ABAP Select data from SAP table REG42_ZW into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP REG42_ZW 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 REG42_ZW. 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 REG42_ZW 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_REG42_ZW TYPE STANDARD TABLE OF REG42_ZW,
      WA_REG42_ZW TYPE REG42_ZW,
      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: <REG42_ZW> TYPE REG42_ZW.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REG42_ZW.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REG42_ZW
  INTO TABLE IT_REG42_ZW.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REG42_ZW
*  INTO TABLE @DATA(IT_REG42_ZW2).
*--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_REG42_ZW INDEX 1 INTO DATA(WA_REG42_ZW2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REG42_ZW ASSIGNING <REG42_ZW>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REG42_ZW>-MANDT = 1.
<REG42_ZW>-EQUNR = 1.
<REG42_ZW>-GERAET = 1.
<REG42_ZW>-MATNR = 1.
<REG42_ZW>-INT_UI = 1.

ENDLOOP.

LOOP AT IT_REG42_ZW INTO WA_REG42_ZW.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REG42_ZW-EXT_UI, sy-vline,
  WA_REG42_ZW-MORE_UI, sy-vline,
  WA_REG42_ZW-ZWNUMMER, sy-vline,
  WA_REG42_ZW-BIS, sy-vline,
  WA_REG42_ZW-AB, sy-vline,
  WA_REG42_ZW-LOGIKZW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REG42_ZW 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_REG42_ZW 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_REG42_ZW INTO WA_REG42_ZW.


