ABAP Select data from SAP table IDCN_FORMHDR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IDCN_FORMHDR 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_FORMHDR. 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_FORMHDR 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_FORMHDR TYPE STANDARD TABLE OF IDCN_FORMHDR,
      WA_IDCN_FORMHDR TYPE IDCN_FORMHDR,
      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_FORMHDR> TYPE IDCN_FORMHDR.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDCN_FORMHDR
*  INTO TABLE @DATA(IT_IDCN_FORMHDR2).
*--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_FORMHDR INDEX 1 INTO DATA(WA_IDCN_FORMHDR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDCN_FORMHDR>-FSCDES = 1.
<IDCN_FORMHDR>-COMPANY = 1.
<IDCN_FORMHDR>-BYEAR = 1.
<IDCN_FORMHDR>-BMONTH = 1.
<IDCN_FORMHDR>-BDAY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDCN_FORMHDR-VYEAR, sy-vline,
  WA_IDCN_FORMHDR-VMONTH, sy-vline,
  WA_IDCN_FORMHDR-VDAY, sy-vline,
  WA_IDCN_FORMHDR-BJJV, sy-vline,
  WA_IDCN_FORMHDR-BMMV, sy-vline,
  WA_IDCN_FORMHDR-BJJB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IDCN_FORMHDR 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_FORMHDR 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_FORMHDR INTO WA_IDCN_FORMHDR.


*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 GJAHR, internal->external for field BYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IDCN_FORMHDR-BYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDCN_FORMHDR-BYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field VYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IDCN_FORMHDR-VYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDCN_FORMHDR-VYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field BJJV
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IDCN_FORMHDR-BJJV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDCN_FORMHDR-BJJV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field BJJB
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IDCN_FORMHDR-BJJB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDCN_FORMHDR-BJJB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field VJJV
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IDCN_FORMHDR-VJJV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDCN_FORMHDR-VJJV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field VJJB
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IDCN_FORMHDR-VJJB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDCN_FORMHDR-VJJB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IDCN_FORMHDR-PRCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDCN_FORMHDR-PRCTR.
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_FORMHDR_STR, 
FSCDES TYPE STRING,
COMPANY TYPE STRING,
BYEAR TYPE STRING,
BMONTH TYPE STRING,
BDAY TYPE STRING,
VYEAR TYPE STRING,
VMONTH TYPE STRING,
VDAY TYPE STRING,
BJJV TYPE STRING,
BMMV TYPE STRING,
BJJB TYPE STRING,
BMMB TYPE STRING,
VJJV TYPE STRING,
VMMV TYPE STRING,
VJJB TYPE STRING,
VMMB TYPE STRING,
BPERIOD_D TYPE STRING,
VPERIOD_D TYPE STRING,
CURRENCY TYPE STRING,
BILASKAL TYPE STRING,
BILASKALTXT TYPE STRING,
BILATYPE TYPE STRING,
TITLE TYPE STRING,
BTXTCOL TYPE STRING,
VTXTCOL TYPE STRING,
PDF TYPE STRING,
GSBER TYPE STRING,
PRCTR TYPE STRING,
CDATE TYPE STRING,
CTIME TYPE STRING,
CUSER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDCN_FORMHDR_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_FORMHDR_STR-FSCDES sy-vline 
WA_IDCN_FORMHDR_STR-COMPANY sy-vline 
WA_IDCN_FORMHDR_STR-BYEAR sy-vline 
WA_IDCN_FORMHDR_STR-BMONTH sy-vline 
WA_IDCN_FORMHDR_STR-BDAY sy-vline 
WA_IDCN_FORMHDR_STR-VYEAR sy-vline 
WA_IDCN_FORMHDR_STR-VMONTH sy-vline 
WA_IDCN_FORMHDR_STR-VDAY sy-vline 
WA_IDCN_FORMHDR_STR-BJJV sy-vline 
WA_IDCN_FORMHDR_STR-BMMV sy-vline 
WA_IDCN_FORMHDR_STR-BJJB sy-vline 
WA_IDCN_FORMHDR_STR-BMMB sy-vline 
WA_IDCN_FORMHDR_STR-VJJV sy-vline 
WA_IDCN_FORMHDR_STR-VMMV sy-vline 
WA_IDCN_FORMHDR_STR-VJJB sy-vline 
WA_IDCN_FORMHDR_STR-VMMB sy-vline 
WA_IDCN_FORMHDR_STR-BPERIOD_D sy-vline 
WA_IDCN_FORMHDR_STR-VPERIOD_D sy-vline 
WA_IDCN_FORMHDR_STR-CURRENCY sy-vline 
WA_IDCN_FORMHDR_STR-BILASKAL sy-vline 
WA_IDCN_FORMHDR_STR-BILASKALTXT sy-vline 
WA_IDCN_FORMHDR_STR-BILATYPE sy-vline 
WA_IDCN_FORMHDR_STR-TITLE sy-vline 
WA_IDCN_FORMHDR_STR-BTXTCOL sy-vline 
WA_IDCN_FORMHDR_STR-VTXTCOL sy-vline 
WA_IDCN_FORMHDR_STR-PDF sy-vline 
WA_IDCN_FORMHDR_STR-GSBER sy-vline 
WA_IDCN_FORMHDR_STR-PRCTR sy-vline 
WA_IDCN_FORMHDR_STR-CDATE sy-vline 
WA_IDCN_FORMHDR_STR-CTIME sy-vline 
WA_IDCN_FORMHDR_STR-CUSER sy-vline      INTO ld_text SEPARATED BY SPACE.

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