ABAP Select data from SAP table V_FMRESERV_K into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_FMRESERV_K 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_FMRESERV_K. 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_FMRESERV_K 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_FMRESERV_K TYPE STANDARD TABLE OF V_FMRESERV_K,
      WA_V_FMRESERV_K TYPE V_FMRESERV_K,
      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_FMRESERV_K> TYPE V_FMRESERV_K.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_FMRESERV_K
*  INTO TABLE @DATA(IT_V_FMRESERV_K2).
*--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_FMRESERV_K INDEX 1 INTO DATA(WA_V_FMRESERV_K2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_FMRESERV_K>-MANDT = 1.
<V_FMRESERV_K>-BELNR = 1.
<V_FMRESERV_K>-BLPOS = 1.
<V_FMRESERV_K>-BLART = 1.
<V_FMRESERV_K>-BLTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_FMRESERV_K-NPRBUDGET, sy-vline,
  WA_V_FMRESERV_K-WAERS, sy-vline,
  WA_V_FMRESERV_K-BUKRS, sy-vline,
  WA_V_FMRESERV_K-ERLKZ, sy-vline,
  WA_V_FMRESERV_K-STATS, sy-vline,
  WA_V_FMRESERV_K-BLPKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_FMRESERV_K 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_FMRESERV_K 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_FMRESERV_K INTO WA_V_FMRESERV_K.


*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 BELNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_FMRESERV_K-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_FMRESERV_K-BELNR.
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_FMRESERV_K_STR, 
MANDT TYPE STRING,
BELNR TYPE STRING,
BLPOS TYPE STRING,
BLART TYPE STRING,
BLTYP TYPE STRING,
NPRBUDGET TYPE STRING,
WAERS TYPE STRING,
BUKRS TYPE STRING,
ERLKZ TYPE STRING,
STATS TYPE STRING,
BLPKZ TYPE STRING,
ABGWAERS TYPE STRING,
WKAPP TYPE STRING,
CARRYOV TYPE STRING,
CONSUMEKZ TYPE STRING,
ACCHANG TYPE STRING,
MVSTAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_FMRESERV_K_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_FMRESERV_K_STR-MANDT sy-vline 
WA_V_FMRESERV_K_STR-BELNR sy-vline 
WA_V_FMRESERV_K_STR-BLPOS sy-vline 
WA_V_FMRESERV_K_STR-BLART sy-vline 
WA_V_FMRESERV_K_STR-BLTYP sy-vline 
WA_V_FMRESERV_K_STR-NPRBUDGET sy-vline 
WA_V_FMRESERV_K_STR-WAERS sy-vline 
WA_V_FMRESERV_K_STR-BUKRS sy-vline 
WA_V_FMRESERV_K_STR-ERLKZ sy-vline 
WA_V_FMRESERV_K_STR-STATS sy-vline 
WA_V_FMRESERV_K_STR-BLPKZ sy-vline 
WA_V_FMRESERV_K_STR-ABGWAERS sy-vline 
WA_V_FMRESERV_K_STR-WKAPP sy-vline 
WA_V_FMRESERV_K_STR-CARRYOV sy-vline 
WA_V_FMRESERV_K_STR-CONSUMEKZ sy-vline 
WA_V_FMRESERV_K_STR-ACCHANG sy-vline 
WA_V_FMRESERV_K_STR-MVSTAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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