ABAP Select data from SAP table /DSD/VC_VLP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /DSD/VC_VLP 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 /DSD/VC_VLP. 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 /DSD/VC_VLP 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_/DSD/VC_VLP TYPE STANDARD TABLE OF /DSD/VC_VLP,
      WA_/DSD/VC_VLP TYPE /DSD/VC_VLP,
      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: </DSD/VC_VLP> TYPE /DSD/VC_VLP.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /DSD/VC_VLP
  INTO TABLE IT_/DSD/VC_VLP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /DSD/VC_VLP
*  INTO TABLE @DATA(IT_/DSD/VC_VLP2).
*--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_/DSD/VC_VLP INDEX 1 INTO DATA(WA_/DSD/VC_VLP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/DSD/VC_VLP ASSIGNING </DSD/VC_VLP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</DSD/VC_VLP>-MANDT = 1.
</DSD/VC_VLP>-VLID = 1.
</DSD/VC_VLP>-VLPOS = 1.
</DSD/VC_VLP>-SEQU = 1.
</DSD/VC_VLP>-KUNNR = 1.

ENDLOOP.

LOOP AT IT_/DSD/VC_VLP INTO WA_/DSD/VC_VLP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/DSD/VC_VLP-DURA, sy-vline,
  WA_/DSD/VC_VLP-DTRVD, sy-vline,
  WA_/DSD/VC_VLP-TRVD, sy-vline,
  WA_/DSD/VC_VLP-VKORG, sy-vline,
  WA_/DSD/VC_VLP-VTWEG, sy-vline,
  WA_/DSD/VC_VLP-SPARTE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/DSD/VC_VLP 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_/DSD/VC_VLP 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_/DSD/VC_VLP INTO WA_/DSD/VC_VLP.


*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 VLID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/VC_VLP-VLID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/VC_VLP-VLID.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TSTRN, internal->external for field DURA
CALL FUNCTION 'CONVERSION_EXIT_TSTRN_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/VC_VLP-DURA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/VC_VLP-DURA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTRN, internal->external for field DTRVD
CALL FUNCTION 'CONVERSION_EXIT_TSTRN_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/VC_VLP-DTRVD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/VC_VLP-DTRVD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTRN, internal->external for field TRVD
CALL FUNCTION 'CONVERSION_EXIT_TSTRN_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/VC_VLP-TRVD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/VC_VLP-TRVD.
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_/DSD/VC_VLP_STR, 
MANDT TYPE STRING,
VLID TYPE STRING,
VLPOS TYPE STRING,
SEQU TYPE STRING,
KUNNR TYPE STRING,
DURA TYPE STRING,
DTRVD TYPE STRING,
TRVD TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPARTE TYPE STRING,
PARNR TYPE STRING,
ABLAD TYPE STRING,
FMORE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/DSD/VC_VLP_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_/DSD/VC_VLP_STR-MANDT sy-vline 
WA_/DSD/VC_VLP_STR-VLID sy-vline 
WA_/DSD/VC_VLP_STR-VLPOS sy-vline 
WA_/DSD/VC_VLP_STR-SEQU sy-vline 
WA_/DSD/VC_VLP_STR-KUNNR sy-vline 
WA_/DSD/VC_VLP_STR-DURA sy-vline 
WA_/DSD/VC_VLP_STR-DTRVD sy-vline 
WA_/DSD/VC_VLP_STR-TRVD sy-vline 
WA_/DSD/VC_VLP_STR-VKORG sy-vline 
WA_/DSD/VC_VLP_STR-VTWEG sy-vline 
WA_/DSD/VC_VLP_STR-SPARTE sy-vline 
WA_/DSD/VC_VLP_STR-PARNR sy-vline 
WA_/DSD/VC_VLP_STR-ABLAD sy-vline 
WA_/DSD/VC_VLP_STR-FMORE sy-vline      INTO ld_text SEPARATED BY SPACE.

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