ABAP Select data from SAP table /MRSS/V_DEM_ITEM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /MRSS/V_DEM_ITEM 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 /MRSS/V_DEM_ITEM. 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 /MRSS/V_DEM_ITEM 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_/MRSS/V_DEM_ITEM TYPE STANDARD TABLE OF /MRSS/V_DEM_ITEM,
      WA_/MRSS/V_DEM_ITEM TYPE /MRSS/V_DEM_ITEM,
      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: </MRSS/V_DEM_ITEM> TYPE /MRSS/V_DEM_ITEM.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /MRSS/V_DEM_ITEM
  INTO TABLE IT_/MRSS/V_DEM_ITEM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/V_DEM_ITEM
*  INTO TABLE @DATA(IT_/MRSS/V_DEM_ITEM2).
*--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_/MRSS/V_DEM_ITEM INDEX 1 INTO DATA(WA_/MRSS/V_DEM_ITEM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/MRSS/V_DEM_ITEM ASSIGNING </MRSS/V_DEM_ITEM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/V_DEM_ITEM>-CLIENT = 1.
</MRSS/V_DEM_ITEM>-GUID = 1.
</MRSS/V_DEM_ITEM>-PLVAR = 1.
</MRSS/V_DEM_ITEM>-OTYPE = 1.
</MRSS/V_DEM_ITEM>-OBJID = 1.

ENDLOOP.

LOOP AT IT_/MRSS/V_DEM_ITEM INTO WA_/MRSS/V_DEM_ITEM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/V_DEM_ITEM-VAL_FROM, sy-vline,
  WA_/MRSS/V_DEM_ITEM-VAL_TO, sy-vline,
  WA_/MRSS/V_DEM_ITEM-PLAN_FROM, sy-vline,
  WA_/MRSS/V_DEM_ITEM-PLAN_TO, sy-vline,
  WA_/MRSS/V_DEM_ITEM-EARL_START, sy-vline,
  WA_/MRSS/V_DEM_ITEM-LAT_START, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/V_DEM_ITEM 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_/MRSS/V_DEM_ITEM 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_/MRSS/V_DEM_ITEM INTO WA_/MRSS/V_DEM_ITEM.


*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 CUNIT, internal->external for field DURATION_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/V_DEM_ITEM-DURATION_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/V_DEM_ITEM-DURATION_UNIT.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field PROBABILITY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/V_DEM_ITEM-PROBABILITY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/V_DEM_ITEM-PROBABILITY.
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_/MRSS/V_DEM_ITEM_STR, 
CLIENT TYPE STRING,
GUID TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
VAL_FROM TYPE STRING,
VAL_TO TYPE STRING,
PLAN_FROM TYPE STRING,
PLAN_TO TYPE STRING,
EARL_START TYPE STRING,
LAT_START TYPE STRING,
EARL_END TYPE STRING,
LAT_END TYPE STRING,
SCHED_FROM TYPE STRING,
SCHED_TO TYPE STRING,
DURATION TYPE STRING,
DURATION_UNIT TYPE STRING,
UTIL TYPE STRING,
MULT_RES TYPE STRING,
STAT_REL TYPE STRING,
STRATEGY TYPE STRING,
PRE_ASSMT TYPE STRING,
IS_CAPACITIVE TYPE STRING,
IS_FIXED_DATE TYPE STRING,
IS_DESIRED_DATE TYPE STRING,
IS_ARRANGE_DATE TYPE STRING,
IS_RESOURCE_FIX TYPE STRING,
REQ_PROFILE_GUID TYPE STRING,
PRIORITY TYPE STRING,
MODEL TYPE STRING,
BEG_SLA TYPE STRING,
END_SLA TYPE STRING,
PARTNER_NO TYPE STRING,
ORDERED_PRODUCT TYPE STRING,
KUNNR TYPE STRING,
PROBABILITY TYPE STRING,
SUPERVISOR TYPE STRING,
FOUND_RESOURCES TYPE STRING,
PRODUCT TYPE STRING,
PRODUCT_KIND TYPE STRING,
AVAIL_DATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/V_DEM_ITEM_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_/MRSS/V_DEM_ITEM_STR-CLIENT sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-GUID sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PLVAR sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-OTYPE sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-OBJID sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-VAL_FROM sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-VAL_TO sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PLAN_FROM sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PLAN_TO sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-EARL_START sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-LAT_START sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-EARL_END sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-LAT_END sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-SCHED_FROM sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-SCHED_TO sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-DURATION sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-DURATION_UNIT sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-UTIL sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-MULT_RES sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-STAT_REL sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-STRATEGY sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PRE_ASSMT sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-IS_CAPACITIVE sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-IS_FIXED_DATE sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-IS_DESIRED_DATE sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-IS_ARRANGE_DATE sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-IS_RESOURCE_FIX sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-REQ_PROFILE_GUID sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PRIORITY sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-MODEL sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-BEG_SLA sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-END_SLA sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PARTNER_NO sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-ORDERED_PRODUCT sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-KUNNR sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PROBABILITY sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-SUPERVISOR sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-FOUND_RESOURCES sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PRODUCT sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-PRODUCT_KIND sy-vline 
WA_/MRSS/V_DEM_ITEM_STR-AVAIL_DATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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