ABAP Select data from SAP table HRNO_AL2ICORRESPONDENCE_EXTER4 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP HRNO_AL2ICORRESPONDENCE_EXTER4 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 HRNO_AL2ICORRESPONDENCE_EXTER4. 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 HRNO_AL2ICORRESPONDENCE_EXTER4 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_HRNO_AL2ICORRESPONDENCE_EXTER4 TYPE STANDARD TABLE OF HRNO_AL2ICORRESPONDENCE_EXTER4,
      WA_HRNO_AL2ICORRESPONDENCE_EXTER4 TYPE HRNO_AL2ICORRESPONDENCE_EXTER4,
      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: <HRNO_AL2ICORRESPONDENCE_EXTER4> TYPE HRNO_AL2ICORRESPONDENCE_EXTER4.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_HRNO_AL2ICORRESPONDENCE_EXTER4.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM HRNO_AL2ICORRESPONDENCE_EXTER4
  INTO TABLE IT_HRNO_AL2ICORRESPONDENCE_EXTER4.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HRNO_AL2ICORRESPONDENCE_EXTER4
*  INTO TABLE @DATA(IT_HRNO_AL2ICORRESPONDENCE_EXTER42).
*--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_HRNO_AL2ICORRESPONDENCE_EXTER4 INDEX 1 INTO DATA(WA_HRNO_AL2ICORRESPONDENCE_EXTER42).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_HRNO_AL2ICORRESPONDENCE_EXTER4 ASSIGNING <HRNO_AL2ICORRESPONDENCE_EXTER4>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HRNO_AL2ICORRESPONDENCE_EXTER4>-CONTROLLER = 1.
<HRNO_AL2ICORRESPONDENCE_EXTER4>-GET_CORRESPONDENCE_FOR_END_USE = 1.
<HRNO_AL2ICORRESPONDENCE_EXTER4>-CONTROLLER = 1.
<HRNO_AL2ICORRESPONDENCE_EXTER4>-CORRESPONDENCE = 1.
<HRNO_AL2ICORRESPONDENCE_EXTER4>-CONTROLLER = 1.

ENDLOOP.

LOOP AT IT_HRNO_AL2ICORRESPONDENCE_EXTER4 INTO WA_HRNO_AL2ICORRESPONDENCE_EXTER4.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HRNO_AL2ICORRESPONDENCE_EXTER4-ARCHIVE_REFERENCE, sy-vline,
  WA_HRNO_AL2ICORRESPONDENCE_EXTER4-AUTHENTICATED_USER, sy-vline,
  WA_HRNO_AL2ICORRESPONDENCE_EXTER4-CONFIRMATION_DATE, sy-vline,
  WA_HRNO_AL2ICORRESPONDENCE_EXTER4-CORRESPONDENCE_ID, sy-vline,
  WA_HRNO_AL2ICORRESPONDENCE_EXTER4-CORRESPONDENCE_NAME, sy-vline,
  WA_HRNO_AL2ICORRESPONDENCE_EXTER4-CORRESPONDENCE_STATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HRNO_AL2ICORRESPONDENCE_EXTER4 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_HRNO_AL2ICORRESPONDENCE_EXTER4 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_HRNO_AL2ICORRESPONDENCE_EXTER4 INTO WA_HRNO_AL2ICORRESPONDENCE_EXTER4.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_HRNO_AL2ICORRESPONDENCE_EXTER4_STR, 
CONTROLLER TYPE STRING,
GET_CORRESPONDENCE_FOR_END_USE TYPE STRING,
CONTROLLER TYPE STRING,
CORRESPONDENCE TYPE STRING,
CONTROLLER TYPE STRING,
ARCHIVE_REFERENCE TYPE STRING,
AUTHENTICATED_USER TYPE STRING,
CONFIRMATION_DATE TYPE STRING,
CORRESPONDENCE_ID TYPE STRING,
CORRESPONDENCE_NAME TYPE STRING,
CORRESPONDENCE_STATUS TYPE STRING,
CORRESPONDENCE_SUBJECT TYPE STRING,
CORRESPONDENCE_SUMMARY TYPE STRING,
CORRESPONDENCE_TITLE TYPE STRING,
CORRESPONDENCE_TXT TYPE STRING,
CUSTOM_MESSAGE_DATA TYPE STRING,
DATE_SENT TYPE STRING,
DESCRIPTION TYPE STRING,
DUE_DATE TYPE STRING,
EXTERNAL_SYSTEM_REFERENCE TYPE STRING,
HEADER TYPE STRING,
IS_CONFIRMATION_NEEDED TYPE STRING,
LANGUAGE_ID TYPE STRING,
REPORTEE TYPE STRING,
SENT_BY TYPE STRING,
SENT_TO TYPE STRING,
USER_ID TYPE STRING,
CORRESPONDENCE_ATTACHMENTS TYPE STRING,
CONTROLLER TYPE STRING,
ATTACHMENT_BE TYPE STRING,
CORRESPONDENCE_LINKS TYPE STRING,
CONTROLLER TYPE STRING,
CORRESPONDENCE_LINK TYPE STRING,
CORRESPONDENCE_NOTIFICATIONS TYPE STRING,
CONTROLLER TYPE STRING,
INTERNAL_NOTIFICATION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HRNO_AL2ICORRESPONDENCE_EXTER4_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_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CONTROLLER sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-GET_CORRESPONDENCE_FOR_END_USE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CONTROLLER sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CONTROLLER sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-ARCHIVE_REFERENCE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-AUTHENTICATED_USER sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CONFIRMATION_DATE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_ID sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_NAME sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_STATUS sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_SUBJECT sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_SUMMARY sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_TITLE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_TXT sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CUSTOM_MESSAGE_DATA sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-DATE_SENT sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-DESCRIPTION sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-DUE_DATE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-EXTERNAL_SYSTEM_REFERENCE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-HEADER sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-IS_CONFIRMATION_NEEDED sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-LANGUAGE_ID sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-REPORTEE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-SENT_BY sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-SENT_TO sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-USER_ID sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_ATTACHMENTS sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CONTROLLER sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-ATTACHMENT_BE sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_LINKS sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CONTROLLER sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_LINK sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CORRESPONDENCE_NOTIFICATIONS sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-CONTROLLER sy-vline 
WA_HRNO_AL2ICORRESPONDENCE_EXTER4_STR-INTERNAL_NOTIFICATION sy-vline      INTO ld_text SEPARATED BY SPACE.

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