ABAP Select data from SAP table V_FMRESERV_P 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_P 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_P. 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_P 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_P TYPE STANDARD TABLE OF V_FMRESERV_P,
      WA_V_FMRESERV_P TYPE V_FMRESERV_P,
      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_P> TYPE V_FMRESERV_P.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_FMRESERV_P
*  INTO TABLE @DATA(IT_V_FMRESERV_P2).
*--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_P INDEX 1 INTO DATA(WA_V_FMRESERV_P2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_FMRESERV_P-NPRBUDGET, sy-vline,
  WA_V_FMRESERV_P-WAERS, sy-vline,
  WA_V_FMRESERV_P-BUKRS, sy-vline,
  WA_V_FMRESERV_P-KOKRS, sy-vline,
  WA_V_FMRESERV_P-AUFNR, sy-vline,
  WA_V_FMRESERV_P-KOSTL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_FMRESERV_P 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_P 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_P INTO WA_V_FMRESERV_P.


*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_P-BELNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_FMRESERV_P-BELNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit ABPSN, internal->external for field POSID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_V_FMRESERV_P-POSID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_FMRESERV_P-POSID.
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_P_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,
KOKRS TYPE STRING,
AUFNR TYPE STRING,
KOSTL TYPE STRING,
PSPNR TYPE STRING,
SAKNR TYPE STRING,
POSID TYPE STRING,
MVSTAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_FMRESERV_P_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_P_STR-MANDT sy-vline 
WA_V_FMRESERV_P_STR-BELNR sy-vline 
WA_V_FMRESERV_P_STR-BLPOS sy-vline 
WA_V_FMRESERV_P_STR-BLART sy-vline 
WA_V_FMRESERV_P_STR-BLTYP sy-vline 
WA_V_FMRESERV_P_STR-NPRBUDGET sy-vline 
WA_V_FMRESERV_P_STR-WAERS sy-vline 
WA_V_FMRESERV_P_STR-BUKRS sy-vline 
WA_V_FMRESERV_P_STR-KOKRS sy-vline 
WA_V_FMRESERV_P_STR-AUFNR sy-vline 
WA_V_FMRESERV_P_STR-KOSTL sy-vline 
WA_V_FMRESERV_P_STR-PSPNR sy-vline 
WA_V_FMRESERV_P_STR-SAKNR sy-vline 
WA_V_FMRESERV_P_STR-POSID sy-vline 
WA_V_FMRESERV_P_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.