MOLGA sy-vline      INTO ld_text SEPARATED BY SPACE.

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