ABAP Select data from SAP table VVZWDVL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VVZWDVL
*  INTO TABLE @DATA(IT_VVZWDVL2).
*--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_VVZWDVL INDEX 1 INTO DATA(WA_VVZWDVL2).


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

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

ENDLOOP.

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

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


*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_VVZWDVL_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,END OF T_EKKO_STR.
DATA: WA_VVZWDVL_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_VVZWDVL_STR-MANDT sy-vline 
WA_VVZWDVL_STR-RANTYP sy-vline 
WA_VVZWDVL_STR-SARBG sy-vline 
WA_VVZWDVL_STR-SCHL1 sy-vline 
WA_VVZWDVL_STR-SCHL2 sy-vline 
WA_VVZWDVL_STR-SCHL3 sy-vline 
WA_VVZWDVL_STR-SCHL4 sy-vline 
WA_VVZWDVL_STR-RECNAM sy-vline 
WA_VVZWDVL_STR-DWVSND sy-vline 
WA_VVZWDVL_STR-DWVEIN sy-vline 
WA_VVZWDVL_STR-OBJTP sy-vline 
WA_VVZWDVL_STR-OBJYR sy-vline 
WA_VVZWDVL_STR-OBJNO sy-vline 
WA_VVZWDVL_STR-BEKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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