ABAP Select data from SAP table WMVC_SEL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WMVC_SEL
*  INTO TABLE @DATA(IT_WMVC_SEL2).
*--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_WMVC_SEL INDEX 1 INTO DATA(WA_WMVC_SEL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WMVC_SEL>-ATINN1 = 1.
<WMVC_SEL>-ATNAM1 = 1.
<WMVC_SEL>-ATBEZ1 = 1.
<WMVC_SEL>-ATINN2 = 1.
<WMVC_SEL>-ATNAM2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WMVC_SEL-ATBEZ2, sy-vline,
  WA_WMVC_SEL-WRLST1, sy-vline,
  WA_WMVC_SEL-BEZEI1W, sy-vline,
  WA_WMVC_SEL-QOLST1, sy-vline,
  WA_WMVC_SEL-BEZEI1, sy-vline,
  WA_WMVC_SEL-WRLST2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WMVC_SEL 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_WMVC_SEL 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_WMVC_SEL INTO WA_WMVC_SEL.


*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 ATINN, internal->external for field ATINN1
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_WMVC_SEL-ATINN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMVC_SEL-ATINN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ATINN, internal->external for field ATINN2
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_WMVC_SEL-ATINN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WMVC_SEL-ATINN2.
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_WMVC_SEL_STR, 
ATINN1 TYPE STRING,
ATNAM1 TYPE STRING,
ATBEZ1 TYPE STRING,
ATINN2 TYPE STRING,
ATNAM2 TYPE STRING,
ATBEZ2 TYPE STRING,
WRLST1 TYPE STRING,
BEZEI1W TYPE STRING,
QOLST1 TYPE STRING,
BEZEI1 TYPE STRING,
WRLST2 TYPE STRING,
BEZEI2W TYPE STRING,
QOLST2 TYPE STRING,
BEZEI2 TYPE STRING,
MANUAL1 TYPE STRING,
MANUAL2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WMVC_SEL_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_WMVC_SEL_STR-ATINN1 sy-vline 
WA_WMVC_SEL_STR-ATNAM1 sy-vline 
WA_WMVC_SEL_STR-ATBEZ1 sy-vline 
WA_WMVC_SEL_STR-ATINN2 sy-vline 
WA_WMVC_SEL_STR-ATNAM2 sy-vline 
WA_WMVC_SEL_STR-ATBEZ2 sy-vline 
WA_WMVC_SEL_STR-WRLST1 sy-vline 
WA_WMVC_SEL_STR-BEZEI1W sy-vline 
WA_WMVC_SEL_STR-QOLST1 sy-vline 
WA_WMVC_SEL_STR-BEZEI1 sy-vline 
WA_WMVC_SEL_STR-WRLST2 sy-vline 
WA_WMVC_SEL_STR-BEZEI2W sy-vline 
WA_WMVC_SEL_STR-QOLST2 sy-vline 
WA_WMVC_SEL_STR-BEZEI2 sy-vline 
WA_WMVC_SEL_STR-MANUAL1 sy-vline 
WA_WMVC_SEL_STR-MANUAL2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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