ABAP Select data from SAP table WFMV_WKNDDAYSN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFMV_WKNDDAYSN
*  INTO TABLE @DATA(IT_WFMV_WKNDDAYSN2).
*--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_WFMV_WKNDDAYSN INDEX 1 INTO DATA(WA_WFMV_WKNDDAYSN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFMV_WKNDDAYSN>-MANDT = 1.
<WFMV_WKNDDAYSN>-LOCATION_TYPE = 1.
<WFMV_WKNDDAYSN>-EXTERNAL_KEY = 1.
<WFMV_WKNDDAYSN>-START_DATE = 1.
<WFMV_WKNDDAYSN>-END_DATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFMV_WKNDDAYSN-SNAME, sy-vline,
  WA_WFMV_WKNDDAYSN-MONDAY, sy-vline,
  WA_WFMV_WKNDDAYSN-TUESDAY, sy-vline,
  WA_WFMV_WKNDDAYSN-WEDNESDAY, sy-vline,
  WA_WFMV_WKNDDAYSN-THURSDAY, sy-vline,
  WA_WFMV_WKNDDAYSN-FRIDAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFMV_WKNDDAYSN 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_WFMV_WKNDDAYSN 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_WFMV_WKNDDAYSN INTO WA_WFMV_WKNDDAYSN.


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

*Conversion exit ALPHA, internal->external for field EXTERNAL_KEY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WFMV_WKNDDAYSN-EXTERNAL_KEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFMV_WKNDDAYSN-EXTERNAL_KEY.
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_WFMV_WKNDDAYSN_STR, 
MANDT TYPE STRING,
LOCATION_TYPE TYPE STRING,
EXTERNAL_KEY TYPE STRING,
START_DATE TYPE STRING,
END_DATE TYPE STRING,
SNAME TYPE STRING,
MONDAY TYPE STRING,
TUESDAY TYPE STRING,
WEDNESDAY TYPE STRING,
THURSDAY TYPE STRING,
FRIDAY TYPE STRING,
SATURDAY TYPE STRING,
SUNDAY TYPE STRING,
LNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFMV_WKNDDAYSN_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_WFMV_WKNDDAYSN_STR-MANDT sy-vline 
WA_WFMV_WKNDDAYSN_STR-LOCATION_TYPE sy-vline 
WA_WFMV_WKNDDAYSN_STR-EXTERNAL_KEY sy-vline 
WA_WFMV_WKNDDAYSN_STR-START_DATE sy-vline 
WA_WFMV_WKNDDAYSN_STR-END_DATE sy-vline 
WA_WFMV_WKNDDAYSN_STR-SNAME sy-vline 
WA_WFMV_WKNDDAYSN_STR-MONDAY sy-vline 
WA_WFMV_WKNDDAYSN_STR-TUESDAY sy-vline 
WA_WFMV_WKNDDAYSN_STR-WEDNESDAY sy-vline 
WA_WFMV_WKNDDAYSN_STR-THURSDAY sy-vline 
WA_WFMV_WKNDDAYSN_STR-FRIDAY sy-vline 
WA_WFMV_WKNDDAYSN_STR-SATURDAY sy-vline 
WA_WFMV_WKNDDAYSN_STR-SUNDAY sy-vline 
WA_WFMV_WKNDDAYSN_STR-LNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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