ABAP Select data from SAP table ICAINBCORRESPNC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICAINBCORRESPNC
*  INTO TABLE @DATA(IT_ICAINBCORRESPNC2).
*--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_ICAINBCORRESPNC INDEX 1 INTO DATA(WA_ICAINBCORRESPNC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICAINBCORRESPNC>-MANDT = 1.
<ICAINBCORRESPNC>-CACORRESPONDENCE = 1.
<ICAINBCORRESPNC>-CASTARTDATEOFBILLINGPERIOD = 1.
<ICAINBCORRESPNC>-CAENDDATEOFBILLINGPERIOD = 1.
<ICAINBCORRESPNC>-CAPERIODCODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICAINBCORRESPNC-CADEFERRALDATE, sy-vline,
  WA_ICAINBCORRESPNC-CAINBOUNDCORRESPNCCATEGORY, sy-vline,
  WA_ICAINBCORRESPNC-ALTERNATIVEPERIODISEXISTING, sy-vline,
  WA_ICAINBCORRESPNC-CAINBCORRESPNCCLEARINGRSN, sy-vline,
  WA_ICAINBCORRESPNC-CAINBCORRESPNCLEADINGOBJECT, sy-vline,
  WA_ICAINBCORRESPNC-CAINBCORRESPNCCNSLDTNSTATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICAINBCORRESPNC 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_ICAINBCORRESPNC 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_ICAINBCORRESPNC INTO WA_ICAINBCORRESPNC.


*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 CAINBCORRESPNCLEADINGOBJECT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICAINBCORRESPNC-CAINBCORRESPNCLEADINGOBJECT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICAINBCORRESPNC-CAINBCORRESPNCLEADINGOBJECT.
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_ICAINBCORRESPNC_STR, 
MANDT TYPE STRING,
CACORRESPONDENCE TYPE STRING,
CASTARTDATEOFBILLINGPERIOD TYPE STRING,
CAENDDATEOFBILLINGPERIOD TYPE STRING,
CAPERIODCODE TYPE STRING,
CADEFERRALDATE TYPE STRING,
CAINBOUNDCORRESPNCCATEGORY TYPE STRING,
ALTERNATIVEPERIODISEXISTING TYPE STRING,
CAINBCORRESPNCCLEARINGRSN TYPE STRING,
CAINBCORRESPNCLEADINGOBJECT TYPE STRING,
CAINBCORRESPNCCNSLDTNSTATUS TYPE STRING,
REMINDERISSENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICAINBCORRESPNC_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_ICAINBCORRESPNC_STR-MANDT sy-vline 
WA_ICAINBCORRESPNC_STR-CACORRESPONDENCE sy-vline 
WA_ICAINBCORRESPNC_STR-CASTARTDATEOFBILLINGPERIOD sy-vline 
WA_ICAINBCORRESPNC_STR-CAENDDATEOFBILLINGPERIOD sy-vline 
WA_ICAINBCORRESPNC_STR-CAPERIODCODE sy-vline 
WA_ICAINBCORRESPNC_STR-CADEFERRALDATE sy-vline 
WA_ICAINBCORRESPNC_STR-CAINBOUNDCORRESPNCCATEGORY sy-vline 
WA_ICAINBCORRESPNC_STR-ALTERNATIVEPERIODISEXISTING sy-vline 
WA_ICAINBCORRESPNC_STR-CAINBCORRESPNCCLEARINGRSN sy-vline 
WA_ICAINBCORRESPNC_STR-CAINBCORRESPNCLEADINGOBJECT sy-vline 
WA_ICAINBCORRESPNC_STR-CAINBCORRESPNCCNSLDTNSTATUS sy-vline 
WA_ICAINBCORRESPNC_STR-REMINDERISSENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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