ABAP Select data from SAP table REORC_RESERVATION_SETTINGS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REORC_RESERVATION_SETTINGS
*  INTO TABLE @DATA(IT_REORC_RESERVATION_SETTINGS2).
*--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_REORC_RESERVATION_SETTINGS INDEX 1 INTO DATA(WA_REORC_RESERVATION_SETTINGS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REORC_RESERVATION_SETTINGS>-MANDT = 1.
<REORC_RESERVATION_SETTINGS>-RSAREA = 1.
<REORC_RESERVATION_SETTINGS>-RSOBJTYPE = 1.
<REORC_RESERVATION_SETTINGS>-RSTYPE = 1.
<REORC_RESERVATION_SETTINGS>-REVERSALEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REORC_RESERVATION_SETTINGS-REVERSALINT, sy-vline,
  WA_REORC_RESERVATION_SETTINGS-OPACTCN, sy-vline,
  WA_REORC_RESERVATION_SETTINGS-OPACTCPD, sy-vline,
  WA_REORC_RESERVATION_SETTINGS-ISRESPONSIBLEUSE, sy-vline,
  WA_REORC_RESERVATION_SETTINGS-ISOCCUPANTUSER, sy-vline,
  WA_REORC_RESERVATION_SETTINGS-INVOICE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REORC_RESERVATION_SETTINGS 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_REORC_RESERVATION_SETTINGS 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_REORC_RESERVATION_SETTINGS INTO WA_REORC_RESERVATION_SETTINGS.


*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_REORC_RESERVATION_SETTINGS_STR, 
MANDT TYPE STRING,
RSAREA TYPE STRING,
RSOBJTYPE TYPE STRING,
RSTYPE TYPE STRING,
REVERSALEXT TYPE STRING,
REVERSALINT TYPE STRING,
OPACTCN TYPE STRING,
OPACTCPD TYPE STRING,
ISRESPONSIBLEUSE TYPE STRING,
ISOCCUPANTUSER TYPE STRING,
INVOICE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REORC_RESERVATION_SETTINGS_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_REORC_RESERVATION_SETTINGS_STR-MANDT sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-RSAREA sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-RSOBJTYPE sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-RSTYPE sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-REVERSALEXT sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-REVERSALINT sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-OPACTCN sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-OPACTCPD sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-ISRESPONSIBLEUSE sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-ISOCCUPANTUSER sy-vline 
WA_REORC_RESERVATION_SETTINGS_STR-INVOICE sy-vline      INTO ld_text SEPARATED BY SPACE.

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