ABAP Select data from SAP table VNAPP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNAPP
*  INTO TABLE @DATA(IT_VNAPP2).
*--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_VNAPP INDEX 1 INTO DATA(WA_VNAPP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNAPP>-MANDT = 1.
<VNAPP>-LNRAPP = 1.
<VNAPP>-EINRI = 1.
<VNAPP>-FALNR = 1.
<VNAPP>-LFDNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNAPP-DSPTY, sy-vline,
  WA_VNAPP-VISTY, sy-vline,
  WA_VNAPP-BWIDT, sy-vline,
  WA_VNAPP-BWIZT, sy-vline,
  WA_VNAPP-STATU, sy-vline,
  WA_VNAPP-ORGFA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNAPP 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_VNAPP 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_VNAPP INTO WA_VNAPP.


*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 LNRAPP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNAPP-LNRAPP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNAPP-LNRAPP.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field TMNID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNAPP-TMNID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNAPP-TMNID.
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_VNAPP_STR, 
MANDT TYPE STRING,
LNRAPP TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LFDNR TYPE STRING,
DSPTY TYPE STRING,
VISTY TYPE STRING,
BWIDT TYPE STRING,
BWIZT TYPE STRING,
STATU TYPE STRING,
ORGFA TYPE STRING,
ORGPF TYPE STRING,
POBNR TYPE STRING,
PERNR TYPE STRING,
ZIMMR TYPE STRING,
KZTXT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
LGTXT TYPE STRING,
DAUER TYPE STRING,
FACHR TYPE STRING,
PELOC TYPE STRING,
STOID TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
TMNID TYPE STRING,
PTINP TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNAPP_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_VNAPP_STR-MANDT sy-vline 
WA_VNAPP_STR-LNRAPP sy-vline 
WA_VNAPP_STR-EINRI sy-vline 
WA_VNAPP_STR-FALNR sy-vline 
WA_VNAPP_STR-LFDNR sy-vline 
WA_VNAPP_STR-DSPTY sy-vline 
WA_VNAPP_STR-VISTY sy-vline 
WA_VNAPP_STR-BWIDT sy-vline 
WA_VNAPP_STR-BWIZT sy-vline 
WA_VNAPP_STR-STATU sy-vline 
WA_VNAPP_STR-ORGFA sy-vline 
WA_VNAPP_STR-ORGPF sy-vline 
WA_VNAPP_STR-POBNR sy-vline 
WA_VNAPP_STR-PERNR sy-vline 
WA_VNAPP_STR-ZIMMR sy-vline 
WA_VNAPP_STR-KZTXT sy-vline 
WA_VNAPP_STR-ERDAT sy-vline 
WA_VNAPP_STR-ERUSR sy-vline 
WA_VNAPP_STR-UPDAT sy-vline 
WA_VNAPP_STR-UPUSR sy-vline 
WA_VNAPP_STR-LGTXT sy-vline 
WA_VNAPP_STR-DAUER sy-vline 
WA_VNAPP_STR-FACHR sy-vline 
WA_VNAPP_STR-PELOC sy-vline 
WA_VNAPP_STR-STOID sy-vline 
WA_VNAPP_STR-STORN sy-vline 
WA_VNAPP_STR-STUSR sy-vline 
WA_VNAPP_STR-STDAT sy-vline 
WA_VNAPP_STR-TMNID sy-vline 
WA_VNAPP_STR-PTINP sy-vline 
WA_VNAPP_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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