ABAP Select data from SAP table EXCHANGE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EXCHANGE
*  INTO TABLE @DATA(IT_EXCHANGE2).
*--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_EXCHANGE INDEX 1 INTO DATA(WA_EXCHANGE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EXCHANGE>-I_FCURR = 1.
<EXCHANGE>-I_TCURR = 1.
<EXCHANGE>-I_RKURSBER = 1.
<EXCHANGE>-I_RKURSART = 1.
<EXCHANGE>-I_RKURSTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EXCHANGE-I_RKURSHDL, sy-vline,
  WA_EXCHANGE-I_GDATU, sy-vline,
  WA_EXCHANGE-I_BBETRAG1, sy-vline,
  WA_EXCHANGE-I_SEEK, sy-vline,
  WA_EXCHANGE-I_KURS, sy-vline,
  WA_EXCHANGE-I_MWAER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EXCHANGE 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_EXCHANGE 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_EXCHANGE INTO WA_EXCHANGE.


*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 INVDT, internal->external for field I_GDATU
CALL FUNCTION 'CONVERSION_EXIT_INVDT_OUTPUT'
  EXPORTING
    input =                      WA_EXCHANGE-I_GDATU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EXCHANGE-I_GDATU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field I_KURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_EXCHANGE-I_KURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EXCHANGE-I_KURS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field O_SPREAD
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_EXCHANGE-O_SPREAD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EXCHANGE-O_SPREAD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit INVDT, internal->external for field O_GDATU
CALL FUNCTION 'CONVERSION_EXIT_INVDT_OUTPUT'
  EXPORTING
    input =                      WA_EXCHANGE-O_GDATU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EXCHANGE-O_GDATU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field O_KURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_EXCHANGE-O_KURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EXCHANGE-O_KURS.
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_EXCHANGE_STR, 
I_FCURR TYPE STRING,
I_TCURR TYPE STRING,
I_RKURSBER TYPE STRING,
I_RKURSART TYPE STRING,
I_RKURSTYP TYPE STRING,
I_RKURSHDL TYPE STRING,
I_GDATU TYPE STRING,
I_BBETRAG1 TYPE STRING,
I_SEEK TYPE STRING,
I_KURS TYPE STRING,
I_MWAER TYPE STRING,
O_RKURSART TYPE STRING,
O_RKURSTYP TYPE STRING,
O_RKURSHDL TYPE STRING,
O_SPREAD TYPE STRING,
O_XKURSHK TYPE STRING,
O_GDATU TYPE STRING,
O_KURS TYPE STRING,
O_BBETRAG2 TYPE STRING,
O_CURRDEC TYPE STRING,
O_FFACT TYPE STRING,
O_TFACT TYPE STRING,
O_SEEK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EXCHANGE_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_EXCHANGE_STR-I_FCURR sy-vline 
WA_EXCHANGE_STR-I_TCURR sy-vline 
WA_EXCHANGE_STR-I_RKURSBER sy-vline 
WA_EXCHANGE_STR-I_RKURSART sy-vline 
WA_EXCHANGE_STR-I_RKURSTYP sy-vline 
WA_EXCHANGE_STR-I_RKURSHDL sy-vline 
WA_EXCHANGE_STR-I_GDATU sy-vline 
WA_EXCHANGE_STR-I_BBETRAG1 sy-vline 
WA_EXCHANGE_STR-I_SEEK sy-vline 
WA_EXCHANGE_STR-I_KURS sy-vline 
WA_EXCHANGE_STR-I_MWAER sy-vline 
WA_EXCHANGE_STR-O_RKURSART sy-vline 
WA_EXCHANGE_STR-O_RKURSTYP sy-vline 
WA_EXCHANGE_STR-O_RKURSHDL sy-vline 
WA_EXCHANGE_STR-O_SPREAD sy-vline 
WA_EXCHANGE_STR-O_XKURSHK sy-vline 
WA_EXCHANGE_STR-O_GDATU sy-vline 
WA_EXCHANGE_STR-O_KURS sy-vline 
WA_EXCHANGE_STR-O_BBETRAG2 sy-vline 
WA_EXCHANGE_STR-O_CURRDEC sy-vline 
WA_EXCHANGE_STR-O_FFACT sy-vline 
WA_EXCHANGE_STR-O_TFACT sy-vline 
WA_EXCHANGE_STR-O_SEEK sy-vline      INTO ld_text SEPARATED BY SPACE.

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