ABAP Select data from SAP table GFD_FIELD_INFO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GFD_FIELD_INFO
*  INTO TABLE @DATA(IT_GFD_FIELD_INFO2).
*--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_GFD_FIELD_INFO INDEX 1 INTO DATA(WA_GFD_FIELD_INFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GFD_FIELD_INFO>-CONTEXT_ID = 1.
<GFD_FIELD_INFO>-TABNAME = 1.
<GFD_FIELD_INFO>-FIELDNAME = 1.
<GFD_FIELD_INFO>-LANGU = 1.
<GFD_FIELD_INFO>-DOMNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GFD_FIELD_INFO-ROLLNAME, sy-vline,
  WA_GFD_FIELD_INFO-CHECKTABLE, sy-vline,
  WA_GFD_FIELD_INFO-LENG, sy-vline,
  WA_GFD_FIELD_INFO-INTLEN, sy-vline,
  WA_GFD_FIELD_INFO-OUTPUTLEN, sy-vline,
  WA_GFD_FIELD_INFO-DECIMALS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GFD_FIELD_INFO 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_GFD_FIELD_INFO 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_GFD_FIELD_INFO INTO WA_GFD_FIELD_INFO.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_GFD_FIELD_INFO-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GFD_FIELD_INFO-DATATYPE.
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_GFD_FIELD_INFO_STR, 
CONTEXT_ID TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
LANGU TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
CHECKTABLE TYPE STRING,
LENG TYPE STRING,
INTLEN TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
REFTABLE TYPE STRING,
REFFIELD TYPE STRING,
PRECFIELD TYPE STRING,
CONVEXIT TYPE STRING,
HEADLEN TYPE STRING,
FIELDTEXT TYPE STRING,
REPTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
KEYFLAG TYPE STRING,
LOWERCASE TYPE STRING,
MAC TYPE STRING,
VALEXI TYPE STRING,
NOAUTHCH TYPE STRING,
SIGN TYPE STRING,
F4AVAILABL TYPE STRING,
LFIELDNAME TYPE STRING,
CONFIG_MAPPING TYPE STRING,
PARAMTYPE TYPE STRING,
TABNAME_TEXT TYPE STRING,
DEPENDENTFIELD TYPE STRING,
MULTIDEPENDENTFIELD TYPE STRING,
MULTICHILDFIELD TYPE STRING,
QUESTION_TYPE TYPE STRING,
CHECK_REQUIRED TYPE STRING,
CHILDFIELD TYPE STRING,
VALIDATION_TYPE TYPE STRING,
DISABLE_IND TYPE STRING,
FORM_ID TYPE STRING,
NOCACHEIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GFD_FIELD_INFO_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_GFD_FIELD_INFO_STR-CONTEXT_ID sy-vline 
WA_GFD_FIELD_INFO_STR-TABNAME sy-vline 
WA_GFD_FIELD_INFO_STR-FIELDNAME sy-vline 
WA_GFD_FIELD_INFO_STR-LANGU sy-vline 
WA_GFD_FIELD_INFO_STR-DOMNAME sy-vline 
WA_GFD_FIELD_INFO_STR-ROLLNAME sy-vline 
WA_GFD_FIELD_INFO_STR-CHECKTABLE sy-vline 
WA_GFD_FIELD_INFO_STR-LENG sy-vline 
WA_GFD_FIELD_INFO_STR-INTLEN sy-vline 
WA_GFD_FIELD_INFO_STR-OUTPUTLEN sy-vline 
WA_GFD_FIELD_INFO_STR-DECIMALS sy-vline 
WA_GFD_FIELD_INFO_STR-DATATYPE sy-vline 
WA_GFD_FIELD_INFO_STR-INTTYPE sy-vline 
WA_GFD_FIELD_INFO_STR-REFTABLE sy-vline 
WA_GFD_FIELD_INFO_STR-REFFIELD sy-vline 
WA_GFD_FIELD_INFO_STR-PRECFIELD sy-vline 
WA_GFD_FIELD_INFO_STR-CONVEXIT sy-vline 
WA_GFD_FIELD_INFO_STR-HEADLEN sy-vline 
WA_GFD_FIELD_INFO_STR-FIELDTEXT sy-vline 
WA_GFD_FIELD_INFO_STR-REPTEXT sy-vline 
WA_GFD_FIELD_INFO_STR-SCRTEXT_S sy-vline 
WA_GFD_FIELD_INFO_STR-SCRTEXT_M sy-vline 
WA_GFD_FIELD_INFO_STR-SCRTEXT_L sy-vline 
WA_GFD_FIELD_INFO_STR-KEYFLAG sy-vline 
WA_GFD_FIELD_INFO_STR-LOWERCASE sy-vline 
WA_GFD_FIELD_INFO_STR-MAC sy-vline 
WA_GFD_FIELD_INFO_STR-VALEXI sy-vline 
WA_GFD_FIELD_INFO_STR-NOAUTHCH sy-vline 
WA_GFD_FIELD_INFO_STR-SIGN sy-vline 
WA_GFD_FIELD_INFO_STR-F4AVAILABL sy-vline 
WA_GFD_FIELD_INFO_STR-LFIELDNAME sy-vline 
WA_GFD_FIELD_INFO_STR-CONFIG_MAPPING sy-vline 
WA_GFD_FIELD_INFO_STR-PARAMTYPE sy-vline 
WA_GFD_FIELD_INFO_STR-TABNAME_TEXT sy-vline 
WA_GFD_FIELD_INFO_STR-DEPENDENTFIELD sy-vline 
WA_GFD_FIELD_INFO_STR-MULTIDEPENDENTFIELD sy-vline 
WA_GFD_FIELD_INFO_STR-MULTICHILDFIELD sy-vline 
WA_GFD_FIELD_INFO_STR-QUESTION_TYPE sy-vline 
WA_GFD_FIELD_INFO_STR-CHECK_REQUIRED sy-vline 
WA_GFD_FIELD_INFO_STR-CHILDFIELD sy-vline 
WA_GFD_FIELD_INFO_STR-VALIDATION_TYPE sy-vline 
WA_GFD_FIELD_INFO_STR-DISABLE_IND sy-vline 
WA_GFD_FIELD_INFO_STR-FORM_ID sy-vline 
WA_GFD_FIELD_INFO_STR-NOCACHEIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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