ABAP Select data from SAP table DBVLEXT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DBVLEXT
*  INTO TABLE @DATA(IT_DBVLEXT2).
*--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_DBVLEXT INDEX 1 INTO DATA(WA_DBVLEXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DBVLEXT>-MAFID = 1.
<DBVLEXT>-PLSCN = 1.
<DBVLEXT>-DISST = 1.
<DBVLEXT>-MATNR = 1.
<DBVLEXT>-MAKTX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DBVLEXT-BERID, sy-vline,
  WA_DBVLEXT-WERKS, sy-vline,
  WA_DBVLEXT-DISPO, sy-vline,
  WA_DBVLEXT-MPSKZ, sy-vline,
  WA_DBVLEXT-GSAEN, sy-vline,
  WA_DBVLEXT-AKKEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DBVLEXT 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_DBVLEXT 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_DBVLEXT INTO WA_DBVLEXT.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_DBVLEXT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DBVLEXT-MATNR.
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_DBVLEXT_STR, 
MAFID TYPE STRING,
PLSCN TYPE STRING,
DISST TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
BERID TYPE STRING,
WERKS TYPE STRING,
DISPO TYPE STRING,
MPSKZ TYPE STRING,
GSAEN TYPE STRING,
AKKEN TYPE STRING,
RESDT TYPE STRING,
RESAL TYPE STRING,
RHYTD TYPE STRING,
USTMP TYPE STRING,
DSTMP TYPE STRING,
ERDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DBVLEXT_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_DBVLEXT_STR-MAFID sy-vline 
WA_DBVLEXT_STR-PLSCN sy-vline 
WA_DBVLEXT_STR-DISST sy-vline 
WA_DBVLEXT_STR-MATNR sy-vline 
WA_DBVLEXT_STR-MAKTX sy-vline 
WA_DBVLEXT_STR-BERID sy-vline 
WA_DBVLEXT_STR-WERKS sy-vline 
WA_DBVLEXT_STR-DISPO sy-vline 
WA_DBVLEXT_STR-MPSKZ sy-vline 
WA_DBVLEXT_STR-GSAEN sy-vline 
WA_DBVLEXT_STR-AKKEN sy-vline 
WA_DBVLEXT_STR-RESDT sy-vline 
WA_DBVLEXT_STR-RESAL sy-vline 
WA_DBVLEXT_STR-RHYTD sy-vline 
WA_DBVLEXT_STR-USTMP sy-vline 
WA_DBVLEXT_STR-DSTMP sy-vline 
WA_DBVLEXT_STR-ERDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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