ABAP Select data from SAP table VEZWG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VEZWG
*  INTO TABLE @DATA(IT_VEZWG2).
*--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_VEZWG INDEX 1 INTO DATA(WA_VEZWG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VEZWG>-MANDT = 1.
<VEZWG>-ZWGRUPPE = 1.
<VEZWG>-ZWNUMMER = 1.
<VEZWG>-LOESCHVM = 1.
<VEZWG>-BEGRU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VEZWG-SPARTYP, sy-vline,
  WA_VEZWG-ZWART, sy-vline,
  WA_VEZWG-BLIWIRK, sy-vline,
  WA_VEZWG-ZWTYP, sy-vline,
  WA_VEZWG-STANZVOR, sy-vline,
  WA_VEZWG-STANZNAC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VEZWG 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_VEZWG 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_VEZWG INTO WA_VEZWG.


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

*Conversion exit CUNIT, internal->external for field MASSREAD
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VEZWG-MASSREAD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VEZWG-MASSREAD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASSBILL
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VEZWG-MASSBILL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VEZWG-MASSBILL.
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_VEZWG_STR, 
MANDT TYPE STRING,
ZWGRUPPE TYPE STRING,
ZWNUMMER TYPE STRING,
LOESCHVM TYPE STRING,
BEGRU TYPE STRING,
SPARTYP TYPE STRING,
ZWART TYPE STRING,
BLIWIRK TYPE STRING,
ZWTYP TYPE STRING,
STANZVOR TYPE STRING,
STANZNAC TYPE STRING,
ZWFAKT TYPE STRING,
MASSREAD TYPE STRING,
THGBER TYPE STRING,
ZWKENN TYPE STRING,
UEBERVER TYPE STRING,
ZSPANNP TYPE STRING,
ZSPANNS TYPE STRING,
ZSTROMP TYPE STRING,
ZSTROMS TYPE STRING,
ANZERG TYPE STRING,
ZWNABR TYPE STRING,
ANZART TYPE STRING,
KENNZIFF TYPE STRING,
SUCHBEG TYPE STRING,
ZWINFO TYPE STRING,
KZMESSW TYPE STRING,
STEUERGRP TYPE STRING,
KZDEFAULT TYPE STRING,
PRUEFKL TYPE STRING,
NABLESEN TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
MASSBILL TYPE STRING,
GEWKEY TYPE STRING,
INTSIZEID TYPE STRING,
TOUPERIOD TYPE STRING,
VEE_CODE TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VEZWG_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_VEZWG_STR-MANDT sy-vline 
WA_VEZWG_STR-ZWGRUPPE sy-vline 
WA_VEZWG_STR-ZWNUMMER sy-vline 
WA_VEZWG_STR-LOESCHVM sy-vline 
WA_VEZWG_STR-BEGRU sy-vline 
WA_VEZWG_STR-SPARTYP sy-vline 
WA_VEZWG_STR-ZWART sy-vline 
WA_VEZWG_STR-BLIWIRK sy-vline 
WA_VEZWG_STR-ZWTYP sy-vline 
WA_VEZWG_STR-STANZVOR sy-vline 
WA_VEZWG_STR-STANZNAC sy-vline 
WA_VEZWG_STR-ZWFAKT sy-vline 
WA_VEZWG_STR-MASSREAD sy-vline 
WA_VEZWG_STR-THGBER sy-vline 
WA_VEZWG_STR-ZWKENN sy-vline 
WA_VEZWG_STR-UEBERVER sy-vline 
WA_VEZWG_STR-ZSPANNP sy-vline 
WA_VEZWG_STR-ZSPANNS sy-vline 
WA_VEZWG_STR-ZSTROMP sy-vline 
WA_VEZWG_STR-ZSTROMS sy-vline 
WA_VEZWG_STR-ANZERG sy-vline 
WA_VEZWG_STR-ZWNABR sy-vline 
WA_VEZWG_STR-ANZART sy-vline 
WA_VEZWG_STR-KENNZIFF sy-vline 
WA_VEZWG_STR-SUCHBEG sy-vline 
WA_VEZWG_STR-ZWINFO sy-vline 
WA_VEZWG_STR-KZMESSW sy-vline 
WA_VEZWG_STR-STEUERGRP sy-vline 
WA_VEZWG_STR-KZDEFAULT sy-vline 
WA_VEZWG_STR-PRUEFKL sy-vline 
WA_VEZWG_STR-NABLESEN sy-vline 
WA_VEZWG_STR-ERDAT sy-vline 
WA_VEZWG_STR-ERNAM sy-vline 
WA_VEZWG_STR-AEDAT sy-vline 
WA_VEZWG_STR-AENAM sy-vline 
WA_VEZWG_STR-MASSBILL sy-vline 
WA_VEZWG_STR-GEWKEY sy-vline 
WA_VEZWG_STR-INTSIZEID sy-vline 
WA_VEZWG_STR-TOUPERIOD sy-vline 
WA_VEZWG_STR-VEE_CODE sy-vline 
WA_VEZWG_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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