ABAP Select data from SAP table REXC_CH_CATASTER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REXC_CH_CATASTER
*  INTO TABLE @DATA(IT_REXC_CH_CATASTER2).
*--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_REXC_CH_CATASTER INDEX 1 INTO DATA(WA_REXC_CH_CATASTER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REXC_CH_CATASTER>-INTRENO = 1.
<REXC_CH_CATASTER>-PARCEL = 1.
<REXC_CH_CATASTER>-CADASTER = 1.
<REXC_CH_CATASTER>-LRREGSUBNO = 1.
<REXC_CH_CATASTER>-VALIDTO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REXC_CH_CATASTER-ADMINVALUE, sy-vline,
  WA_REXC_CH_CATASTER-CURRENCY, sy-vline,
  WA_REXC_CH_CATASTER-VALIDFROM, sy-vline,
  WA_REXC_CH_CATASTER-XOBJECT, sy-vline,
  WA_REXC_CH_CATASTER-XCATASTER, sy-vline,
  WA_REXC_CH_CATASTER-TITLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REXC_CH_CATASTER 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_REXC_CH_CATASTER 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_REXC_CH_CATASTER INTO WA_REXC_CH_CATASTER.


*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 REDAT, internal->external for field VALIDTO
CALL FUNCTION 'CONVERSION_EXIT_REDAT_OUTPUT'
  EXPORTING
    input =                      WA_REXC_CH_CATASTER-VALIDTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXC_CH_CATASTER-VALIDTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LRREG, internal->external for field LRREGNO
CALL FUNCTION 'CONVERSION_EXIT_LRREG_OUTPUT'
  EXPORTING
    input =                      WA_REXC_CH_CATASTER-LRREGNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXC_CH_CATASTER-LRREGNO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SGENR, internal->external for field CATBUILDINGNO
CALL FUNCTION 'CONVERSION_EXIT_SGENR_OUTPUT'
  EXPORTING
    input =                      WA_REXC_CH_CATASTER-CATBUILDINGNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REXC_CH_CATASTER-CATBUILDINGNO.
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_REXC_CH_CATASTER_STR, 
INTRENO TYPE STRING,
PARCEL TYPE STRING,
CADASTER TYPE STRING,
LRREGSUBNO TYPE STRING,
VALIDTO TYPE STRING,
ADMINVALUE TYPE STRING,
CURRENCY TYPE STRING,
VALIDFROM TYPE STRING,
XOBJECT TYPE STRING,
XCATASTER TYPE STRING,
TITLE TYPE STRING,
LRREGNO TYPE STRING,
CATAREA TYPE STRING,
CATBUILDINGNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REXC_CH_CATASTER_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_REXC_CH_CATASTER_STR-INTRENO sy-vline 
WA_REXC_CH_CATASTER_STR-PARCEL sy-vline 
WA_REXC_CH_CATASTER_STR-CADASTER sy-vline 
WA_REXC_CH_CATASTER_STR-LRREGSUBNO sy-vline 
WA_REXC_CH_CATASTER_STR-VALIDTO sy-vline 
WA_REXC_CH_CATASTER_STR-ADMINVALUE sy-vline 
WA_REXC_CH_CATASTER_STR-CURRENCY sy-vline 
WA_REXC_CH_CATASTER_STR-VALIDFROM sy-vline 
WA_REXC_CH_CATASTER_STR-XOBJECT sy-vline 
WA_REXC_CH_CATASTER_STR-XCATASTER sy-vline 
WA_REXC_CH_CATASTER_STR-TITLE sy-vline 
WA_REXC_CH_CATASTER_STR-LRREGNO sy-vline 
WA_REXC_CH_CATASTER_STR-CATAREA sy-vline 
WA_REXC_CH_CATASTER_STR-CATBUILDINGNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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