ABAP Select data from SAP table VN1MEVO into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VN1MEVO 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 VN1MEVO. 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 VN1MEVO 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_VN1MEVO TYPE STANDARD TABLE OF VN1MEVO,
      WA_VN1MEVO TYPE VN1MEVO,
      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: <VN1MEVO> TYPE VN1MEVO.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VN1MEVO.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VN1MEVO
  INTO TABLE IT_VN1MEVO.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VN1MEVO
*  INTO TABLE @DATA(IT_VN1MEVO2).
*--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_VN1MEVO INDEX 1 INTO DATA(WA_VN1MEVO2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VN1MEVO ASSIGNING <VN1MEVO>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VN1MEVO>-MANDT = 1.
<VN1MEVO>-EINRI = 1.
<VN1MEVO>-MEVOID = 1.
<VN1MEVO>-THERSID = 1.
<VN1MEVO>-PATNR = 1.

ENDLOOP.

LOOP AT IT_VN1MEVO INTO WA_VN1MEVO.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VN1MEVO-FALNR, sy-vline,
  WA_VN1MEVO-MESTID, sy-vline,
  WA_VN1MEVO-MEREF, sy-vline,
  WA_VN1MEVO-REFEH, sy-vline,
  WA_VN1MEVO-REANZ, sy-vline,
  WA_VN1MEVO-MEVOL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VN1MEVO 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_VN1MEVO 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_VN1MEVO INTO WA_VN1MEVO.


*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_VN1MEVO-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN1MEVO-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VN1MEVO-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN1MEVO-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VN1MEVO-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN1MEVO-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field REFEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VN1MEVO-REFEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN1MEVO-REFEH.
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_VN1MEVO_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
MEVOID TYPE STRING,
THERSID TYPE STRING,
PATNR TYPE STRING,
FALNR TYPE STRING,
MESTID TYPE STRING,
MEREF TYPE STRING,
REFEH TYPE STRING,
REANZ TYPE STRING,
MEVOL TYPE STRING,
BEGDT TYPE STRING,
BEGTM TYPE STRING,
ENDDT TYPE STRING,
ENDTM TYPE STRING,
REFANZMO TYPE STRING,
REFANZMI TYPE STRING,
REFANZAB TYPE STRING,
REFANZNA TYPE STRING,
DFOID TYPE STRING,
AWEGID TYPE STRING,
AWEGT TYPE STRING,
MEBEMK TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
STORN TYPE STRING,
STUSR TYPE STRING,
STDAT TYPE STRING,
STOID TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VN1MEVO_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_VN1MEVO_STR-MANDT sy-vline 
WA_VN1MEVO_STR-EINRI sy-vline 
WA_VN1MEVO_STR-MEVOID sy-vline 
WA_VN1MEVO_STR-THERSID sy-vline 
WA_VN1MEVO_STR-PATNR sy-vline 
WA_VN1MEVO_STR-FALNR sy-vline 
WA_VN1MEVO_STR-MESTID sy-vline 
WA_VN1MEVO_STR-MEREF sy-vline 
WA_VN1MEVO_STR-REFEH sy-vline 
WA_VN1MEVO_STR-REANZ sy-vline 
WA_VN1MEVO_STR-MEVOL sy-vline 
WA_VN1MEVO_STR-BEGDT sy-vline 
WA_VN1MEVO_STR-BEGTM sy-vline 
WA_VN1MEVO_STR-ENDDT sy-vline 
WA_VN1MEVO_STR-ENDTM sy-vline 
WA_VN1MEVO_STR-REFANZMO sy-vline 
WA_VN1MEVO_STR-REFANZMI sy-vline 
WA_VN1MEVO_STR-REFANZAB sy-vline 
WA_VN1MEVO_STR-REFANZNA sy-vline 
WA_VN1MEVO_STR-DFOID sy-vline 
WA_VN1MEVO_STR-AWEGID sy-vline 
WA_VN1MEVO_STR-AWEGT sy-vline 
WA_VN1MEVO_STR-MEBEMK sy-vline 
WA_VN1MEVO_STR-ERDAT sy-vline 
WA_VN1MEVO_STR-ERUSR sy-vline 
WA_VN1MEVO_STR-UPDAT sy-vline 
WA_VN1MEVO_STR-UPUSR sy-vline 
WA_VN1MEVO_STR-STORN sy-vline 
WA_VN1MEVO_STR-STUSR sy-vline 
WA_VN1MEVO_STR-STDAT sy-vline 
WA_VN1MEVO_STR-STOID sy-vline 
WA_VN1MEVO_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.