ABAP Select data from SAP table REBDC_LOC_SYSTEM_X into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REBDC_LOC_SYSTEM_X
*  INTO TABLE @DATA(IT_REBDC_LOC_SYSTEM_X2).
*--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_REBDC_LOC_SYSTEM_X INDEX 1 INTO DATA(WA_REBDC_LOC_SYSTEM_X2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REBDC_LOC_SYSTEM_X>-MANDT = 1.
<REBDC_LOC_SYSTEM_X>-LOCSYS = 1.
<REBDC_LOC_SYSTEM_X>-LOCLEVELCNT = 1.
<REBDC_LOC_SYSTEM_X>-SPRAS = 1.
<REBDC_LOC_SYSTEM_X>-XLOCSYS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REBDC_LOC_SYSTEM_X-XLOCLEVEL01, sy-vline,
  WA_REBDC_LOC_SYSTEM_X-XLOCLEVEL02, sy-vline,
  WA_REBDC_LOC_SYSTEM_X-XLOCLEVEL03, sy-vline,
  WA_REBDC_LOC_SYSTEM_X-XLOCLEVEL04, sy-vline,
  WA_REBDC_LOC_SYSTEM_X-XLOCLEVEL05, sy-vline,
  WA_REBDC_LOC_SYSTEM_X-XLOCLEVEL06, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REBDC_LOC_SYSTEM_X 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_REBDC_LOC_SYSTEM_X 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_REBDC_LOC_SYSTEM_X INTO WA_REBDC_LOC_SYSTEM_X.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_REBDC_LOC_SYSTEM_X-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REBDC_LOC_SYSTEM_X-SPRAS.
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_REBDC_LOC_SYSTEM_X_STR, 
MANDT TYPE STRING,
LOCSYS TYPE STRING,
LOCLEVELCNT TYPE STRING,
SPRAS TYPE STRING,
XLOCSYS TYPE STRING,
XLOCLEVEL01 TYPE STRING,
XLOCLEVEL02 TYPE STRING,
XLOCLEVEL03 TYPE STRING,
XLOCLEVEL04 TYPE STRING,
XLOCLEVEL05 TYPE STRING,
XLOCLEVEL06 TYPE STRING,
XLOCLEVEL07 TYPE STRING,
XLOCLEVEL08 TYPE STRING,
XLOCLEVEL09 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REBDC_LOC_SYSTEM_X_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_REBDC_LOC_SYSTEM_X_STR-MANDT sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-LOCSYS sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-LOCLEVELCNT sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-SPRAS sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCSYS sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL01 sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL02 sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL03 sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL04 sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL05 sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL06 sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL07 sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL08 sy-vline 
WA_REBDC_LOC_SYSTEM_X_STR-XLOCLEVEL09 sy-vline      INTO ld_text SEPARATED BY SPACE.

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