ABAP Select data from SAP table DTC_S_FCAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTC_S_FCAT
*  INTO TABLE @DATA(IT_DTC_S_FCAT2).
*--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_DTC_S_FCAT INDEX 1 INTO DATA(WA_DTC_S_FCAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTC_S_FCAT>-COL_HEADER = 1.
<DTC_S_FCAT>-FIELDNAME = 1.
<DTC_S_FCAT>-COL_KEY = 1.
<DTC_S_FCAT>-COL_TECH = 1.
<DTC_S_FCAT>-ACTIVE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTC_S_FCAT-NO_DISPLAY, sy-vline,
  WA_DTC_S_FCAT-INTLEN, sy-vline,
  WA_DTC_S_FCAT-DDCLEN, sy-vline,
  WA_DTC_S_FCAT-OUTPUTLEN, sy-vline,
  WA_DTC_S_FCAT-OFFSET, sy-vline,
  WA_DTC_S_FCAT-DATATYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTC_S_FCAT 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_DTC_S_FCAT 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_DTC_S_FCAT INTO WA_DTC_S_FCAT.


*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_DTC_S_FCAT-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DTC_S_FCAT-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_DTC_S_FCAT_STR, 
COL_HEADER TYPE STRING,
FIELDNAME TYPE STRING,
COL_KEY TYPE STRING,
COL_TECH TYPE STRING,
ACTIVE TYPE STRING,
NO_DISPLAY TYPE STRING,
INTLEN TYPE STRING,
DDCLEN TYPE STRING,
OUTPUTLEN TYPE STRING,
OFFSET TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
CHECKBT TYPE STRING,
ICON TYPE STRING,
RADIO TYPE STRING,
NO_INPUT TYPE STRING,
MARK TYPE STRING,
TECHNAME TYPE STRING,
STRUCT TYPE STRING,
APPEARS TYPE STRING,
FLG_TECH TYPE STRING,
INPCHK_FLD TYPE STRING,
INPFLD_EX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTC_S_FCAT_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_DTC_S_FCAT_STR-COL_HEADER sy-vline 
WA_DTC_S_FCAT_STR-FIELDNAME sy-vline 
WA_DTC_S_FCAT_STR-COL_KEY sy-vline 
WA_DTC_S_FCAT_STR-COL_TECH sy-vline 
WA_DTC_S_FCAT_STR-ACTIVE sy-vline 
WA_DTC_S_FCAT_STR-NO_DISPLAY sy-vline 
WA_DTC_S_FCAT_STR-INTLEN sy-vline 
WA_DTC_S_FCAT_STR-DDCLEN sy-vline 
WA_DTC_S_FCAT_STR-OUTPUTLEN sy-vline 
WA_DTC_S_FCAT_STR-OFFSET sy-vline 
WA_DTC_S_FCAT_STR-DATATYPE sy-vline 
WA_DTC_S_FCAT_STR-INTTYPE sy-vline 
WA_DTC_S_FCAT_STR-CHECKBT sy-vline 
WA_DTC_S_FCAT_STR-ICON sy-vline 
WA_DTC_S_FCAT_STR-RADIO sy-vline 
WA_DTC_S_FCAT_STR-NO_INPUT sy-vline 
WA_DTC_S_FCAT_STR-MARK sy-vline 
WA_DTC_S_FCAT_STR-TECHNAME sy-vline 
WA_DTC_S_FCAT_STR-STRUCT sy-vline 
WA_DTC_S_FCAT_STR-APPEARS sy-vline 
WA_DTC_S_FCAT_STR-FLG_TECH sy-vline 
WA_DTC_S_FCAT_STR-INPCHK_FLD sy-vline 
WA_DTC_S_FCAT_STR-INPFLD_EX sy-vline      INTO ld_text SEPARATED BY SPACE.

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