ABAP Select data from SAP table REOR_API_RESERVATION_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REOR_API_RESERVATION_ITEM
*  INTO TABLE @DATA(IT_REOR_API_RESERVATION_ITEM2).
*--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_REOR_API_RESERVATION_ITEM INDEX 1 INTO DATA(WA_REOR_API_RESERVATION_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REOR_API_RESERVATION_ITEM>-ID = 1.
<REOR_API_RESERVATION_ITEM>-RSGUID = 1.
<REOR_API_RESERVATION_ITEM>-RSIDEXT = 1.
<REOR_API_RESERVATION_ITEM>-OBJNROO = 1.
<REOR_API_RESERVATION_ITEM>-OCCUPANT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REOR_API_RESERVATION_ITEM-OCCUPANTROLE, sy-vline,
  WA_REOR_API_RESERVATION_ITEM-VALIDFROM, sy-vline,
  WA_REOR_API_RESERVATION_ITEM-VALIDTO, sy-vline,
  WA_REOR_API_RESERVATION_ITEM-RSOBJTYPE, sy-vline,
  WA_REOR_API_RESERVATION_ITEM-RSTYPE, sy-vline,
  WA_REOR_API_RESERVATION_ITEM-RSRECGUID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REOR_API_RESERVATION_ITEM 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_REOR_API_RESERVATION_ITEM 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_REOR_API_RESERVATION_ITEM INTO WA_REOR_API_RESERVATION_ITEM.


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

*Conversion exit ALPHA, internal->external for field OCCUPANT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REOR_API_RESERVATION_ITEM-OCCUPANT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REOR_API_RESERVATION_ITEM-OCCUPANT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit RETZS, internal->external for field VALIDFROM
CALL FUNCTION 'CONVERSION_EXIT_RETZS_OUTPUT'
  EXPORTING
    input =                      WA_REOR_API_RESERVATION_ITEM-VALIDFROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REOR_API_RESERVATION_ITEM-VALIDFROM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit RETZS, internal->external for field VALIDTO
CALL FUNCTION 'CONVERSION_EXIT_RETZS_OUTPUT'
  EXPORTING
    input =                      WA_REOR_API_RESERVATION_ITEM-VALIDTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REOR_API_RESERVATION_ITEM-VALIDTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit RETZS, internal->external for field RECVALIDFROM
CALL FUNCTION 'CONVERSION_EXIT_RETZS_OUTPUT'
  EXPORTING
    input =                      WA_REOR_API_RESERVATION_ITEM-RECVALIDFROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REOR_API_RESERVATION_ITEM-RECVALIDFROM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit RETZS, internal->external for field RECVALIDTO
CALL FUNCTION 'CONVERSION_EXIT_RETZS_OUTPUT'
  EXPORTING
    input =                      WA_REOR_API_RESERVATION_ITEM-RECVALIDTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REOR_API_RESERVATION_ITEM-RECVALIDTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EXTINVREC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REOR_API_RESERVATION_ITEM-EXTINVREC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REOR_API_RESERVATION_ITEM-EXTINVREC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSRESPONSIBLE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REOR_API_RESERVATION_ITEM-RSRESPONSIBLE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REOR_API_RESERVATION_ITEM-RSRESPONSIBLE.
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_REOR_API_RESERVATION_ITEM_STR, 
ID TYPE STRING,
RSGUID TYPE STRING,
RSIDEXT TYPE STRING,
OBJNROO TYPE STRING,
OCCUPANT TYPE STRING,
OCCUPANTROLE TYPE STRING,
VALIDFROM TYPE STRING,
VALIDTO TYPE STRING,
RSOBJTYPE TYPE STRING,
RSTYPE TYPE STRING,
RSRECGUID TYPE STRING,
RECVALIDFROM TYPE STRING,
RECVALIDTO TYPE STRING,
STATEIND TYPE STRING,
ISREVERSED TYPE STRING,
ISOCCEXT TYPE STRING,
SETTLETYPE TYPE STRING,
OBJNRCN TYPE STRING,
XRS TYPE STRING,
EXTINVREC TYPE STRING,
RSRESPONSIBLE TYPE STRING,
RSRESPROLE TYPE STRING,
NUMPARTICIPANTS TYPE STRING,
PARTICIPLISTGUID TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
TZONE TYPE STRING,
FDELETE TYPE STRING,
ACTIONCODE TYPE STRING,
RESPONSIBLEUSER TYPE STRING,
OCCUPANTUSER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REOR_API_RESERVATION_ITEM_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_REOR_API_RESERVATION_ITEM_STR-ID sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RSGUID sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RSIDEXT sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-OBJNROO sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-OCCUPANT sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-OCCUPANTROLE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-VALIDFROM sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-VALIDTO sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RSOBJTYPE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RSTYPE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RSRECGUID sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RECVALIDFROM sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RECVALIDTO sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-STATEIND sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-ISREVERSED sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-ISOCCEXT sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-SETTLETYPE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-OBJNRCN sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-XRS sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-EXTINVREC sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RSRESPONSIBLE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RSRESPROLE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-NUMPARTICIPANTS sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-PARTICIPLISTGUID sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RERF sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-DERF sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-TERF sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-REHER sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RBEAR sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-DBEAR sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-TBEAR sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RBHER sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-TZONE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-FDELETE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-ACTIONCODE sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-RESPONSIBLEUSER sy-vline 
WA_REOR_API_RESERVATION_ITEM_STR-OCCUPANTUSER sy-vline      INTO ld_text SEPARATED BY SPACE.

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