ABAP Select data from SAP table VNLEM 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 VNLEM 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 VNLEM. 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 VNLEM 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_VNLEM TYPE STANDARD TABLE OF VNLEM,
      WA_VNLEM TYPE VNLEM,
      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: <VNLEM> TYPE VNLEM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNLEM
*  INTO TABLE @DATA(IT_VNLEM2).
*--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_VNLEM INDEX 1 INTO DATA(WA_VNLEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNLEM>-MANDT = 1.
<VNLEM>-LNRLS = 1.
<VNLEM>-EINRI = 1.
<VNLEM>-PATNR = 1.
<VNLEM>-STOID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNLEM-LSSTAE, sy-vline,
  WA_VNLEM-ANFID, sy-vline,
  WA_VNLEM-NTRKZ, sy-vline,
  WA_VNLEM-WBGDT, sy-vline,
  WA_VNLEM-WBGZT, sy-vline,
  WA_VNLEM-ERGTX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNLEM 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_VNLEM 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_VNLEM INTO WA_VNLEM.


*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_VNLEM-LNRLS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNLEM-LNRLS.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field PAPID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNLEM-PAPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNLEM-PAPID.
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_VNLEM_STR, 
MANDT TYPE STRING,
LNRLS TYPE STRING,
EINRI TYPE STRING,
PATNR TYPE STRING,
STOID TYPE STRING,
LSSTAE TYPE STRING,
ANFID TYPE STRING,
NTRKZ TYPE STRING,
WBGDT TYPE STRING,
WBGZT TYPE STRING,
ERGTX TYPE STRING,
ERLTX TYPE STRING,
BEFR TYPE STRING,
BFEINH TYPE STRING,
BFENDDT TYPE STRING,
SORTLEIST TYPE STRING,
WBZPI TYPE STRING,
DAUER TYPE STRING,
ZIMMR TYPE STRING,
IFG TYPE STRING,
ANERF TYPE STRING,
LSLOK TYPE STRING,
PATEIN TYPE STRING,
PMEDFG TYPE STRING,
PMEDVS TYPE STRING,
PZMAN TYPE STRING,
ANKLS TYPE STRING,
OPNR TYPE STRING,
FALNR TYPE STRING,
ERBOE TYPE STRING,
IBGDT TYPE STRING,
IBZT TYPE STRING,
N1MEDLEI TYPE STRING,
N1PFLLEI TYPE STRING,
DOCXS TYPE STRING,
TEAMXS TYPE STRING,
MATXS TYPE STRING,
PATNUE TYPE STRING,
TERMINF TYPE STRING,
LIDI TYPE STRING,
VKGID TYPE STRING,
LNRAPP TYPE STRING,
TMNID TYPE STRING,
VBUND TYPE STRING,
PAPID TYPE STRING,
HIC_FREE_MED TYPE STRING,
CYSRVTPLID TYPE STRING,
CYDAT TYPE STRING,
CYTIM TYPE STRING,
CYDEFID TYPE STRING,
GENCYID TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNLEM_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_VNLEM_STR-MANDT sy-vline 
WA_VNLEM_STR-LNRLS sy-vline 
WA_VNLEM_STR-EINRI sy-vline 
WA_VNLEM_STR-PATNR sy-vline 
WA_VNLEM_STR-STOID sy-vline 
WA_VNLEM_STR-LSSTAE sy-vline 
WA_VNLEM_STR-ANFID sy-vline 
WA_VNLEM_STR-NTRKZ sy-vline 
WA_VNLEM_STR-WBGDT sy-vline 
WA_VNLEM_STR-WBGZT sy-vline 
WA_VNLEM_STR-ERGTX sy-vline 
WA_VNLEM_STR-ERLTX sy-vline 
WA_VNLEM_STR-BEFR sy-vline 
WA_VNLEM_STR-BFEINH sy-vline 
WA_VNLEM_STR-BFENDDT sy-vline 
WA_VNLEM_STR-SORTLEIST sy-vline 
WA_VNLEM_STR-WBZPI sy-vline 
WA_VNLEM_STR-DAUER sy-vline 
WA_VNLEM_STR-ZIMMR sy-vline 
WA_VNLEM_STR-IFG sy-vline 
WA_VNLEM_STR-ANERF sy-vline 
WA_VNLEM_STR-LSLOK sy-vline 
WA_VNLEM_STR-PATEIN sy-vline 
WA_VNLEM_STR-PMEDFG sy-vline 
WA_VNLEM_STR-PMEDVS sy-vline 
WA_VNLEM_STR-PZMAN sy-vline 
WA_VNLEM_STR-ANKLS sy-vline 
WA_VNLEM_STR-OPNR sy-vline 
WA_VNLEM_STR-FALNR sy-vline 
WA_VNLEM_STR-ERBOE sy-vline 
WA_VNLEM_STR-IBGDT sy-vline 
WA_VNLEM_STR-IBZT sy-vline 
WA_VNLEM_STR-N1MEDLEI sy-vline 
WA_VNLEM_STR-N1PFLLEI sy-vline 
WA_VNLEM_STR-DOCXS sy-vline 
WA_VNLEM_STR-TEAMXS sy-vline 
WA_VNLEM_STR-MATXS sy-vline 
WA_VNLEM_STR-PATNUE sy-vline 
WA_VNLEM_STR-TERMINF sy-vline 
WA_VNLEM_STR-LIDI sy-vline 
WA_VNLEM_STR-VKGID sy-vline 
WA_VNLEM_STR-LNRAPP sy-vline 
WA_VNLEM_STR-TMNID sy-vline 
WA_VNLEM_STR-VBUND sy-vline 
WA_VNLEM_STR-PAPID sy-vline 
WA_VNLEM_STR-HIC_FREE_MED sy-vline 
WA_VNLEM_STR-CYSRVTPLID sy-vline 
WA_VNLEM_STR-CYDAT sy-vline 
WA_VNLEM_STR-CYTIM sy-vline 
WA_VNLEM_STR-CYDEFID sy-vline 
WA_VNLEM_STR-GENCYID sy-vline 
WA_VNLEM_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.