ABAP Select data from SAP table RECN_EXTERNAL_HEADER_ODATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RECN_EXTERNAL_HEADER_ODATA
*  INTO TABLE @DATA(IT_RECN_EXTERNAL_HEADER_ODATA2).
*--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_RECN_EXTERNAL_HEADER_ODATA INDEX 1 INTO DATA(WA_RECN_EXTERNAL_HEADER_ODATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RECN_EXTERNAL_HEADER_ODATA>-BUKRS = 1.
<RECN_EXTERNAL_HEADER_ODATA>-RECNNR = 1.
<RECN_EXTERNAL_HEADER_ODATA>-RECNTYPE = 1.
<RECN_EXTERNAL_HEADER_ODATA>-RECNTXT = 1.
<RECN_EXTERNAL_HEADER_ODATA>-RECNBEG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RECN_EXTERNAL_HEADER_ODATA-RECNEND1ST, sy-vline,
  WA_RECN_EXTERNAL_HEADER_ODATA-RECNENDABS, sy-vline,
  WA_RECN_EXTERNAL_HEADER_ODATA-XRECNTYPE, sy-vline,
  WA_RECN_EXTERNAL_HEADER_ODATA-XBUKRS, sy-vline,
  WA_RECN_EXTERNAL_HEADER_ODATA-CITY, sy-vline,
  WA_RECN_EXTERNAL_HEADER_ODATA-STREET, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RECN_EXTERNAL_HEADER_ODATA 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_RECN_EXTERNAL_HEADER_ODATA 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_RECN_EXTERNAL_HEADER_ODATA INTO WA_RECN_EXTERNAL_HEADER_ODATA.


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

*Conversion exit REDAT, internal->external for field RECNENDABS
CALL FUNCTION 'CONVERSION_EXIT_REDAT_OUTPUT'
  EXPORTING
    input =                      WA_RECN_EXTERNAL_HEADER_ODATA-RECNENDABS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RECN_EXTERNAL_HEADER_ODATA-RECNENDABS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNTXTOLD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RECN_EXTERNAL_HEADER_ODATA-RECNTXTOLD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RECN_EXTERNAL_HEADER_ODATA-RECNTXTOLD.
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_RECN_EXTERNAL_HEADER_ODATA_STR, 
BUKRS TYPE STRING,
RECNNR TYPE STRING,
RECNTYPE TYPE STRING,
RECNTXT TYPE STRING,
RECNBEG TYPE STRING,
RECNEND1ST TYPE STRING,
RECNENDABS TYPE STRING,
XRECNTYPE TYPE STRING,
XBUKRS TYPE STRING,
CITY TYPE STRING,
STREET TYPE STRING,
COUNTRY TYPE STRING,
POSTL_COD1 TYPE STRING,
HOUSE_NO TYPE STRING,
URL TYPE STRING,
RECNDAT TYPE STRING,
RECN2DAT TYPE STRING,
RECNTXTOLD TYPE STRING,
RECNTLAW TYPE STRING,
DUMMYFIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RECN_EXTERNAL_HEADER_ODATA_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_RECN_EXTERNAL_HEADER_ODATA_STR-BUKRS sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNNR sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNTYPE sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNTXT sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNBEG sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNEND1ST sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNENDABS sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-XRECNTYPE sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-XBUKRS sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-CITY sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-STREET sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-COUNTRY sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-POSTL_COD1 sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-HOUSE_NO sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-URL sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNDAT sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECN2DAT sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNTXTOLD sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-RECNTLAW sy-vline 
WA_RECN_EXTERNAL_HEADER_ODATA_STR-DUMMYFIELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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