ABAP Select data from SAP table LWMSM_VBSK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LWMSM_VBSK
*  INTO TABLE @DATA(IT_LWMSM_VBSK2).
*--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_LWMSM_VBSK INDEX 1 INTO DATA(WA_LWMSM_VBSK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LWMSM_VBSK>-SAMMG = 1.
<LWMSM_VBSK>-SMART = 1.
<LWMSM_VBSK>-ERNAM = 1.
<LWMSM_VBSK>-ERDAT = 1.
<LWMSM_VBSK>-UZEIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LWMSM_VBSK-VBNUM, sy-vline,
  WA_LWMSM_VBSK-ERNUM, sy-vline,
  WA_LWMSM_VBSK-VSTEL, sy-vline,
  WA_LWMSM_VBSK-VTEXT, sy-vline,
  WA_LWMSM_VBSK-BATCH, sy-vline,
  WA_LWMSM_VBSK-ANZLP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LWMSM_VBSK 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_LWMSM_VBSK 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_LWMSM_VBSK INTO WA_LWMSM_VBSK.


*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 MODAT, internal->external for field ERDAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_VBSK-ERDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_VBSK-ERDAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TIMLO, internal->external for field UZEIT
CALL FUNCTION 'CONVERSION_EXIT_TIMLO_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_VBSK-UZEIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_VBSK-UZEIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MODAT, internal->external for field BEDAT
CALL FUNCTION 'CONVERSION_EXIT_MODAT_OUTPUT'
  EXPORTING
    input =                      WA_LWMSM_VBSK-BEDAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWMSM_VBSK-BEDAT.
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_LWMSM_VBSK_STR, 
SAMMG TYPE STRING,
SMART TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
UZEIT TYPE STRING,
VBNUM TYPE STRING,
ERNUM TYPE STRING,
VSTEL TYPE STRING,
VTEXT TYPE STRING,
BATCH TYPE STRING,
ANZLP TYPE STRING,
KWPRO TYPE STRING,
LGNUM TYPE STRING,
BEDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LWMSM_VBSK_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_LWMSM_VBSK_STR-SAMMG sy-vline 
WA_LWMSM_VBSK_STR-SMART sy-vline 
WA_LWMSM_VBSK_STR-ERNAM sy-vline 
WA_LWMSM_VBSK_STR-ERDAT sy-vline 
WA_LWMSM_VBSK_STR-UZEIT sy-vline 
WA_LWMSM_VBSK_STR-VBNUM sy-vline 
WA_LWMSM_VBSK_STR-ERNUM sy-vline 
WA_LWMSM_VBSK_STR-VSTEL sy-vline 
WA_LWMSM_VBSK_STR-VTEXT sy-vline 
WA_LWMSM_VBSK_STR-BATCH sy-vline 
WA_LWMSM_VBSK_STR-ANZLP sy-vline 
WA_LWMSM_VBSK_STR-KWPRO sy-vline 
WA_LWMSM_VBSK_STR-LGNUM sy-vline 
WA_LWMSM_VBSK_STR-BEDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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