ABAP Select data from SAP table V_MRP_RESERV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_MRP_RESERV
*  INTO TABLE @DATA(IT_V_MRP_RESERV2).
*--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_V_MRP_RESERV INDEX 1 INTO DATA(WA_V_MRP_RESERV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_MRP_RESERV>-MANDT = 1.
<V_MRP_RESERV>-RESERVATION = 1.
<V_MRP_RESERV>-RESERVATIONITEM4 = 1.
<V_MRP_RESERV>-RESERVATIONITEM6 = 1.
<V_MRP_RESERV>-RESERVATIONRECORDTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_MRP_RESERV-REQUIREMENTTYPE, sy-vline,
  WA_V_MRP_RESERV-MATERIAL, sy-vline,
  WA_V_MRP_RESERV-PLANT, sy-vline,
  WA_V_MRP_RESERV-STORAGELOCATION, sy-vline,
  WA_V_MRP_RESERV-INVENTORYSPECIALSTOCKTYPE, sy-vline,
  WA_V_MRP_RESERV-SALESORDER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_MRP_RESERV 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_V_MRP_RESERV 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_V_MRP_RESERV INTO WA_V_MRP_RESERV.


*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 MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_V_MRP_RESERV-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_MRP_RESERV-MATERIAL.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ABPSP, internal->external for field WBSELEMENTINTERNALID
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_V_MRP_RESERV-WBSELEMENTINTERNALID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_MRP_RESERV-WBSELEMENTINTERNALID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MATERIALBASEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_V_MRP_RESERV-MATERIALBASEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_MRP_RESERV-MATERIALBASEUNIT.
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_V_MRP_RESERV_STR, 
MANDT TYPE STRING,
RESERVATION TYPE STRING,
RESERVATIONITEM4 TYPE STRING,
RESERVATIONITEM6 TYPE STRING,
RESERVATIONRECORDTYPE TYPE STRING,
REQUIREMENTTYPE TYPE STRING,
MATERIAL TYPE STRING,
PLANT TYPE STRING,
STORAGELOCATION TYPE STRING,
INVENTORYSPECIALSTOCKTYPE TYPE STRING,
SALESORDER TYPE STRING,
SALESORDERITEM TYPE STRING,
WBSELEMENTINTERNALID TYPE STRING,
REQUIREMENTDATE TYPE STRING,
REQUIREDQUANTITY TYPE STRING,
WITHDRAWNQUANTITY TYPE STRING,
MATERIALBASEUNIT TYPE STRING,
RESERVATIONISFINALLYISSUED TYPE STRING,
MATERIALCOMPONENTISPHANTOMITEM TYPE STRING,
MATERIALISBULKMATERIAL TYPE STRING,
MRPPLANNINGSEGMENTTYPE TYPE STRING,
MRPPLANNINGSEGMENTNUMBER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_MRP_RESERV_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_V_MRP_RESERV_STR-MANDT sy-vline 
WA_V_MRP_RESERV_STR-RESERVATION sy-vline 
WA_V_MRP_RESERV_STR-RESERVATIONITEM4 sy-vline 
WA_V_MRP_RESERV_STR-RESERVATIONITEM6 sy-vline 
WA_V_MRP_RESERV_STR-RESERVATIONRECORDTYPE sy-vline 
WA_V_MRP_RESERV_STR-REQUIREMENTTYPE sy-vline 
WA_V_MRP_RESERV_STR-MATERIAL sy-vline 
WA_V_MRP_RESERV_STR-PLANT sy-vline 
WA_V_MRP_RESERV_STR-STORAGELOCATION sy-vline 
WA_V_MRP_RESERV_STR-INVENTORYSPECIALSTOCKTYPE sy-vline 
WA_V_MRP_RESERV_STR-SALESORDER sy-vline 
WA_V_MRP_RESERV_STR-SALESORDERITEM sy-vline 
WA_V_MRP_RESERV_STR-WBSELEMENTINTERNALID sy-vline 
WA_V_MRP_RESERV_STR-REQUIREMENTDATE sy-vline 
WA_V_MRP_RESERV_STR-REQUIREDQUANTITY sy-vline 
WA_V_MRP_RESERV_STR-WITHDRAWNQUANTITY sy-vline 
WA_V_MRP_RESERV_STR-MATERIALBASEUNIT sy-vline 
WA_V_MRP_RESERV_STR-RESERVATIONISFINALLYISSUED sy-vline 
WA_V_MRP_RESERV_STR-MATERIALCOMPONENTISPHANTOMITEM sy-vline 
WA_V_MRP_RESERV_STR-MATERIALISBULKMATERIAL sy-vline 
WA_V_MRP_RESERV_STR-MRPPLANNINGSEGMENTTYPE sy-vline 
WA_V_MRP_RESERV_STR-MRPPLANNINGSEGMENTNUMBER sy-vline      INTO ld_text SEPARATED BY SPACE.

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