ABAP Select data from SAP table ICORRESPNCDUN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICORRESPNCDUN
*  INTO TABLE @DATA(IT_ICORRESPNCDUN2).
*--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_ICORRESPNCDUN INDEX 1 INTO DATA(WA_ICORRESPNCDUN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICORRESPNCDUN>-MANDT = 1.
<ICORRESPNCDUN>-CAMASSRUNDATE = 1.
<ICORRESPNCDUN>-CAMASSRUNID = 1.
<ICORRESPNCDUN>-CORRESPONDENCEKEY = 1.
<ICORRESPNCDUN>-CUSTOMEREVENTRECORDID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICORRESPNCDUN-BUSINESSPARTNER, sy-vline,
  WA_ICORRESPNCDUN-CAISSUEDATE, sy-vline,
  WA_ICORRESPNCDUN-CANETDUEDATE, sy-vline,
  WA_ICORRESPNCDUN-CONTRACTACCOUNT, sy-vline,
  WA_ICORRESPNCDUN-CACONTRACT, sy-vline,
  WA_ICORRESPNCDUN-CACORRESPONDENCETYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICORRESPNCDUN 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_ICORRESPNCDUN 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_ICORRESPNCDUN INTO WA_ICORRESPNCDUN.


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

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

*Conversion exit ALPHA, internal->external for field CACONTRACT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICORRESPNCDUN-CACONTRACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICORRESPNCDUN-CACONTRACT.
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_ICORRESPNCDUN_STR, 
MANDT TYPE STRING,
CAMASSRUNDATE TYPE STRING,
CAMASSRUNID TYPE STRING,
CORRESPONDENCEKEY TYPE STRING,
CUSTOMEREVENTRECORDID TYPE STRING,
BUSINESSPARTNER TYPE STRING,
CAISSUEDATE TYPE STRING,
CANETDUEDATE TYPE STRING,
CONTRACTACCOUNT TYPE STRING,
CACONTRACT TYPE STRING,
CACORRESPONDENCETYPE TYPE STRING,
CADUNNINGNOTICEISREVERSED TYPE STRING,
CADUNNINGLEVEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICORRESPNCDUN_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_ICORRESPNCDUN_STR-MANDT sy-vline 
WA_ICORRESPNCDUN_STR-CAMASSRUNDATE sy-vline 
WA_ICORRESPNCDUN_STR-CAMASSRUNID sy-vline 
WA_ICORRESPNCDUN_STR-CORRESPONDENCEKEY sy-vline 
WA_ICORRESPNCDUN_STR-CUSTOMEREVENTRECORDID sy-vline 
WA_ICORRESPNCDUN_STR-BUSINESSPARTNER sy-vline 
WA_ICORRESPNCDUN_STR-CAISSUEDATE sy-vline 
WA_ICORRESPNCDUN_STR-CANETDUEDATE sy-vline 
WA_ICORRESPNCDUN_STR-CONTRACTACCOUNT sy-vline 
WA_ICORRESPNCDUN_STR-CACONTRACT sy-vline 
WA_ICORRESPNCDUN_STR-CACORRESPONDENCETYPE sy-vline 
WA_ICORRESPNCDUN_STR-CADUNNINGNOTICEISREVERSED sy-vline 
WA_ICORRESPNCDUN_STR-CADUNNINGLEVEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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