ABAP Select data from SAP table REG30_ZW_I 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 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. 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 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 TYPE STANDARD TABLE OF REG30_ZW_I,
      WA_REG30_ZW_I TYPE REG30_ZW_I,
      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> TYPE REG30_ZW_I.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REG30_ZW_I.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REG30_ZW_I
  INTO TABLE IT_REG30_ZW_I.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REG30_ZW_I
*  INTO TABLE @DATA(IT_REG30_ZW_I2).
*--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 INDEX 1 INTO DATA(WA_REG30_ZW_I2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REG30_ZW_I ASSIGNING <REG30_ZW_I>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REG30_ZW_I>-KONDIGRE = 1.
<REG30_ZW_I>-ZWSTANDCE = 1.
<REG30_ZW_I>-THGVER = 1.
<REG30_ZW_I>-FESTTEMP = 1.
<REG30_ZW_I>-ZUSZAHLZWE = 1.

ENDLOOP.

LOOP AT IT_REG30_ZW_I INTO WA_REG30_ZW_I.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REG30_ZW_I-STEUERGRPE, sy-vline,
  WA_REG30_ZW_I-PROFESTE, sy-vline,
  WA_REG30_ZW_I-PROPROZE, sy-vline,
  WA_REG30_ZW_I-ZEITRAUME, sy-vline,
  WA_REG30_ZW_I-RABZUSE, sy-vline,
  WA_REG30_ZW_I-ANZERG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REG30_ZW_I 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 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 INTO WA_REG30_ZW_I.


