ABAP Select data from SAP table GFC_CLSFLD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GFC_CLSFLD
*  INTO TABLE @DATA(IT_GFC_CLSFLD2).
*--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_GFC_CLSFLD INDEX 1 INTO DATA(WA_GFC_CLSFLD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GFC_CLSFLD>-FELDNAME = 1.
<GFC_CLSFLD>-INTTYP = 1.
<GFC_CLSFLD>-FELDFORMAT = 1.
<GFC_CLSFLD>-LAENGE = 1.
<GFC_CLSFLD>-FLG1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GFC_CLSFLD-FLG2, sy-vline,
  WA_GFC_CLSFLD-FLG3, sy-vline,
  WA_GFC_CLSFLD-FMB1, sy-vline,
  WA_GFC_CLSFLD-FMB2, sy-vline,
  WA_GFC_CLSFLD-ALLOWED, sy-vline,
  WA_GFC_CLSFLD-PAID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GFC_CLSFLD 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_GFC_CLSFLD 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_GFC_CLSFLD INTO WA_GFC_CLSFLD.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_GFC_CLSFLD_STR, 
FELDNAME TYPE STRING,
INTTYP TYPE STRING,
FELDFORMAT TYPE STRING,
LAENGE TYPE STRING,
FLG1 TYPE STRING,
FLG2 TYPE STRING,
FLG3 TYPE STRING,
FMB1 TYPE STRING,
FMB2 TYPE STRING,
ALLOWED TYPE STRING,
PAID TYPE STRING,
UCNV TYPE STRING,
AGLT TYPE STRING,
ADEZ TYPE STRING,
AUTH TYPE STRING,
WNAM TYPE STRING,
FIELDTEXT TYPE STRING,
HEADLEN TYPE STRING,
REPTEXT TYPE STRING,
SCRLEN1 TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRLEN2 TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRLEN3 TYPE STRING,
SCRTEXT_L TYPE STRING,
RES1 TYPE STRING,
READONLY TYPE STRING,
DCLTYPE TYPE STRING,
EXPOSURE TYPE STRING,
REFTYPE TYPE STRING,
REFNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GFC_CLSFLD_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_GFC_CLSFLD_STR-FELDNAME sy-vline 
WA_GFC_CLSFLD_STR-INTTYP sy-vline 
WA_GFC_CLSFLD_STR-FELDFORMAT sy-vline 
WA_GFC_CLSFLD_STR-LAENGE sy-vline 
WA_GFC_CLSFLD_STR-FLG1 sy-vline 
WA_GFC_CLSFLD_STR-FLG2 sy-vline 
WA_GFC_CLSFLD_STR-FLG3 sy-vline 
WA_GFC_CLSFLD_STR-FMB1 sy-vline 
WA_GFC_CLSFLD_STR-FMB2 sy-vline 
WA_GFC_CLSFLD_STR-ALLOWED sy-vline 
WA_GFC_CLSFLD_STR-PAID sy-vline 
WA_GFC_CLSFLD_STR-UCNV sy-vline 
WA_GFC_CLSFLD_STR-AGLT sy-vline 
WA_GFC_CLSFLD_STR-ADEZ sy-vline 
WA_GFC_CLSFLD_STR-AUTH sy-vline 
WA_GFC_CLSFLD_STR-WNAM sy-vline 
WA_GFC_CLSFLD_STR-FIELDTEXT sy-vline 
WA_GFC_CLSFLD_STR-HEADLEN sy-vline 
WA_GFC_CLSFLD_STR-REPTEXT sy-vline 
WA_GFC_CLSFLD_STR-SCRLEN1 sy-vline 
WA_GFC_CLSFLD_STR-SCRTEXT_S sy-vline 
WA_GFC_CLSFLD_STR-SCRLEN2 sy-vline 
WA_GFC_CLSFLD_STR-SCRTEXT_M sy-vline 
WA_GFC_CLSFLD_STR-SCRLEN3 sy-vline 
WA_GFC_CLSFLD_STR-SCRTEXT_L sy-vline 
WA_GFC_CLSFLD_STR-RES1 sy-vline 
WA_GFC_CLSFLD_STR-READONLY sy-vline 
WA_GFC_CLSFLD_STR-DCLTYPE sy-vline 
WA_GFC_CLSFLD_STR-EXPOSURE sy-vline 
WA_GFC_CLSFLD_STR-REFTYPE sy-vline 
WA_GFC_CLSFLD_STR-REFNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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