ABAP Select data from SAP table EZWGD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EZWGD
*  INTO TABLE @DATA(IT_EZWGD2).
*--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_EZWGD INDEX 1 INTO DATA(WA_EZWGD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EZWGD>-MANDT = 1.
<EZWGD>-ZWGRUPPE = 1.
<EZWGD>-ZWNUMMER = 1.
<EZWGD>-SPARTYP = 1.
<EZWGD>-ZWART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EZWGD-BLIWIRK, sy-vline,
  WA_EZWGD-ZWTYP, sy-vline,
  WA_EZWGD-STANZVOR, sy-vline,
  WA_EZWGD-STANZNAC, sy-vline,
  WA_EZWGD-ZWFAKT, sy-vline,
  WA_EZWGD-MASSREAD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EZWGD 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_EZWGD 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_EZWGD INTO WA_EZWGD.


*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_EZWGD-ZWGRUPPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EZWGD-ZWGRUPPE.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit LUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_LUNIT_OUTPUT'
  EXPORTING
    input =                      WA_EZWGD-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EZWGD-MEINS.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit LUNIT, internal->external for field MASSBILLC6
CALL FUNCTION 'CONVERSION_EXIT_LUNIT_OUTPUT'
  EXPORTING
    input =                      WA_EZWGD-MASSBILLC6
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EZWGD-MASSBILLC6.
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_EZWGD_STR, 
MANDT TYPE STRING,
ZWGRUPPE TYPE STRING,
ZWNUMMER 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,
MEINS 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,
ZWINFO TYPE STRING,
KZMESSW TYPE STRING,
STEUERGRP TYPE STRING,
KZDEFAULT TYPE STRING,
PRUEFKL TYPE STRING,
NABLESEN TYPE STRING,
KZ_ETDZ TYPE STRING,
MASSBILL TYPE STRING,
MASSBILLC6 TYPE STRING,
GEWKEY TYPE STRING,
INTSIZEID TYPE STRING,
TOUPERIOD TYPE STRING,
VEE_CODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EZWGD_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_EZWGD_STR-MANDT sy-vline 
WA_EZWGD_STR-ZWGRUPPE sy-vline 
WA_EZWGD_STR-ZWNUMMER sy-vline 
WA_EZWGD_STR-SPARTYP sy-vline 
WA_EZWGD_STR-ZWART sy-vline 
WA_EZWGD_STR-BLIWIRK sy-vline 
WA_EZWGD_STR-ZWTYP sy-vline 
WA_EZWGD_STR-STANZVOR sy-vline 
WA_EZWGD_STR-STANZNAC sy-vline 
WA_EZWGD_STR-ZWFAKT sy-vline 
WA_EZWGD_STR-MASSREAD sy-vline 
WA_EZWGD_STR-MEINS sy-vline 
WA_EZWGD_STR-THGBER sy-vline 
WA_EZWGD_STR-ZWKENN sy-vline 
WA_EZWGD_STR-UEBERVER sy-vline 
WA_EZWGD_STR-ZSPANNP sy-vline 
WA_EZWGD_STR-ZSPANNS sy-vline 
WA_EZWGD_STR-ZSTROMP sy-vline 
WA_EZWGD_STR-ZSTROMS sy-vline 
WA_EZWGD_STR-ANZERG sy-vline 
WA_EZWGD_STR-ZWNABR sy-vline 
WA_EZWGD_STR-ANZART sy-vline 
WA_EZWGD_STR-KENNZIFF sy-vline 
WA_EZWGD_STR-ZWINFO sy-vline 
WA_EZWGD_STR-KZMESSW sy-vline 
WA_EZWGD_STR-STEUERGRP sy-vline 
WA_EZWGD_STR-KZDEFAULT sy-vline 
WA_EZWGD_STR-PRUEFKL sy-vline 
WA_EZWGD_STR-NABLESEN sy-vline 
WA_EZWGD_STR-KZ_ETDZ sy-vline 
WA_EZWGD_STR-MASSBILL sy-vline 
WA_EZWGD_STR-MASSBILLC6 sy-vline 
WA_EZWGD_STR-GEWKEY sy-vline 
WA_EZWGD_STR-INTSIZEID sy-vline 
WA_EZWGD_STR-TOUPERIOD sy-vline 
WA_EZWGD_STR-VEE_CODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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