ABAP Select data from SAP table REBDC_LOC_SYSTEM_DESC 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_DESC 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_DESC. 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_DESC 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_DESC TYPE STANDARD TABLE OF REBDC_LOC_SYSTEM_DESC,
      WA_REBDC_LOC_SYSTEM_DESC TYPE REBDC_LOC_SYSTEM_DESC,
      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_DESC> TYPE REBDC_LOC_SYSTEM_DESC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REBDC_LOC_SYSTEM_DESC
*  INTO TABLE @DATA(IT_REBDC_LOC_SYSTEM_DESC2).
*--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_DESC INDEX 1 INTO DATA(WA_REBDC_LOC_SYSTEM_DESC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REBDC_LOC_SYSTEM_DESC>-LOCSYS = 1.
<REBDC_LOC_SYSTEM_DESC>-LOCLEVEL = 1.
<REBDC_LOC_SYSTEM_DESC>-LOCITEM = 1.
<REBDC_LOC_SYSTEM_DESC>-XLOCITEM01 = 1.
<REBDC_LOC_SYSTEM_DESC>-XLOCITEM02 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REBDC_LOC_SYSTEM_DESC-XLOCITEM03, sy-vline,
  WA_REBDC_LOC_SYSTEM_DESC-XLOCITEM04, sy-vline,
  WA_REBDC_LOC_SYSTEM_DESC-XLOCITEM05, sy-vline,
  WA_REBDC_LOC_SYSTEM_DESC-XLOCITEM06, sy-vline,
  WA_REBDC_LOC_SYSTEM_DESC-XLOCITEM07, sy-vline,
  WA_REBDC_LOC_SYSTEM_DESC-XLOCITEM08, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REBDC_LOC_SYSTEM_DESC 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_DESC 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_DESC INTO WA_REBDC_LOC_SYSTEM_DESC.


*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.
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_DESC_STR, 
LOCSYS TYPE STRING,
LOCLEVEL TYPE STRING,
LOCITEM TYPE STRING,
XLOCITEM01 TYPE STRING,
XLOCITEM02 TYPE STRING,
XLOCITEM03 TYPE STRING,
XLOCITEM04 TYPE STRING,
XLOCITEM05 TYPE STRING,
XLOCITEM06 TYPE STRING,
XLOCITEM07 TYPE STRING,
XLOCITEM08 TYPE STRING,
XLOCITEM09 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REBDC_LOC_SYSTEM_DESC_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_DESC_STR-LOCSYS sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-LOCLEVEL sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-LOCITEM sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM01 sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM02 sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM03 sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM04 sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM05 sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM06 sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM07 sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM08 sy-vline 
WA_REBDC_LOC_SYSTEM_DESC_STR-XLOCITEM09 sy-vline      INTO ld_text SEPARATED BY SPACE.

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