ABAP Select data from SAP table IRESERVATIONHD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IRESERVATIONHD
*  INTO TABLE @DATA(IT_IRESERVATIONHD2).
*--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_IRESERVATIONHD INDEX 1 INTO DATA(WA_IRESERVATIONHD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IRESERVATIONHD>-MANDT = 1.
<IRESERVATIONHD>-RESERVATION = 1.
<IRESERVATIONHD>-USERID = 1.
<IRESERVATIONHD>-ORDERID = 1.
<IRESERVATIONHD>-GOODSMOVEMENTTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IRESERVATIONHD-COSTCENTER, sy-vline,
  WA_IRESERVATIONHD-PROFITCENTER, sy-vline,
  WA_IRESERVATIONHD-CONTROLLINGAREA, sy-vline,
  WA_IRESERVATIONHD-PROFITABILITYSEGMENT, sy-vline,
  WA_IRESERVATIONHD-PROFITABILITYSEGMENT_2, sy-vline,
  WA_IRESERVATIONHD-GOODSRECIPIENTNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IRESERVATIONHD 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_IRESERVATIONHD 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_IRESERVATIONHD INTO WA_IRESERVATIONHD.


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

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

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

*Conversion exit ALPHA, internal->external for field PROFITABILITYSEGMENT_2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IRESERVATIONHD-PROFITABILITYSEGMENT_2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IRESERVATIONHD-PROFITABILITYSEGMENT_2.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ABPSP, internal->external for field WBSELEMENTINTERNALID
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_IRESERVATIONHD-WBSELEMENTINTERNALID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IRESERVATIONHD-WBSELEMENTINTERNALID.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field NETWORKNUMBERFORACCTASSGMT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IRESERVATIONHD-NETWORKNUMBERFORACCTASSGMT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IRESERVATIONHD-NETWORKNUMBERFORACCTASSGMT.
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_IRESERVATIONHD_STR, 
MANDT TYPE STRING,
RESERVATION TYPE STRING,
USERID TYPE STRING,
ORDERID TYPE STRING,
GOODSMOVEMENTTYPE TYPE STRING,
COSTCENTER TYPE STRING,
PROFITCENTER TYPE STRING,
CONTROLLINGAREA TYPE STRING,
PROFITABILITYSEGMENT TYPE STRING,
PROFITABILITYSEGMENT_2 TYPE STRING,
GOODSRECIPIENTNAME TYPE STRING,
RESERVATIONDATE TYPE STRING,
ISCHECKEDAGAINSTFACTORYCAL TYPE STRING,
CUSTOMER TYPE STRING,
WBSELEMENTINTERNALID TYPE STRING,
SALESORDER TYPE STRING,
SALESORDERITEM TYPE STRING,
SALESORDERSCHEDULELINE TYPE STRING,
ASSETNUMBER TYPE STRING,
ASSETSUBNUMBER TYPE STRING,
NETWORKNUMBERFORACCTASSGMT TYPE STRING,
ISSUINGORRECEIVINGPLANT TYPE STRING,
ISSUINGORRECEIVINGSTORAGELOC TYPE STRING,
RESVNVERIFICATIONCOMPANYCODE TYPE STRING,
CREATIONDATETIME TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IRESERVATIONHD_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_IRESERVATIONHD_STR-MANDT sy-vline 
WA_IRESERVATIONHD_STR-RESERVATION sy-vline 
WA_IRESERVATIONHD_STR-USERID sy-vline 
WA_IRESERVATIONHD_STR-ORDERID sy-vline 
WA_IRESERVATIONHD_STR-GOODSMOVEMENTTYPE sy-vline 
WA_IRESERVATIONHD_STR-COSTCENTER sy-vline 
WA_IRESERVATIONHD_STR-PROFITCENTER sy-vline 
WA_IRESERVATIONHD_STR-CONTROLLINGAREA sy-vline 
WA_IRESERVATIONHD_STR-PROFITABILITYSEGMENT sy-vline 
WA_IRESERVATIONHD_STR-PROFITABILITYSEGMENT_2 sy-vline 
WA_IRESERVATIONHD_STR-GOODSRECIPIENTNAME sy-vline 
WA_IRESERVATIONHD_STR-RESERVATIONDATE sy-vline 
WA_IRESERVATIONHD_STR-ISCHECKEDAGAINSTFACTORYCAL sy-vline 
WA_IRESERVATIONHD_STR-CUSTOMER sy-vline 
WA_IRESERVATIONHD_STR-WBSELEMENTINTERNALID sy-vline 
WA_IRESERVATIONHD_STR-SALESORDER sy-vline 
WA_IRESERVATIONHD_STR-SALESORDERITEM sy-vline 
WA_IRESERVATIONHD_STR-SALESORDERSCHEDULELINE sy-vline 
WA_IRESERVATIONHD_STR-ASSETNUMBER sy-vline 
WA_IRESERVATIONHD_STR-ASSETSUBNUMBER sy-vline 
WA_IRESERVATIONHD_STR-NETWORKNUMBERFORACCTASSGMT sy-vline 
WA_IRESERVATIONHD_STR-ISSUINGORRECEIVINGPLANT sy-vline 
WA_IRESERVATIONHD_STR-ISSUINGORRECEIVINGSTORAGELOC sy-vline 
WA_IRESERVATIONHD_STR-RESVNVERIFICATIONCOMPANYCODE sy-vline 
WA_IRESERVATIONHD_STR-CREATIONDATETIME sy-vline 
WA_IRESERVATIONHD_STR-LASTCHANGEDBYUSER sy-vline 
WA_IRESERVATIONHD_STR-LASTCHANGEDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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