ABAP Select data from SAP table ICL_RESERVECOLL_RESERVE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICL_RESERVECOLL_RESERVE
*  INTO TABLE @DATA(IT_ICL_RESERVECOLL_RESERVE2).
*--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_ICL_RESERVECOLL_RESERVE INDEX 1 INTO DATA(WA_ICL_RESERVECOLL_RESERVE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICL_RESERVECOLL_RESERVE>-COMPANYCODE = 1.
<ICL_RESERVECOLL_RESERVE>-CURR = 1.
<ICL_RESERVECOLL_RESERVE>-RESTYPE = 1.
<ICL_RESERVECOLL_RESERVE>-NETRES = 1.
<ICL_RESERVECOLL_RESERVE>-ACTIVE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICL_RESERVECOLL_RESERVE-CLAIM, sy-vline,
  WA_ICL_RESERVECOLL_RESERVE-SUBCL, sy-vline,
  WA_ICL_RESERVECOLL_RESERVE-CHANGETIME, sy-vline,
  WA_ICL_RESERVECOLL_RESERVE-CHANGEDBY, sy-vline,
  WA_ICL_RESERVECOLL_RESERVE-DELETED, sy-vline,
  WA_ICL_RESERVECOLL_RESERVE-GROSSRES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICL_RESERVECOLL_RESERVE 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_ICL_RESERVECOLL_RESERVE 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_ICL_RESERVECOLL_RESERVE INTO WA_ICL_RESERVECOLL_RESERVE.


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

*Conversion exit TSTAM, internal->external for field CHANGETIME
CALL FUNCTION 'CONVERSION_EXIT_TSTAM_OUTPUT'
  EXPORTING
    input =                      WA_ICL_RESERVECOLL_RESERVE-CHANGETIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICL_RESERVECOLL_RESERVE-CHANGETIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTAM, internal->external for field APPROVEDTIME
CALL FUNCTION 'CONVERSION_EXIT_TSTAM_OUTPUT'
  EXPORTING
    input =                      WA_ICL_RESERVECOLL_RESERVE-APPROVEDTIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICL_RESERVECOLL_RESERVE-APPROVEDTIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field RSQUANUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ICL_RESERVECOLL_RESERVE-RSQUANUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICL_RESERVECOLL_RESERVE-RSQUANUNIT.
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_ICL_RESERVECOLL_RESERVE_STR, 
COMPANYCODE TYPE STRING,
CURR TYPE STRING,
RESTYPE TYPE STRING,
NETRES TYPE STRING,
ACTIVE TYPE STRING,
CLAIM TYPE STRING,
SUBCL TYPE STRING,
CHANGETIME TYPE STRING,
CHANGEDBY TYPE STRING,
DELETED TYPE STRING,
GROSSRES TYPE STRING,
METHOD TYPE STRING,
XAPPROVED TYPE STRING,
APPROVEDBY TYPE STRING,
APPROVEDTIME TYPE STRING,
CHANGEREASON TYPE STRING,
POSTDATE TYPE STRING,
RSAMTPERUNIT TYPE STRING,
RSQUANTITY TYPE STRING,
RSQUANUNIT TYPE STRING,
RSPENDING TYPE STRING,
RSREASON_REJ TYPE STRING,
ASSIGN_GUID TYPE STRING,
RESTYPE_MI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICL_RESERVECOLL_RESERVE_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_ICL_RESERVECOLL_RESERVE_STR-COMPANYCODE sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-CURR sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-RESTYPE sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-NETRES sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-ACTIVE sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-CLAIM sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-SUBCL sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-CHANGETIME sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-CHANGEDBY sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-DELETED sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-GROSSRES sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-METHOD sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-XAPPROVED sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-APPROVEDBY sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-APPROVEDTIME sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-CHANGEREASON sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-POSTDATE sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-RSAMTPERUNIT sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-RSQUANTITY sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-RSQUANUNIT sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-RSPENDING sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-RSREASON_REJ sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-ASSIGN_GUID sy-vline 
WA_ICL_RESERVECOLL_RESERVE_STR-RESTYPE_MI sy-vline      INTO ld_text SEPARATED BY SPACE.

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