ABAP Select data from SAP table VLCVBAK_S into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VLCVBAK_S
*  INTO TABLE @DATA(IT_VLCVBAK_S2).
*--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_VLCVBAK_S INDEX 1 INTO DATA(WA_VLCVBAK_S2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VLCVBAK_S>-VBELN = 1.
<VLCVBAK_S>-KUNNR_SD = 1.
<VLCVBAK_S>-KUNAM_SD = 1.
<VLCVBAK_S>-KUNWE_SD = 1.
<VLCVBAK_S>-WENAM_SD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VLCVBAK_S-KUNRE_SD, sy-vline,
  WA_VLCVBAK_S-RENAM_SD, sy-vline,
  WA_VLCVBAK_S-KUNRG_SD, sy-vline,
  WA_VLCVBAK_S-RGNAM_SD, sy-vline,
  WA_VLCVBAK_S-ANGDT, sy-vline,
  WA_VLCVBAK_S-BNDDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VLCVBAK_S 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_VLCVBAK_S 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_VLCVBAK_S INTO WA_VLCVBAK_S.


*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 VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VLCVBAK_S-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VLCVBAK_S-VBELN.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit AUART, internal->external for field AUART
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_VLCVBAK_S-AUART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VLCVBAK_S-AUART.
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_VLCVBAK_S_STR, 
VBELN TYPE STRING,
KUNNR_SD TYPE STRING,
KUNAM_SD TYPE STRING,
KUNWE_SD TYPE STRING,
WENAM_SD TYPE STRING,
KUNRE_SD TYPE STRING,
RENAM_SD TYPE STRING,
KUNRG_SD TYPE STRING,
RGNAM_SD TYPE STRING,
ANGDT TYPE STRING,
BNDDT TYPE STRING,
AUDAT TYPE STRING,
VBTYP TYPE STRING,
AUART TYPE STRING,
AUGRU TYPE STRING,
VSART TYPE STRING,
ABSTK TYPE STRING,
FAKSK TYPE STRING,
NETWR TYPE STRING,
WAERK TYPE STRING,
VKORG TYPE STRING,
VKORGTXT TYPE STRING,
VTWEG TYPE STRING,
VTWEGTXT TYPE STRING,
SPART TYPE STRING,
SPARTTXT TYPE STRING,
VKGRP TYPE STRING,
VKBUR TYPE STRING,
VDATU TYPE STRING,
BSTNK TYPE STRING,
BSTDK TYPE STRING,
ERDAT TYPE STRING,
ERDAT_SD TYPE STRING,
ERNAM_SD TYPE STRING,
AEDAT TYPE STRING,
UPD_TMSTMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VLCVBAK_S_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_VLCVBAK_S_STR-VBELN sy-vline 
WA_VLCVBAK_S_STR-KUNNR_SD sy-vline 
WA_VLCVBAK_S_STR-KUNAM_SD sy-vline 
WA_VLCVBAK_S_STR-KUNWE_SD sy-vline 
WA_VLCVBAK_S_STR-WENAM_SD sy-vline 
WA_VLCVBAK_S_STR-KUNRE_SD sy-vline 
WA_VLCVBAK_S_STR-RENAM_SD sy-vline 
WA_VLCVBAK_S_STR-KUNRG_SD sy-vline 
WA_VLCVBAK_S_STR-RGNAM_SD sy-vline 
WA_VLCVBAK_S_STR-ANGDT sy-vline 
WA_VLCVBAK_S_STR-BNDDT sy-vline 
WA_VLCVBAK_S_STR-AUDAT sy-vline 
WA_VLCVBAK_S_STR-VBTYP sy-vline 
WA_VLCVBAK_S_STR-AUART sy-vline 
WA_VLCVBAK_S_STR-AUGRU sy-vline 
WA_VLCVBAK_S_STR-VSART sy-vline 
WA_VLCVBAK_S_STR-ABSTK sy-vline 
WA_VLCVBAK_S_STR-FAKSK sy-vline 
WA_VLCVBAK_S_STR-NETWR sy-vline 
WA_VLCVBAK_S_STR-WAERK sy-vline 
WA_VLCVBAK_S_STR-VKORG sy-vline 
WA_VLCVBAK_S_STR-VKORGTXT sy-vline 
WA_VLCVBAK_S_STR-VTWEG sy-vline 
WA_VLCVBAK_S_STR-VTWEGTXT sy-vline 
WA_VLCVBAK_S_STR-SPART sy-vline 
WA_VLCVBAK_S_STR-SPARTTXT sy-vline 
WA_VLCVBAK_S_STR-VKGRP sy-vline 
WA_VLCVBAK_S_STR-VKBUR sy-vline 
WA_VLCVBAK_S_STR-VDATU sy-vline 
WA_VLCVBAK_S_STR-BSTNK sy-vline 
WA_VLCVBAK_S_STR-BSTDK sy-vline 
WA_VLCVBAK_S_STR-ERDAT sy-vline 
WA_VLCVBAK_S_STR-ERDAT_SD sy-vline 
WA_VLCVBAK_S_STR-ERNAM_SD sy-vline 
WA_VLCVBAK_S_STR-AEDAT sy-vline 
WA_VLCVBAK_S_STR-UPD_TMSTMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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