ABAP Select data from SAP table VMDMEXTRFLD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VMDMEXTRFLD
*  INTO TABLE @DATA(IT_VMDMEXTRFLD2).
*--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_VMDMEXTRFLD INDEX 1 INTO DATA(WA_VMDMEXTRFLD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VMDMEXTRFLD>-EXTROBJECT = 1.
<VMDMEXTRFLD>-OBJVERS = 1.
<VMDMEXTRFLD>-CONTVERS = 1.
<VMDMEXTRFLD>-GROUPNAME = 1.
<VMDMEXTRFLD>-FIELDNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VMDMEXTRFLD-POSIT, sy-vline,
  WA_VMDMEXTRFLD-DTELNM, sy-vline,
  WA_VMDMEXTRFLD-DOMANM, sy-vline,
  WA_VMDMEXTRFLD-INTLEN, sy-vline,
  WA_VMDMEXTRFLD-INTTYPE, sy-vline,
  WA_VMDMEXTRFLD-DECIMALS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VMDMEXTRFLD 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_VMDMEXTRFLD 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_VMDMEXTRFLD INTO WA_VMDMEXTRFLD.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_VMDMEXTRFLD_STR, 
EXTROBJECT TYPE STRING,
OBJVERS TYPE STRING,
CONTVERS TYPE STRING,
GROUPNAME TYPE STRING,
FIELDNAME TYPE STRING,
POSIT TYPE STRING,
DTELNM TYPE STRING,
DOMANM TYPE STRING,
INTLEN TYPE STRING,
INTTYPE TYPE STRING,
DECIMALS TYPE STRING,
UNIFIELDNM TYPE STRING,
TRANSFER TYPE STRING,
SELECTION TYPE STRING,
VALUE_LOW TYPE STRING,
VALUE_HIGH TYPE STRING,
NO_REPL_META TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VMDMEXTRFLD_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_VMDMEXTRFLD_STR-EXTROBJECT sy-vline 
WA_VMDMEXTRFLD_STR-OBJVERS sy-vline 
WA_VMDMEXTRFLD_STR-CONTVERS sy-vline 
WA_VMDMEXTRFLD_STR-GROUPNAME sy-vline 
WA_VMDMEXTRFLD_STR-FIELDNAME sy-vline 
WA_VMDMEXTRFLD_STR-POSIT sy-vline 
WA_VMDMEXTRFLD_STR-DTELNM sy-vline 
WA_VMDMEXTRFLD_STR-DOMANM sy-vline 
WA_VMDMEXTRFLD_STR-INTLEN sy-vline 
WA_VMDMEXTRFLD_STR-INTTYPE sy-vline 
WA_VMDMEXTRFLD_STR-DECIMALS sy-vline 
WA_VMDMEXTRFLD_STR-UNIFIELDNM sy-vline 
WA_VMDMEXTRFLD_STR-TRANSFER sy-vline 
WA_VMDMEXTRFLD_STR-SELECTION sy-vline 
WA_VMDMEXTRFLD_STR-VALUE_LOW sy-vline 
WA_VMDMEXTRFLD_STR-VALUE_HIGH sy-vline 
WA_VMDMEXTRFLD_STR-NO_REPL_META sy-vline      INTO ld_text SEPARATED BY SPACE.

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