ABAP Select data from SAP table VZWDVL into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VZWDVL
*  INTO TABLE @DATA(IT_VZWDVL2).
*--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_VZWDVL INDEX 1 INTO DATA(WA_VZWDVL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VZWDVL>-MANDT = 1.
<VZWDVL>-RANTYP = 1.
<VZWDVL>-SARBG = 1.
<VZWDVL>-SCHL1 = 1.
<VZWDVL>-SCHL2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VZWDVL-SCHL3, sy-vline,
  WA_VZWDVL-SCHL4, sy-vline,
  WA_VZWDVL-RECNAM, sy-vline,
  WA_VZWDVL-DWVSND, sy-vline,
  WA_VZWDVL-DWVEIN, sy-vline,
  WA_VZWDVL-OBJTP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VZWDVL 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_VZWDVL 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_VZWDVL INTO WA_VZWDVL.


*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_VZWDVL_STR, 
MANDT TYPE STRING,
RANTYP TYPE STRING,
SARBG TYPE STRING,
SCHL1 TYPE STRING,
SCHL2 TYPE STRING,
SCHL3 TYPE STRING,
SCHL4 TYPE STRING,
RECNAM TYPE STRING,
DWVSND TYPE STRING,
DWVEIN TYPE STRING,
OBJTP TYPE STRING,
OBJYR TYPE STRING,
OBJNO TYPE STRING,
BEKZ TYPE STRING,
DATUM1 TYPE STRING,
DATUM2 TYPE STRING,
TEXT1 TYPE STRING,
TEXT2 TYPE STRING,
TEXT3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VZWDVL_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_VZWDVL_STR-MANDT sy-vline 
WA_VZWDVL_STR-RANTYP sy-vline 
WA_VZWDVL_STR-SARBG sy-vline 
WA_VZWDVL_STR-SCHL1 sy-vline 
WA_VZWDVL_STR-SCHL2 sy-vline 
WA_VZWDVL_STR-SCHL3 sy-vline 
WA_VZWDVL_STR-SCHL4 sy-vline 
WA_VZWDVL_STR-RECNAM sy-vline 
WA_VZWDVL_STR-DWVSND sy-vline 
WA_VZWDVL_STR-DWVEIN sy-vline 
WA_VZWDVL_STR-OBJTP sy-vline 
WA_VZWDVL_STR-OBJYR sy-vline 
WA_VZWDVL_STR-OBJNO sy-vline 
WA_VZWDVL_STR-BEKZ sy-vline 
WA_VZWDVL_STR-DATUM1 sy-vline 
WA_VZWDVL_STR-DATUM2 sy-vline 
WA_VZWDVL_STR-TEXT1 sy-vline 
WA_VZWDVL_STR-TEXT2 sy-vline 
WA_VZWDVL_STR-TEXT3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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