ABAP Select data from SAP table /ACCGO/ADD_REF_FIELDS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ACCGO/ADD_REF_FIELDS 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 /ACCGO/ADD_REF_FIELDS. 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 /ACCGO/ADD_REF_FIELDS 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_/ACCGO/ADD_REF_FIELDS TYPE STANDARD TABLE OF /ACCGO/ADD_REF_FIELDS,
      WA_/ACCGO/ADD_REF_FIELDS TYPE /ACCGO/ADD_REF_FIELDS,
      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: </ACCGO/ADD_REF_FIELDS> TYPE /ACCGO/ADD_REF_FIELDS.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ACCGO/ADD_REF_FIELDS
  INTO TABLE IT_/ACCGO/ADD_REF_FIELDS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ACCGO/ADD_REF_FIELDS
*  INTO TABLE @DATA(IT_/ACCGO/ADD_REF_FIELDS2).
*--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_/ACCGO/ADD_REF_FIELDS INDEX 1 INTO DATA(WA_/ACCGO/ADD_REF_FIELDS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ACCGO/ADD_REF_FIELDS ASSIGNING </ACCGO/ADD_REF_FIELDS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ACCGO/ADD_REF_FIELDS>-REF_DOC = 1.
</ACCGO/ADD_REF_FIELDS>-REF_DOC_ITM = 1.
</ACCGO/ADD_REF_FIELDS>-REF_DOC_TYPE = 1.
</ACCGO/ADD_REF_FIELDS>-REF_DOC_YEAR = 1.
</ACCGO/ADD_REF_FIELDS>-REF_GUID = 1.

ENDLOOP.

LOOP AT IT_/ACCGO/ADD_REF_FIELDS INTO WA_/ACCGO/ADD_REF_FIELDS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ACCGO/ADD_REF_FIELDS-SPLIT_LINE, sy-vline,
  WA_/ACCGO/ADD_REF_FIELDS-UIS_ID, sy-vline,
  WA_/ACCGO/ADD_REF_FIELDS-EVENT_TYPE, sy-vline,
  WA_/ACCGO/ADD_REF_FIELDS-QREP_GUID, sy-vline,
  WA_/ACCGO/ADD_REF_FIELDS-QREP_VERSION, sy-vline,
  WA_/ACCGO/ADD_REF_FIELDS-NET_QUAN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ACCGO/ADD_REF_FIELDS 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_/ACCGO/ADD_REF_FIELDS 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_/ACCGO/ADD_REF_FIELDS INTO WA_/ACCGO/ADD_REF_FIELDS.


*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 REF_DOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/ADD_REF_FIELDS-REF_DOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/ADD_REF_FIELDS-REF_DOC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field REF_DOC_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/ADD_REF_FIELDS-REF_DOC_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/ADD_REF_FIELDS-REF_DOC_YEAR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field SOURCEDOCIN10CHAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/ADD_REF_FIELDS-SOURCEDOCIN10CHAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/ADD_REF_FIELDS-SOURCEDOCIN10CHAR.
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_/ACCGO/ADD_REF_FIELDS_STR, 
REF_DOC TYPE STRING,
REF_DOC_ITM TYPE STRING,
REF_DOC_TYPE TYPE STRING,
REF_DOC_YEAR TYPE STRING,
REF_GUID TYPE STRING,
SPLIT_LINE TYPE STRING,
UIS_ID TYPE STRING,
EVENT_TYPE TYPE STRING,
QREP_GUID TYPE STRING,
QREP_VERSION TYPE STRING,
NET_QUAN TYPE STRING,
NET_QUAN_COMM TYPE STRING,
NET_QUAN_MASS TYPE STRING,
NET_QUAN_VOLUME TYPE STRING,
GROSS_QUAN_IN_SLOC TYPE STRING,
DPQS_ID TYPE STRING,
VERSION TYPE STRING,
SCHEDULE_GUID TYPE STRING,
EVAL_VOL TYPE STRING,
LOGICALLY_DEL_STAT TYPE STRING,
ERROR_CODE TYPE STRING,
DPQS_TYPE TYPE STRING,
BATCH_MERGE TYPE STRING,
VALUE_ADJUSTMENT TYPE STRING,
VALUE_ADJ_CURR TYPE STRING,
SOURCEDOCIN10CHAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ACCGO/ADD_REF_FIELDS_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_/ACCGO/ADD_REF_FIELDS_STR-REF_DOC sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-REF_DOC_ITM sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-REF_DOC_TYPE sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-REF_DOC_YEAR sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-REF_GUID sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-SPLIT_LINE sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-UIS_ID sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-EVENT_TYPE sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-QREP_GUID sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-QREP_VERSION sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-NET_QUAN sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-NET_QUAN_COMM sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-NET_QUAN_MASS sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-NET_QUAN_VOLUME sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-GROSS_QUAN_IN_SLOC sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-DPQS_ID sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-VERSION sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-SCHEDULE_GUID sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-EVAL_VOL sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-LOGICALLY_DEL_STAT sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-ERROR_CODE sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-DPQS_TYPE sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-BATCH_MERGE sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-VALUE_ADJUSTMENT sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-VALUE_ADJ_CURR sy-vline 
WA_/ACCGO/ADD_REF_FIELDS_STR-SOURCEDOCIN10CHAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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