ABAP Select data from SAP table IEXCHANGEHEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IEXCHANGEHEADER
*  INTO TABLE @DATA(IT_IEXCHANGEHEADER2).
*--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_IEXCHANGEHEADER INDEX 1 INTO DATA(WA_IEXCHANGEHEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IEXCHANGEHEADER>-MANDT = 1.
<IEXCHANGEHEADER>-EXCHANGEAGREEMENT = 1.
<IEXCHANGEHEADER>-EXCHANGEAGREEMENTPARTNER = 1.
<IEXCHANGEHEADER>-EXCHANGEAGREEMENTTYPE = 1.
<IEXCHANGEHEADER>-EXCHAGREEMENTPARTNERREFCODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IEXCHANGEHEADER-EXCHANGEAGREEMENTSTATUS, sy-vline,
  WA_IEXCHANGEHEADER-EXCHANGEAGREEMENTEVERGREENTYPE, sy-vline,
  WA_IEXCHANGEHEADER-EXCHANGEAGREEMENTSTARTDATE, sy-vline,
  WA_IEXCHANGEHEADER-EXCHANGEAGREEMENTCLOSEDATE, sy-vline,
  WA_IEXCHANGEHEADER-EXCHANGEAGREEMENTREVIEWDATE, sy-vline,
  WA_IEXCHANGEHEADER-EXCHANGEAGREEMENTNOTICEPERIOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IEXCHANGEHEADER 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_IEXCHANGEHEADER 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_IEXCHANGEHEADER INTO WA_IEXCHANGEHEADER.


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

*Conversion exit ALPHA, internal->external for field EXCHANGEAGREEMENTPARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IEXCHANGEHEADER-EXCHANGEAGREEMENTPARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IEXCHANGEHEADER-EXCHANGEAGREEMENTPARTNER.
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_IEXCHANGEHEADER_STR, 
MANDT TYPE STRING,
EXCHANGEAGREEMENT TYPE STRING,
EXCHANGEAGREEMENTPARTNER TYPE STRING,
EXCHANGEAGREEMENTTYPE TYPE STRING,
EXCHAGREEMENTPARTNERREFCODE TYPE STRING,
EXCHANGEAGREEMENTSTATUS TYPE STRING,
EXCHANGEAGREEMENTEVERGREENTYPE TYPE STRING,
EXCHANGEAGREEMENTSTARTDATE TYPE STRING,
EXCHANGEAGREEMENTCLOSEDATE TYPE STRING,
EXCHANGEAGREEMENTREVIEWDATE TYPE STRING,
EXCHANGEAGREEMENTNOTICEPERIOD TYPE STRING,
EXCHSUBBASEPRODRLVNCETYPE TYPE STRING,
EXCHSUBBASEPRODEXITROUTINE TYPE STRING,
EXCHANGEAGREEMENTBASELOCATION TYPE STRING,
QUANTITYSCHEDULEBREAKDOWN TYPE STRING,
QUANTITYSCHEDULESPLITTYPE TYPE STRING,
EXCHANGENETTINGCYCLE TYPE STRING,
ISFEECHECKAPPLIED TYPE STRING,
ISVATRELEVANT TYPE STRING,
ISNETTINGACTIVE TYPE STRING,
EXCHANGEAGREEMENTISBLOCKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IEXCHANGEHEADER_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_IEXCHANGEHEADER_STR-MANDT sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENT sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTPARTNER sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTTYPE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHAGREEMENTPARTNERREFCODE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTSTATUS sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTEVERGREENTYPE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTSTARTDATE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTCLOSEDATE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTREVIEWDATE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTNOTICEPERIOD sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHSUBBASEPRODRLVNCETYPE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHSUBBASEPRODEXITROUTINE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTBASELOCATION sy-vline 
WA_IEXCHANGEHEADER_STR-QUANTITYSCHEDULEBREAKDOWN sy-vline 
WA_IEXCHANGEHEADER_STR-QUANTITYSCHEDULESPLITTYPE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGENETTINGCYCLE sy-vline 
WA_IEXCHANGEHEADER_STR-ISFEECHECKAPPLIED sy-vline 
WA_IEXCHANGEHEADER_STR-ISVATRELEVANT sy-vline 
WA_IEXCHANGEHEADER_STR-ISNETTINGACTIVE sy-vline 
WA_IEXCHANGEHEADER_STR-EXCHANGEAGREEMENTISBLOCKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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