ABAP Select data from SAP table IHC_TAB_ARCH_IDX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IHC_TAB_ARCH_IDX
*  INTO TABLE @DATA(IT_IHC_TAB_ARCH_IDX2).
*--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_IHC_TAB_ARCH_IDX INDEX 1 INTO DATA(WA_IHC_TAB_ARCH_IDX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IHC_TAB_ARCH_IDX>-CLIENT = 1.
<IHC_TAB_ARCH_IDX>-OBJECT_ID = 1.
<IHC_TAB_ARCH_IDX>-ARCHIVE_KEY = 1.
<IHC_TAB_ARCH_IDX>-ARCHIVE_OFFSET = 1.
<IHC_TAB_ARCH_IDX>-TIME_STAMP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IHC_TAB_ARCH_IDX-VARIANT_NAME, sy-vline,
  WA_IHC_TAB_ARCH_IDX-UNIT_FROM, sy-vline,
  WA_IHC_TAB_ARCH_IDX-UNIT_TO, sy-vline,
  WA_IHC_TAB_ARCH_IDX-PN_NUMBER_FROM, sy-vline,
  WA_IHC_TAB_ARCH_IDX-PN_NUMBER_TO, sy-vline,
  WA_IHC_TAB_ARCH_IDX-YEAR_FROM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IHC_TAB_ARCH_IDX 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_IHC_TAB_ARCH_IDX 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_IHC_TAB_ARCH_IDX INTO WA_IHC_TAB_ARCH_IDX.


*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 _UNIT, internal->external for field UNIT_FROM
CALL FUNCTION 'CONVERSION_EXIT__UNIT_OUTPUT'
  EXPORTING
    input =                      WA_IHC_TAB_ARCH_IDX-UNIT_FROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IHC_TAB_ARCH_IDX-UNIT_FROM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit _UNIT, internal->external for field UNIT_TO
CALL FUNCTION 'CONVERSION_EXIT__UNIT_OUTPUT'
  EXPORTING
    input =                      WA_IHC_TAB_ARCH_IDX-UNIT_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IHC_TAB_ARCH_IDX-UNIT_TO.
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_IHC_TAB_ARCH_IDX_STR, 
CLIENT TYPE STRING,
OBJECT_ID TYPE STRING,
ARCHIVE_KEY TYPE STRING,
ARCHIVE_OFFSET TYPE STRING,
TIME_STAMP TYPE STRING,
VARIANT_NAME TYPE STRING,
UNIT_FROM TYPE STRING,
UNIT_TO TYPE STRING,
PN_NUMBER_FROM TYPE STRING,
PN_NUMBER_TO TYPE STRING,
YEAR_FROM TYPE STRING,
YEAR_TO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IHC_TAB_ARCH_IDX_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_IHC_TAB_ARCH_IDX_STR-CLIENT sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-OBJECT_ID sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-ARCHIVE_KEY sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-ARCHIVE_OFFSET sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-TIME_STAMP sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-VARIANT_NAME sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-UNIT_FROM sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-UNIT_TO sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-PN_NUMBER_FROM sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-PN_NUMBER_TO sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-YEAR_FROM sy-vline 
WA_IHC_TAB_ARCH_IDX_STR-YEAR_TO sy-vline      INTO ld_text SEPARATED BY SPACE.

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