ABAP Select data from SAP table REG30_ZW_I_E_VIRT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REG30_ZW_I_E_VIRT 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 REG30_ZW_I_E_VIRT. 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 REG30_ZW_I_E_VIRT 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_REG30_ZW_I_E_VIRT TYPE STANDARD TABLE OF REG30_ZW_I_E_VIRT,
      WA_REG30_ZW_I_E_VIRT TYPE REG30_ZW_I_E_VIRT,
      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: <REG30_ZW_I_E_VIRT> TYPE REG30_ZW_I_E_VIRT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REG30_ZW_I_E_VIRT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REG30_ZW_I_E_VIRT
  INTO TABLE IT_REG30_ZW_I_E_VIRT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REG30_ZW_I_E_VIRT
*  INTO TABLE @DATA(IT_REG30_ZW_I_E_VIRT2).
*--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_REG30_ZW_I_E_VIRT INDEX 1 INTO DATA(WA_REG30_ZW_I_E_VIRT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REG30_ZW_I_E_VIRT ASSIGNING <REG30_ZW_I_E_VIRT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REG30_ZW_I_E_VIRT>-SPARTYPE = 1.
<REG30_ZW_I_E_VIRT>-ZWTYPE = 1.
<REG30_ZW_I_E_VIRT>-BLIWIRKE = 1.
<REG30_ZW_I_E_VIRT>-ZWARTE = 1.
<REG30_ZW_I_E_VIRT>-ZWKENNE = 1.

ENDLOOP.

LOOP AT IT_REG30_ZW_I_E_VIRT INTO WA_REG30_ZW_I_E_VIRT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REG30_ZW_I_E_VIRT-THGBERE, sy-vline,
  WA_REG30_ZW_I_E_VIRT-MEINS, sy-vline,
  WA_REG30_ZW_I_E_VIRT-INTSIZEIDE, sy-vline,
  WA_REG30_ZW_I_E_VIRT-MASSREADE, sy-vline,
  WA_REG30_ZW_I_E_VIRT-KZMESSWE, sy-vline,
  WA_REG30_ZW_I_E_VIRT-STANZVORE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REG30_ZW_I_E_VIRT 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_REG30_ZW_I_E_VIRT 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_REG30_ZW_I_E_VIRT INTO WA_REG30_ZW_I_E_VIRT.


*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 LUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_LUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_I_E_VIRT-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_I_E_VIRT-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASSREADE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_I_E_VIRT-MASSREADE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_I_E_VIRT-MASSREADE.
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_REG30_ZW_I_E_VIRT_STR, 
SPARTYPE TYPE STRING,
ZWTYPE TYPE STRING,
BLIWIRKE TYPE STRING,
ZWARTE TYPE STRING,
ZWKENNE TYPE STRING,
THGBERE TYPE STRING,
MEINS TYPE STRING,
INTSIZEIDE TYPE STRING,
MASSREADE TYPE STRING,
KZMESSWE TYPE STRING,
STANZVORE TYPE STRING,
STANZNACE TYPE STRING,
UEBERVERE TYPE STRING,
ZWFAKTE TYPE STRING,
ZSPANNSE TYPE STRING,
ZSTROMSE TYPE STRING,
ZSPANNPE TYPE STRING,
ZSTROMPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REG30_ZW_I_E_VIRT_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_REG30_ZW_I_E_VIRT_STR-SPARTYPE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-ZWTYPE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-BLIWIRKE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-ZWARTE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-ZWKENNE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-THGBERE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-MEINS sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-INTSIZEIDE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-MASSREADE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-KZMESSWE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-STANZVORE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-STANZNACE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-UEBERVERE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-ZWFAKTE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-ZSPANNSE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-ZSTROMSE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-ZSPANNPE sy-vline 
WA_REG30_ZW_I_E_VIRT_STR-ZSTROMPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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