ABAP Select data from SAP table VNLOP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNLOP
*  INTO TABLE @DATA(IT_VNLOP2).
*--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_VNLOP INDEX 1 INTO DATA(WA_VNLOP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNLOP>-MANDT = 1.
<VNLOP>-EINRI = 1.
<VNLOP>-FALNR = 1.
<VNLOP>-LNRLS = 1.
<VNLOP>-ICPMK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNLOP-ICPML, sy-vline,
  WA_VNLOP-LNRDI, sy-vline,
  WA_VNLOP-ICDKT, sy-vline,
  WA_VNLOP-ICDKY, sy-vline,
  WA_VNLOP-ICPHC, sy-vline,
  WA_VNLOP-ANZOP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNLOP 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_VNLOP 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_VNLOP INTO WA_VNLOP.


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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field LSLOK
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNLOP-LSLOK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNLOP-LSLOK.
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_VNLOP_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
LNRLS TYPE STRING,
ICPMK TYPE STRING,
ICPML TYPE STRING,
LNRDI TYPE STRING,
ICDKT TYPE STRING,
ICDKY TYPE STRING,
ICPHC TYPE STRING,
ANZOP TYPE STRING,
LEIST TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
LSLOK TYPE STRING,
IDENT TYPE STRING,
MIGKZ TYPE STRING,
MEDMIGKZ TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNLOP_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_VNLOP_STR-MANDT sy-vline 
WA_VNLOP_STR-EINRI sy-vline 
WA_VNLOP_STR-FALNR sy-vline 
WA_VNLOP_STR-LNRLS sy-vline 
WA_VNLOP_STR-ICPMK sy-vline 
WA_VNLOP_STR-ICPML sy-vline 
WA_VNLOP_STR-LNRDI sy-vline 
WA_VNLOP_STR-ICDKT sy-vline 
WA_VNLOP_STR-ICDKY sy-vline 
WA_VNLOP_STR-ICPHC sy-vline 
WA_VNLOP_STR-ANZOP sy-vline 
WA_VNLOP_STR-LEIST sy-vline 
WA_VNLOP_STR-UPDAT sy-vline 
WA_VNLOP_STR-UPUSR sy-vline 
WA_VNLOP_STR-LSLOK sy-vline 
WA_VNLOP_STR-IDENT sy-vline 
WA_VNLOP_STR-MIGKZ sy-vline 
WA_VNLOP_STR-MEDMIGKZ sy-vline 
WA_VNLOP_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.