ABAP Select data from SAP table BASW_SWITCHING_LIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BASW_SWITCHING_LIST
*  INTO TABLE @DATA(IT_BASW_SWITCHING_LIST2).
*--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_BASW_SWITCHING_LIST INDEX 1 INTO DATA(WA_BASW_SWITCHING_LIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BASW_SWITCHING_LIST>-SWITCH_NO = 1.
<BASW_SWITCHING_LIST>-RTCUR = 1.
<BASW_SWITCHING_LIST>-FGRUP_FR = 1.
<BASW_SWITCHING_LIST>-FGRUP_FR_TEXT = 1.
<BASW_SWITCHING_LIST>-FGRUP_TO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BASW_SWITCHING_LIST-FGRUP_TO_TEXT, sy-vline,
  WA_BASW_SWITCHING_LIST-RCNTR_FR, sy-vline,
  WA_BASW_SWITCHING_LIST-RCNTR_TO, sy-vline,
  WA_BASW_SWITCHING_LIST-PROJN_FR, sy-vline,
  WA_BASW_SWITCHING_LIST-PROJN_TO, sy-vline,
  WA_BASW_SWITCHING_LIST-ORDNR_FR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BASW_SWITCHING_LIST 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_BASW_SWITCHING_LIST 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_BASW_SWITCHING_LIST INTO WA_BASW_SWITCHING_LIST.


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

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

*Conversion exit ABPSP, internal->external for field PROJN_FR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_BASW_SWITCHING_LIST-PROJN_FR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BASW_SWITCHING_LIST-PROJN_FR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PROJN_TO
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_BASW_SWITCHING_LIST-PROJN_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BASW_SWITCHING_LIST-PROJN_TO.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit NUMCV, internal->external for field VORNR_FR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_BASW_SWITCHING_LIST-VORNR_FR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BASW_SWITCHING_LIST-VORNR_FR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORNR_TO
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_BASW_SWITCHING_LIST-VORNR_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BASW_SWITCHING_LIST-VORNR_TO.
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_BASW_SWITCHING_LIST_STR, 
SWITCH_NO TYPE STRING,
RTCUR TYPE STRING,
FGRUP_FR TYPE STRING,
FGRUP_FR_TEXT TYPE STRING,
FGRUP_TO TYPE STRING,
FGRUP_TO_TEXT TYPE STRING,
RCNTR_FR TYPE STRING,
RCNTR_TO TYPE STRING,
PROJN_FR TYPE STRING,
PROJN_TO TYPE STRING,
ORDNR_FR TYPE STRING,
ORDNR_TO TYPE STRING,
NPLNR_FR TYPE STRING,
NPLNR_TO TYPE STRING,
AUFPL_FR TYPE STRING,
AUFPL_TO TYPE STRING,
APLZL_FR TYPE STRING,
APLZL_TO TYPE STRING,
VORNR_FR TYPE STRING,
VORNR_TO TYPE STRING,
CATEGORY TYPE STRING,
VALUT TYPE STRING,
BLDAT TYPE STRING,
INTEREST_INCURRED_DAYS TYPE STRING,
TSL_C TYPE STRING,
HSL_C TYPE STRING,
LC2_C TYPE STRING,
LC3_C TYPE STRING,
TSL_NC TYPE STRING,
HSL_NC TYPE STRING,
LC2_NC TYPE STRING,
LC3_NC TYPE STRING,
TSL_I TYPE STRING,
HSL_I TYPE STRING,
LC2_I TYPE STRING,
LC3_I TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BASW_SWITCHING_LIST_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_BASW_SWITCHING_LIST_STR-SWITCH_NO sy-vline 
WA_BASW_SWITCHING_LIST_STR-RTCUR sy-vline 
WA_BASW_SWITCHING_LIST_STR-FGRUP_FR sy-vline 
WA_BASW_SWITCHING_LIST_STR-FGRUP_FR_TEXT sy-vline 
WA_BASW_SWITCHING_LIST_STR-FGRUP_TO sy-vline 
WA_BASW_SWITCHING_LIST_STR-FGRUP_TO_TEXT sy-vline 
WA_BASW_SWITCHING_LIST_STR-RCNTR_FR sy-vline 
WA_BASW_SWITCHING_LIST_STR-RCNTR_TO sy-vline 
WA_BASW_SWITCHING_LIST_STR-PROJN_FR sy-vline 
WA_BASW_SWITCHING_LIST_STR-PROJN_TO sy-vline 
WA_BASW_SWITCHING_LIST_STR-ORDNR_FR sy-vline 
WA_BASW_SWITCHING_LIST_STR-ORDNR_TO sy-vline 
WA_BASW_SWITCHING_LIST_STR-NPLNR_FR sy-vline 
WA_BASW_SWITCHING_LIST_STR-NPLNR_TO sy-vline 
WA_BASW_SWITCHING_LIST_STR-AUFPL_FR sy-vline 
WA_BASW_SWITCHING_LIST_STR-AUFPL_TO sy-vline 
WA_BASW_SWITCHING_LIST_STR-APLZL_FR sy-vline 
WA_BASW_SWITCHING_LIST_STR-APLZL_TO sy-vline 
WA_BASW_SWITCHING_LIST_STR-VORNR_FR sy-vline 
WA_BASW_SWITCHING_LIST_STR-VORNR_TO sy-vline 
WA_BASW_SWITCHING_LIST_STR-CATEGORY sy-vline 
WA_BASW_SWITCHING_LIST_STR-VALUT sy-vline 
WA_BASW_SWITCHING_LIST_STR-BLDAT sy-vline 
WA_BASW_SWITCHING_LIST_STR-INTEREST_INCURRED_DAYS sy-vline 
WA_BASW_SWITCHING_LIST_STR-TSL_C sy-vline 
WA_BASW_SWITCHING_LIST_STR-HSL_C sy-vline 
WA_BASW_SWITCHING_LIST_STR-LC2_C sy-vline 
WA_BASW_SWITCHING_LIST_STR-LC3_C sy-vline 
WA_BASW_SWITCHING_LIST_STR-TSL_NC sy-vline 
WA_BASW_SWITCHING_LIST_STR-HSL_NC sy-vline 
WA_BASW_SWITCHING_LIST_STR-LC2_NC sy-vline 
WA_BASW_SWITCHING_LIST_STR-LC3_NC sy-vline 
WA_BASW_SWITCHING_LIST_STR-TSL_I sy-vline 
WA_BASW_SWITCHING_LIST_STR-HSL_I sy-vline 
WA_BASW_SWITCHING_LIST_STR-LC2_I sy-vline 
WA_BASW_SWITCHING_LIST_STR-LC3_I sy-vline      INTO ld_text SEPARATED BY SPACE.

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