ABAP Select data from SAP table ICSRESERVE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICSRESERVE
*  INTO TABLE @DATA(IT_ICSRESERVE2).
*--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_ICSRESERVE INDEX 1 INTO DATA(WA_ICSRESERVE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICSRESERVE>-CLIENT = 1.
<ICSRESERVE>-ACTIVE = 1.
<ICSRESERVE>-CLAIM = 1.
<ICSRESERVE>-SUBCL = 1.
<ICSRESERVE>-RESTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICSRESERVE-CURR, sy-vline,
  WA_ICSRESERVE-CHANGETIME, sy-vline,
  WA_ICSRESERVE-CHANGEDBY, sy-vline,
  WA_ICSRESERVE-DELETED, sy-vline,
  WA_ICSRESERVE-GROSSRES, sy-vline,
  WA_ICSRESERVE-METHOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICSRESERVE 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_ICSRESERVE 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_ICSRESERVE INTO WA_ICSRESERVE.


*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_ICSRESERVE-CLAIM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICSRESERVE-CLAIM.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit CUNIT, internal->external for field RSQUANUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ICSRESERVE-RSQUANUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICSRESERVE-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_ICSRESERVE_STR, 
CLIENT TYPE STRING,
ACTIVE TYPE STRING,
CLAIM TYPE STRING,
SUBCL TYPE STRING,
RESTYPE TYPE STRING,
CURR 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_ICSRESERVE_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_ICSRESERVE_STR-CLIENT sy-vline 
WA_ICSRESERVE_STR-ACTIVE sy-vline 
WA_ICSRESERVE_STR-CLAIM sy-vline 
WA_ICSRESERVE_STR-SUBCL sy-vline 
WA_ICSRESERVE_STR-RESTYPE sy-vline 
WA_ICSRESERVE_STR-CURR sy-vline 
WA_ICSRESERVE_STR-CHANGETIME sy-vline 
WA_ICSRESERVE_STR-CHANGEDBY sy-vline 
WA_ICSRESERVE_STR-DELETED sy-vline 
WA_ICSRESERVE_STR-GROSSRES sy-vline 
WA_ICSRESERVE_STR-METHOD sy-vline 
WA_ICSRESERVE_STR-XAPPROVED sy-vline 
WA_ICSRESERVE_STR-APPROVEDBY sy-vline 
WA_ICSRESERVE_STR-APPROVEDTIME sy-vline 
WA_ICSRESERVE_STR-CHANGEREASON sy-vline 
WA_ICSRESERVE_STR-POSTDATE sy-vline 
WA_ICSRESERVE_STR-RSAMTPERUNIT sy-vline 
WA_ICSRESERVE_STR-RSQUANTITY sy-vline 
WA_ICSRESERVE_STR-RSQUANUNIT sy-vline 
WA_ICSRESERVE_STR-RSPENDING sy-vline 
WA_ICSRESERVE_STR-RSREASON_REJ sy-vline 
WA_ICSRESERVE_STR-ASSIGN_GUID sy-vline 
WA_ICSRESERVE_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.