*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 EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG42_ZW-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG42_ZW-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG42_ZW-GERAET
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG42_ZW-GERAET.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_REG42_ZW-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG42_ZW-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASSREAD
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG42_ZW-MASSREAD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG42_ZW-MASSREAD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASSBILL
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG42_ZW-MASSBILL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG42_ZW-MASSBILL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_LUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG42_ZW-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG42_ZW-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LUNIT, internal->external for field MASSBILLC6
CALL FUNCTION 'CONVERSION_EXIT_LUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG42_ZW-MASSBILLC6
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG42_ZW-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_REG42_ZW_STR, 
MANDT TYPE STRING,
EQUNR TYPE STRING,
GERAET TYPE STRING,
MATNR TYPE STRING,
INT_UI TYPE STRING,
EXT_UI TYPE STRING,
MORE_UI TYPE STRING,
ZWNUMMER TYPE STRING,
BIS TYPE STRING,
AB TYPE STRING,
LOGIKZW TYPE STRING,
LOGIKZW_OLD TYPE STRING,
LOGIKZW_MODE TYPE STRING,
MASSREAD TYPE STRING,
MASSBILL TYPE STRING,
NEW_ETDZ TYPE STRING,
ZWNABR TYPE STRING,
KENNZIFF TYPE STRING,
KZMESSW TYPE STRING,
STEUERGRP TYPE STRING,
LINE_MARK TYPE STRING,
ZWKENN TYPE STRING,
ZWART TYPE STRING,
STANZVOR TYPE STRING,
STANZNAC TYPE STRING,
ANZERG TYPE STRING,
UEBERVER TYPE STRING,
NABLESEN TYPE STRING,
ZWFAKT TYPE STRING,
PRUEFKL TYPE STRING,
TEMP_AREA TYPE STRING,
PR_AREA_AI TYPE STRING,
CALOR_AREA TYPE STRING,
HOEKORR TYPE STRING,
THGBER TYPE STRING,
KZAHLE TYPE STRING,
KZAHLT TYPE STRING,
GAS_PRS_AR TYPE STRING,
CRGPRESS TYPE STRING,
MEINS TYPE STRING,
ZSPANNS TYPE STRING,
ZSTROMS TYPE STRING,
ZSPANNP TYPE STRING,
ZSTROMP TYPE STRING,
GEWKEY TYPE STRING,
MASSBILLC6 TYPE STRING,
TOUPERIOD TYPE STRING,
BLIWIRK TYPE STRING,
SPARTYP TYPE STRING,
ZWTYP TYPE STRING,
INTSIZEID TYPE STRING,
VEE_CODE TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REG42_ZW_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_REG42_ZW_STR-MANDT sy-vline 
WA_REG42_ZW_STR-EQUNR sy-vline 
WA_REG42_ZW_STR-GERAET sy-vline 
WA_REG42_ZW_STR-MATNR sy-vline 
WA_REG42_ZW_STR-INT_UI sy-vline 
WA_REG42_ZW_STR-EXT_UI sy-vline 
WA_REG42_ZW_STR-MORE_UI sy-vline 
WA_REG42_ZW_STR-ZWNUMMER sy-vline 
WA_REG42_ZW_STR-BIS sy-vline 
WA_REG42_ZW_STR-AB sy-vline 
WA_REG42_ZW_STR-LOGIKZW sy-vline 
WA_REG42_ZW_STR-LOGIKZW_OLD sy-vline 
WA_REG42_ZW_STR-LOGIKZW_MODE sy-vline 
WA_REG42_ZW_STR-MASSREAD sy-vline 
WA_REG42_ZW_STR-MASSBILL sy-vline 
WA_REG42_ZW_STR-NEW_ETDZ sy-vline 
WA_REG42_ZW_STR-ZWNABR sy-vline 
WA_REG42_ZW_STR-KENNZIFF sy-vline 
WA_REG42_ZW_STR-KZMESSW sy-vline 
WA_REG42_ZW_STR-STEUERGRP sy-vline 
WA_REG42_ZW_STR-LINE_MARK sy-vline 
WA_REG42_ZW_STR-ZWKENN sy-vline 
WA_REG42_ZW_STR-ZWART sy-vline 
WA_REG42_ZW_STR-STANZVOR sy-vline 
WA_REG42_ZW_STR-STANZNAC sy-vline 
WA_REG42_ZW_STR-ANZERG sy-vline 
WA_REG42_ZW_STR-UEBERVER sy-vline 
WA_REG42_ZW_STR-NABLESEN sy-vline 
WA_REG42_ZW_STR-ZWFAKT sy-vline 
WA_REG42_ZW_STR-PRUEFKL sy-vline 
WA_REG42_ZW_STR-TEMP_AREA sy-vline 
WA_REG42_ZW_STR-PR_AREA_AI sy-vline 
WA_REG42_ZW_STR-CALOR_AREA sy-vline 
WA_REG42_ZW_STR-HOEKORR sy-vline 
WA_REG42_ZW_STR-THGBER sy-vline 
WA_REG42_ZW_STR-KZAHLE sy-vline 
WA_REG42_ZW_STR-KZAHLT sy-vline 
WA_REG42_ZW_STR-GAS_PRS_AR sy-vline 
WA_REG42_ZW_STR-CRGPRESS sy-vline 
WA_REG42_ZW_STR-MEINS sy-vline 
WA_REG42_ZW_STR-ZSPANNS sy-vline 
WA_REG42_ZW_STR-ZSTROMS sy-vline 
WA_REG42_ZW_STR-ZSPANNP sy-vline 
WA_REG42_ZW_STR-ZSTROMP sy-vline 
WA_REG42_ZW_STR-GEWKEY sy-vline 
WA_REG42_ZW_STR-MASSBILLC6 sy-vline 
WA_REG42_ZW_STR-TOUPERIOD sy-vline 
WA_REG42_ZW_STR-BLIWIRK sy-vline 
WA_REG42_ZW_STR-SPARTYP sy-vline 
WA_REG42_ZW_STR-ZWTYP sy-vline 
WA_REG42_ZW_STR-INTSIZEID sy-vline 
WA_REG42_ZW_STR-VEE_CODE sy-vline 
WA_REG42_ZW_STR-ERDAT sy-vline 
WA_REG42_ZW_STR-ERNAM sy-vline 
WA_REG42_ZW_STR-AEDAT sy-vline 
WA_REG42_ZW_STR-AENAM sy-vline      INTO ld_text SEPARATED BY SPACE.

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