ABAP Select data from SAP table GGREFO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GGREFO
*  INTO TABLE @DATA(IT_GGREFO2).
*--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_GGREFO INDEX 1 INTO DATA(WA_GGREFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GGREFO>-MANDT = 1.
<GGREFO>-OBJNR = 1.
<GGREFO>-DATIV = 1.
<GGREFO>-DATIB = 1.
<GGREFO>-DATPV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GGREFO-DATPB, sy-vline,
  WA_GGREFO-COMP, sy-vline,
  WA_GGREFO-OBUKRS, sy-vline,
  WA_GGREFO-ACCT, sy-vline,
  WA_GGREFO-BUSA, sy-vline,
  WA_GGREFO-CNTR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GGREFO 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_GGREFO 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_GGREFO INTO WA_GGREFO.


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

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

*Conversion exit ALPHA, internal->external for field CNTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GGREFO-CNTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GGREFO-CNTR.
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_GGREFO_STR, 
MANDT TYPE STRING,
OBJNR TYPE STRING,
DATIV TYPE STRING,
DATIB TYPE STRING,
DATPV TYPE STRING,
DATPB TYPE STRING,
COMP TYPE STRING,
OBUKRS TYPE STRING,
ACCT TYPE STRING,
BUSA TYPE STRING,
CNTR TYPE STRING,
FAREA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GGREFO_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_GGREFO_STR-MANDT sy-vline 
WA_GGREFO_STR-OBJNR sy-vline 
WA_GGREFO_STR-DATIV sy-vline 
WA_GGREFO_STR-DATIB sy-vline 
WA_GGREFO_STR-DATPV sy-vline 
WA_GGREFO_STR-DATPB sy-vline 
WA_GGREFO_STR-COMP sy-vline 
WA_GGREFO_STR-OBUKRS sy-vline 
WA_GGREFO_STR-ACCT sy-vline 
WA_GGREFO_STR-BUSA sy-vline 
WA_GGREFO_STR-CNTR sy-vline 
WA_GGREFO_STR-FAREA sy-vline      INTO ld_text SEPARATED BY SPACE.

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