ABAP Select data from SAP table ICLRESERVE_HISTORY_ALV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICLRESERVE_HISTORY_ALV
*  INTO TABLE @DATA(IT_ICLRESERVE_HISTORY_ALV2).
*--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_ICLRESERVE_HISTORY_ALV INDEX 1 INTO DATA(WA_ICLRESERVE_HISTORY_ALV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICLRESERVE_HISTORY_ALV>-SUBCL = 1.
<ICLRESERVE_HISTORY_ALV>-RESTYPE = 1.
<ICLRESERVE_HISTORY_ALV>-SUBCLTYPE = 1.
<ICLRESERVE_HISTORY_ALV>-SUBCLTYPE_NAME = 1.
<ICLRESERVE_HISTORY_ALV>-SUBCLTYPEDESC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICLRESERVE_HISTORY_ALV-RESTYPE_NAME, sy-vline,
  WA_ICLRESERVE_HISTORY_ALV-NETRES, sy-vline,
  WA_ICLRESERVE_HISTORY_ALV-PAMPAID, sy-vline,
  WA_ICLRESERVE_HISTORY_ALV-GROSSRES, sy-vline,
  WA_ICLRESERVE_HISTORY_ALV-CURR, sy-vline,
  WA_ICLRESERVE_HISTORY_ALV-POSTDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICLRESERVE_HISTORY_ALV 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_ICLRESERVE_HISTORY_ALV 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_ICLRESERVE_HISTORY_ALV INTO WA_ICLRESERVE_HISTORY_ALV.


*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 CUNIT, internal->external for field RSQUANUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ICLRESERVE_HISTORY_ALV-RSQUANUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICLRESERVE_HISTORY_ALV-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_ICLRESERVE_HISTORY_ALV_STR, 
SUBCL TYPE STRING,
RESTYPE TYPE STRING,
SUBCLTYPE TYPE STRING,
SUBCLTYPE_NAME TYPE STRING,
SUBCLTYPEDESC TYPE STRING,
RESTYPE_NAME TYPE STRING,
NETRES TYPE STRING,
PAMPAID TYPE STRING,
GROSSRES TYPE STRING,
CURR TYPE STRING,
POSTDATE TYPE STRING,
CHANGEDATET TYPE STRING,
CHANGETIMET TYPE STRING,
CHANGEREASON TYPE STRING,
CHANGEREASON_NAME TYPE STRING,
CHANGEDBY TYPE STRING,
METHOD TYPE STRING,
METHOD_NAME TYPE STRING,
RSAMTPERUNIT TYPE STRING,
RSQUANTITY TYPE STRING,
RSQUANUNIT TYPE STRING,
RSQUANUNITN TYPE STRING,
SUBRO_RECEIVED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICLRESERVE_HISTORY_ALV_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_ICLRESERVE_HISTORY_ALV_STR-SUBCL sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-RESTYPE sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-SUBCLTYPE sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-SUBCLTYPE_NAME sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-SUBCLTYPEDESC sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-RESTYPE_NAME sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-NETRES sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-PAMPAID sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-GROSSRES sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-CURR sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-POSTDATE sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-CHANGEDATET sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-CHANGETIMET sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-CHANGEREASON sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-CHANGEREASON_NAME sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-CHANGEDBY sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-METHOD sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-METHOD_NAME sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-RSAMTPERUNIT sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-RSQUANTITY sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-RSQUANUNIT sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-RSQUANUNITN sy-vline 
WA_ICLRESERVE_HISTORY_ALV_STR-SUBRO_RECEIVED sy-vline      INTO ld_text SEPARATED BY SPACE.

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