ABAP Select data from SAP table IDCN_EXCP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDCN_EXCP
*  INTO TABLE @DATA(IT_IDCN_EXCP2).
*--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_IDCN_EXCP INDEX 1 INTO DATA(WA_IDCN_EXCP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDCN_EXCP>-MANDT = 1.
<IDCN_EXCP>-BUKRS = 1.
<IDCN_EXCP>-LOTNO = 1.
<IDCN_EXCP>-BOKNO = 1.
<IDCN_EXCP>-INVNO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDCN_EXCP-XBLNR, sy-vline,
  WA_IDCN_EXCP-BLLNR, sy-vline,
  WA_IDCN_EXCP-ACCNR, sy-vline,
  WA_IDCN_EXCP-FYEAR, sy-vline,
  WA_IDCN_EXCP-ISSDT, sy-vline,
  WA_IDCN_EXCP-VIDRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IDCN_EXCP 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_IDCN_EXCP 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_IDCN_EXCP INTO WA_IDCN_EXCP.


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

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

*Conversion exit GJAHR, internal->external for field FYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IDCN_EXCP-FYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDCN_EXCP-FYEAR.
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_IDCN_EXCP_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
LOTNO TYPE STRING,
BOKNO TYPE STRING,
INVNO TYPE STRING,
XBLNR TYPE STRING,
BLLNR TYPE STRING,
ACCNR TYPE STRING,
FYEAR TYPE STRING,
ISSDT TYPE STRING,
VIDRS TYPE STRING,
CRTBY TYPE STRING,
CRTON TYPE STRING,
EXCIF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDCN_EXCP_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_IDCN_EXCP_STR-MANDT sy-vline 
WA_IDCN_EXCP_STR-BUKRS sy-vline 
WA_IDCN_EXCP_STR-LOTNO sy-vline 
WA_IDCN_EXCP_STR-BOKNO sy-vline 
WA_IDCN_EXCP_STR-INVNO sy-vline 
WA_IDCN_EXCP_STR-XBLNR sy-vline 
WA_IDCN_EXCP_STR-BLLNR sy-vline 
WA_IDCN_EXCP_STR-ACCNR sy-vline 
WA_IDCN_EXCP_STR-FYEAR sy-vline 
WA_IDCN_EXCP_STR-ISSDT sy-vline 
WA_IDCN_EXCP_STR-VIDRS sy-vline 
WA_IDCN_EXCP_STR-CRTBY sy-vline 
WA_IDCN_EXCP_STR-CRTON sy-vline 
WA_IDCN_EXCP_STR-EXCIF sy-vline      INTO ld_text SEPARATED BY SPACE.

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