ABAP Select data from SAP table CATFU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATFU
*  INTO TABLE @DATA(IT_CATFU2).
*--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_CATFU INDEX 1 INTO DATA(WA_CATFU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATFU>-PARAMTYPE = 1.
<CATFU>-NAME = 1.
<CATFU>-TABNAME = 1.
<CATFU>-FIELDNAME = 1.
<CATFU>-DATATYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATFU-INTTYPE, sy-vline,
  WA_CATFU-DDLEN, sy-vline,
  WA_CATFU-INTLEN, sy-vline,
  WA_CATFU-DECIMALS, sy-vline,
  WA_CATFU-LOWERCASE, sy-vline,
  WA_CATFU-SIGN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATFU 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_CATFU 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_CATFU INTO WA_CATFU.


*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_CATFU-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATFU-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_CATFU_STR, 
PARAMTYPE TYPE STRING,
NAME TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
DDLEN TYPE STRING,
INTLEN TYPE STRING,
DECIMALS TYPE STRING,
LOWERCASE TYPE STRING,
SIGN TYPE STRING,
TEXT TYPE STRING,
IMPDEFAULT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATFU_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_CATFU_STR-PARAMTYPE sy-vline 
WA_CATFU_STR-NAME sy-vline 
WA_CATFU_STR-TABNAME sy-vline 
WA_CATFU_STR-FIELDNAME sy-vline 
WA_CATFU_STR-DATATYPE sy-vline 
WA_CATFU_STR-INTTYPE sy-vline 
WA_CATFU_STR-DDLEN sy-vline 
WA_CATFU_STR-INTLEN sy-vline 
WA_CATFU_STR-DECIMALS sy-vline 
WA_CATFU_STR-LOWERCASE sy-vline 
WA_CATFU_STR-SIGN sy-vline 
WA_CATFU_STR-TEXT sy-vline 
WA_CATFU_STR-IMPDEFAULT sy-vline      INTO ld_text SEPARATED BY SPACE.

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