ABAP Select data from SAP table VNNLZ into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VNNLZ 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 VNNLZ. 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 VNNLZ 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_VNNLZ TYPE STANDARD TABLE OF VNNLZ,
      WA_VNNLZ TYPE VNNLZ,
      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: <VNNLZ> TYPE VNNLZ.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNNLZ
*  INTO TABLE @DATA(IT_VNNLZ2).
*--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_VNNLZ INDEX 1 INTO DATA(WA_VNNLZ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNNLZ>-MANDT = 1.
<VNNLZ>-LNRLS = 1.
<VNNLZ>-GPART = 1.
<VNNLZ>-ROLTP = 1.
<VNNLZ>-ASSTP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNNLZ-KZPRF, sy-vline,
  WA_VNNLZ-KZEAH, sy-vline,
  WA_VNNLZ-KZEXT, sy-vline,
  WA_VNNLZ-EINRI, sy-vline,
  WA_VNNLZ-FALNR, sy-vline,
  WA_VNNLZ-BETRAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNNLZ 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_VNNLZ 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_VNNLZ INTO WA_VNNLZ.


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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field ASHOSP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNNLZ-ASHOSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNNLZ-ASHOSP.
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_VNNLZ_STR, 
MANDT TYPE STRING,
LNRLS TYPE STRING,
GPART TYPE STRING,
ROLTP TYPE STRING,
ASSTP TYPE STRING,
KZPRF TYPE STRING,
KZEAH TYPE STRING,
KZEXT TYPE STRING,
EINRI TYPE STRING,
FALNR TYPE STRING,
BETRAG TYPE STRING,
PROZENT TYPE STRING,
AEQUI TYPE STRING,
ASHOSP TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNNLZ_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_VNNLZ_STR-MANDT sy-vline 
WA_VNNLZ_STR-LNRLS sy-vline 
WA_VNNLZ_STR-GPART sy-vline 
WA_VNNLZ_STR-ROLTP sy-vline 
WA_VNNLZ_STR-ASSTP sy-vline 
WA_VNNLZ_STR-KZPRF sy-vline 
WA_VNNLZ_STR-KZEAH sy-vline 
WA_VNNLZ_STR-KZEXT sy-vline 
WA_VNNLZ_STR-EINRI sy-vline 
WA_VNNLZ_STR-FALNR sy-vline 
WA_VNNLZ_STR-BETRAG sy-vline 
WA_VNNLZ_STR-PROZENT sy-vline 
WA_VNNLZ_STR-AEQUI sy-vline 
WA_VNNLZ_STR-ASHOSP sy-vline 
WA_VNNLZ_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.