*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 RABZUSE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_I-RABZUSE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_I-RABZUSE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PREISKLAE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_I-PREISKLAE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_I-PREISKLAE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASSBILLE
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_I-MASSBILLE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_I-MASSBILLE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_LUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_I-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_I-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-MASSREADE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_I-MASSREADE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LUNIT, internal->external for field MASSBILLC6E
CALL FUNCTION 'CONVERSION_EXIT_LUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_I-MASSBILLC6E
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_I-MASSBILLC6E.
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_STR, 
KONDIGRE TYPE STRING,
ZWSTANDCE TYPE STRING,
THGVER TYPE STRING,
FESTTEMP TYPE STRING,
ZUSZAHLZWE TYPE STRING,
STEUERGRPE TYPE STRING,
PROFESTE TYPE STRING,
PROPROZE TYPE STRING,
ZEITRAUME TYPE STRING,
RABZUSE TYPE STRING,
ANZERG TYPE STRING,
ZWNABR TYPE STRING,
PREISKLAE TYPE STRING,
TARIFART TYPE STRING,
ANZDAYSOFPERIOD TYPE STRING,
PERVERBR TYPE STRING,
GVERRECH TYPE STRING,
KENNZIFFE TYPE STRING,
ZWZUORD TYPE STRING,
TEMP_AREA TYPE STRING,
PR_AREA_AI TYPE STRING,
CALOR_AREA TYPE STRING,
HOEKORR TYPE STRING,
KZAHLE TYPE STRING,
KZAHLT TYPE STRING,
GAS_PRS_AR TYPE STRING,
CRGPRESS TYPE STRING,
ABRFAKTE TYPE STRING,
NABLESENE TYPE STRING,
MASSBILLE TYPE STRING,
GEWKEYE TYPE STRING,
PRUEFKLE TYPE STRING,
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,
MASSBILLC6E TYPE STRING,
TOUPERIODE TYPE STRING,
ZWNSETTLE TYPE STRING,
VEE_CODEE TYPE STRING,
ZWSTANDCA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REG30_ZW_I_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_STR-KONDIGRE sy-vline 
WA_REG30_ZW_I_STR-ZWSTANDCE sy-vline 
WA_REG30_ZW_I_STR-THGVER sy-vline 
WA_REG30_ZW_I_STR-FESTTEMP sy-vline 
WA_REG30_ZW_I_STR-ZUSZAHLZWE sy-vline 
WA_REG30_ZW_I_STR-STEUERGRPE sy-vline 
WA_REG30_ZW_I_STR-PROFESTE sy-vline 
WA_REG30_ZW_I_STR-PROPROZE sy-vline 
WA_REG30_ZW_I_STR-ZEITRAUME sy-vline 
WA_REG30_ZW_I_STR-RABZUSE sy-vline 
WA_REG30_ZW_I_STR-ANZERG sy-vline 
WA_REG30_ZW_I_STR-ZWNABR sy-vline 
WA_REG30_ZW_I_STR-PREISKLAE sy-vline 
WA_REG30_ZW_I_STR-TARIFART sy-vline 
WA_REG30_ZW_I_STR-ANZDAYSOFPERIOD sy-vline 
WA_REG30_ZW_I_STR-PERVERBR sy-vline 
WA_REG30_ZW_I_STR-GVERRECH sy-vline 
WA_REG30_ZW_I_STR-KENNZIFFE sy-vline 
WA_REG30_ZW_I_STR-ZWZUORD sy-vline 
WA_REG30_ZW_I_STR-TEMP_AREA sy-vline 
WA_REG30_ZW_I_STR-PR_AREA_AI sy-vline 
WA_REG30_ZW_I_STR-CALOR_AREA sy-vline 
WA_REG30_ZW_I_STR-HOEKORR sy-vline 
WA_REG30_ZW_I_STR-KZAHLE sy-vline 
WA_REG30_ZW_I_STR-KZAHLT sy-vline 
WA_REG30_ZW_I_STR-GAS_PRS_AR sy-vline 
WA_REG30_ZW_I_STR-CRGPRESS sy-vline 
WA_REG30_ZW_I_STR-ABRFAKTE sy-vline 
WA_REG30_ZW_I_STR-NABLESENE sy-vline 
WA_REG30_ZW_I_STR-MASSBILLE sy-vline 
WA_REG30_ZW_I_STR-GEWKEYE sy-vline 
WA_REG30_ZW_I_STR-PRUEFKLE sy-vline 
WA_REG30_ZW_I_STR-SPARTYPE sy-vline 
WA_REG30_ZW_I_STR-ZWTYPE sy-vline 
WA_REG30_ZW_I_STR-BLIWIRKE sy-vline 
WA_REG30_ZW_I_STR-ZWARTE sy-vline 
WA_REG30_ZW_I_STR-ZWKENNE sy-vline 
WA_REG30_ZW_I_STR-THGBERE sy-vline 
WA_REG30_ZW_I_STR-MEINS sy-vline 
WA_REG30_ZW_I_STR-INTSIZEIDE sy-vline 
WA_REG30_ZW_I_STR-MASSREADE sy-vline 
WA_REG30_ZW_I_STR-KZMESSWE sy-vline 
WA_REG30_ZW_I_STR-STANZVORE sy-vline 
WA_REG30_ZW_I_STR-STANZNACE sy-vline 
WA_REG30_ZW_I_STR-UEBERVERE sy-vline 
WA_REG30_ZW_I_STR-ZWFAKTE sy-vline 
WA_REG30_ZW_I_STR-ZSPANNSE sy-vline 
WA_REG30_ZW_I_STR-ZSTROMSE sy-vline 
WA_REG30_ZW_I_STR-ZSPANNPE sy-vline 
WA_REG30_ZW_I_STR-ZSTROMPE sy-vline 
WA_REG30_ZW_I_STR-MASSBILLC6E sy-vline 
WA_REG30_ZW_I_STR-TOUPERIODE sy-vline 
WA_REG30_ZW_I_STR-ZWNSETTLE sy-vline 
WA_REG30_ZW_I_STR-VEE_CODEE sy-vline 
WA_REG30_ZW_I_STR-ZWSTANDCA sy-vline      INTO ld_text SEPARATED BY SPACE.

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