ABAP Select data from SAP table V_WLFZB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_WLFZB
*  INTO TABLE @DATA(IT_V_WLFZB2).
*--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_V_WLFZB INDEX 1 INTO DATA(WA_V_WLFZB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_WLFZB>-MANDT = 1.
<V_WLFZB>-WBELN = 1.
<V_WLFZB>-WRART = 1.
<V_WLFZB>-WFDAT = 1.
<V_WLFZB>-LNRZB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_WLFZB-KUNRG, sy-vline,
  WA_V_WLFZB-EKORG, sy-vline,
  WA_V_WLFZB-VKORG, sy-vline,
  WA_V_WLFZB-VTWEG, sy-vline,
  WA_V_WLFZB-SPART, sy-vline,
  WA_V_WLFZB-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_WLFZB 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_V_WLFZB 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_V_WLFZB INTO WA_V_WLFZB.


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

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

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

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

*Conversion exit ALPHA, internal->external for field KUNRE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_WLFZB-KUNRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_WLFZB-KUNRE.
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_V_WLFZB_STR, 
MANDT TYPE STRING,
WBELN TYPE STRING,
WRART TYPE STRING,
WFDAT TYPE STRING,
LNRZB TYPE STRING,
KUNRG TYPE STRING,
EKORG TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
BUKRS TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
EKGRP TYPE STRING,
LIFRE TYPE STRING,
KUNRE TYPE STRING,
XBLNR TYPE STRING,
ZUONR TYPE STRING,
BLDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_WLFZB_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_V_WLFZB_STR-MANDT sy-vline 
WA_V_WLFZB_STR-WBELN sy-vline 
WA_V_WLFZB_STR-WRART sy-vline 
WA_V_WLFZB_STR-WFDAT sy-vline 
WA_V_WLFZB_STR-LNRZB sy-vline 
WA_V_WLFZB_STR-KUNRG sy-vline 
WA_V_WLFZB_STR-EKORG sy-vline 
WA_V_WLFZB_STR-VKORG sy-vline 
WA_V_WLFZB_STR-VTWEG sy-vline 
WA_V_WLFZB_STR-SPART sy-vline 
WA_V_WLFZB_STR-BUKRS sy-vline 
WA_V_WLFZB_STR-ERDAT sy-vline 
WA_V_WLFZB_STR-ERNAM sy-vline 
WA_V_WLFZB_STR-EKGRP sy-vline 
WA_V_WLFZB_STR-LIFRE sy-vline 
WA_V_WLFZB_STR-KUNRE sy-vline 
WA_V_WLFZB_STR-XBLNR sy-vline 
WA_V_WLFZB_STR-ZUONR sy-vline 
WA_V_WLFZB_STR-BLDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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