ABAP Select data from SAP table DFKKRA_LEGACY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DFKKRA_LEGACY
*  INTO TABLE @DATA(IT_DFKKRA_LEGACY2).
*--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_DFKKRA_LEGACY INDEX 1 INTO DATA(WA_DFKKRA_LEGACY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DFKKRA_LEGACY>-MANDT = 1.
<DFKKRA_LEGACY>-SRCDOC_COMP = 1.
<DFKKRA_LEGACY>-SRCDOC_LOGSYS = 1.
<DFKKRA_LEGACY>-SRCDOC_TYPE = 1.
<DFKKRA_LEGACY>-SRCDOC_ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DFKKRA_LEGACY-ACCT_PRINCIPLE, sy-vline,
  WA_DFKKRA_LEGACY-SENTDATE, sy-vline,
  WA_DFKKRA_LEGACY-QUANTITY_FULFILL, sy-vline,
  WA_DFKKRA_LEGACY-QUANTITY_UNIT, sy-vline,
  WA_DFKKRA_LEGACY-POB_NAME, sy-vline,
  WA_DFKKRA_LEGACY-POB_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DFKKRA_LEGACY 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_DFKKRA_LEGACY 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_DFKKRA_LEGACY INTO WA_DFKKRA_LEGACY.


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

*Conversion exit CUNIT, internal->external for field QUANTITY_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_DFKKRA_LEGACY-QUANTITY_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DFKKRA_LEGACY-QUANTITY_UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DURATION_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_DFKKRA_LEGACY-DURATION_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DFKKRA_LEGACY-DURATION_UNIT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit EXCRT, internal->external for field EXCHANGE_RATE2
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_DFKKRA_LEGACY-EXCHANGE_RATE2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DFKKRA_LEGACY-EXCHANGE_RATE2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field EXCHANGE_RATE3
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_DFKKRA_LEGACY-EXCHANGE_RATE3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DFKKRA_LEGACY-EXCHANGE_RATE3.
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_DFKKRA_LEGACY_STR, 
MANDT TYPE STRING,
SRCDOC_COMP TYPE STRING,
SRCDOC_LOGSYS TYPE STRING,
SRCDOC_TYPE TYPE STRING,
SRCDOC_ID TYPE STRING,
ACCT_PRINCIPLE TYPE STRING,
SENTDATE TYPE STRING,
QUANTITY_FULFILL TYPE STRING,
QUANTITY_UNIT TYPE STRING,
POB_NAME TYPE STRING,
POB_TYPE TYPE STRING,
RESIDUAL_POB TYPE STRING,
FULFILL_TYPE TYPE STRING,
EVENT_TYPE TYPE STRING,
DEFERRAL_METHOD TYPE STRING,
DURATION TYPE STRING,
DURATION_UNIT TYPE STRING,
PREVENT_ALLOC TYPE STRING,
START_DATE_TYPE TYPE STRING,
STATUS TYPE STRING,
REVIEW_REASON TYPE STRING,
REVIEW_DATE TYPE STRING,
SSP TYPE STRING,
WAERS TYPE STRING,
SSP_RANGE_PERC TYPE STRING,
SSP_RANGE_AMOUNT TYPE STRING,
CONTRACT_CAT TYPE STRING,
MANUAL_ALLOCATED TYPE STRING,
ALLOC_DIFFERENCE TYPE STRING,
NO_RECOG TYPE STRING,
EXCHANGE_RATE TYPE STRING,
EXCHANGE_RATE2 TYPE STRING,
EXCHANGE_RATE3 TYPE STRING,
BUKRS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DFKKRA_LEGACY_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_DFKKRA_LEGACY_STR-MANDT sy-vline 
WA_DFKKRA_LEGACY_STR-SRCDOC_COMP sy-vline 
WA_DFKKRA_LEGACY_STR-SRCDOC_LOGSYS sy-vline 
WA_DFKKRA_LEGACY_STR-SRCDOC_TYPE sy-vline 
WA_DFKKRA_LEGACY_STR-SRCDOC_ID sy-vline 
WA_DFKKRA_LEGACY_STR-ACCT_PRINCIPLE sy-vline 
WA_DFKKRA_LEGACY_STR-SENTDATE sy-vline 
WA_DFKKRA_LEGACY_STR-QUANTITY_FULFILL sy-vline 
WA_DFKKRA_LEGACY_STR-QUANTITY_UNIT sy-vline 
WA_DFKKRA_LEGACY_STR-POB_NAME sy-vline 
WA_DFKKRA_LEGACY_STR-POB_TYPE sy-vline 
WA_DFKKRA_LEGACY_STR-RESIDUAL_POB sy-vline 
WA_DFKKRA_LEGACY_STR-FULFILL_TYPE sy-vline 
WA_DFKKRA_LEGACY_STR-EVENT_TYPE sy-vline 
WA_DFKKRA_LEGACY_STR-DEFERRAL_METHOD sy-vline 
WA_DFKKRA_LEGACY_STR-DURATION sy-vline 
WA_DFKKRA_LEGACY_STR-DURATION_UNIT sy-vline 
WA_DFKKRA_LEGACY_STR-PREVENT_ALLOC sy-vline 
WA_DFKKRA_LEGACY_STR-START_DATE_TYPE sy-vline 
WA_DFKKRA_LEGACY_STR-STATUS sy-vline 
WA_DFKKRA_LEGACY_STR-REVIEW_REASON sy-vline 
WA_DFKKRA_LEGACY_STR-REVIEW_DATE sy-vline 
WA_DFKKRA_LEGACY_STR-SSP sy-vline 
WA_DFKKRA_LEGACY_STR-WAERS sy-vline 
WA_DFKKRA_LEGACY_STR-SSP_RANGE_PERC sy-vline 
WA_DFKKRA_LEGACY_STR-SSP_RANGE_AMOUNT sy-vline 
WA_DFKKRA_LEGACY_STR-CONTRACT_CAT sy-vline 
WA_DFKKRA_LEGACY_STR-MANUAL_ALLOCATED sy-vline 
WA_DFKKRA_LEGACY_STR-ALLOC_DIFFERENCE sy-vline 
WA_DFKKRA_LEGACY_STR-NO_RECOG sy-vline 
WA_DFKKRA_LEGACY_STR-EXCHANGE_RATE sy-vline 
WA_DFKKRA_LEGACY_STR-EXCHANGE_RATE2 sy-vline 
WA_DFKKRA_LEGACY_STR-EXCHANGE_RATE3 sy-vline 
WA_DFKKRA_LEGACY_STR-BUKRS sy-vline      INTO ld_text SEPARATED BY SPACE.

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