ABAP Select data from SAP table VDM_S_DATE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VDM_S_DATE
*  INTO TABLE @DATA(IT_VDM_S_DATE2).
*--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_VDM_S_DATE INDEX 1 INTO DATA(WA_VDM_S_DATE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VDM_S_DATE>-CALENDARDATE = 1.
<VDM_S_DATE>-CALENDARYEAR = 1.
<VDM_S_DATE>-CALENDARMONTH = 1.
<VDM_S_DATE>-CALENDARQUARTER = 1.
<VDM_S_DATE>-CALENDARWEEK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VDM_S_DATE-CALENDARDAY, sy-vline,
  WA_VDM_S_DATE-WEEKDAY, sy-vline,
  WA_VDM_S_DATE-YEARWEEK, sy-vline,
  WA_VDM_S_DATE-YEARQUARTER, sy-vline,
  WA_VDM_S_DATE-YEARMONTH, sy-vline,
  WA_VDM_S_DATE-FIRSTDAYOFMONTHDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VDM_S_DATE 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_VDM_S_DATE 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_VDM_S_DATE INTO WA_VDM_S_DATE.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_VDM_S_DATE_STR, 
CALENDARDATE TYPE STRING,
CALENDARYEAR TYPE STRING,
CALENDARMONTH TYPE STRING,
CALENDARQUARTER TYPE STRING,
CALENDARWEEK TYPE STRING,
CALENDARDAY TYPE STRING,
WEEKDAY TYPE STRING,
YEARWEEK TYPE STRING,
YEARQUARTER TYPE STRING,
YEARMONTH TYPE STRING,
FIRSTDAYOFMONTHDATE TYPE STRING,
LASTDAYOFMONTHDATE TYPE STRING,
HALFYEAR TYPE STRING,
FIRSTDAYOFWEEKDATE TYPE STRING,
CALENDARDAYOFYEAR TYPE STRING,
YEARDAY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VDM_S_DATE_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_VDM_S_DATE_STR-CALENDARDATE sy-vline 
WA_VDM_S_DATE_STR-CALENDARYEAR sy-vline 
WA_VDM_S_DATE_STR-CALENDARMONTH sy-vline 
WA_VDM_S_DATE_STR-CALENDARQUARTER sy-vline 
WA_VDM_S_DATE_STR-CALENDARWEEK sy-vline 
WA_VDM_S_DATE_STR-CALENDARDAY sy-vline 
WA_VDM_S_DATE_STR-WEEKDAY sy-vline 
WA_VDM_S_DATE_STR-YEARWEEK sy-vline 
WA_VDM_S_DATE_STR-YEARQUARTER sy-vline 
WA_VDM_S_DATE_STR-YEARMONTH sy-vline 
WA_VDM_S_DATE_STR-FIRSTDAYOFMONTHDATE sy-vline 
WA_VDM_S_DATE_STR-LASTDAYOFMONTHDATE sy-vline 
WA_VDM_S_DATE_STR-HALFYEAR sy-vline 
WA_VDM_S_DATE_STR-FIRSTDAYOFWEEKDATE sy-vline 
WA_VDM_S_DATE_STR-CALENDARDAYOFYEAR sy-vline 
WA_VDM_S_DATE_STR-YEARDAY sy-vline      INTO ld_text SEPARATED BY SPACE.

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