ABAP Select data from SAP table CATF into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CATF 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 CATF. 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 CATF 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_CATF TYPE STANDARD TABLE OF CATF,
      WA_CATF TYPE CATF,
      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: <CATF> TYPE CATF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATF
*  INTO TABLE @DATA(IT_CATF2).
*--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_CATF INDEX 1 INTO DATA(WA_CATF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATF>-ABLNR = 1.
<CATF>-LFDNR = 1.
<CATF>-SUBNR = 1.
<CATF>-INAKT = 1.
<CATF>-INAKS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATF-FKTC, sy-vline,
  WA_CATF-REFNR, sy-vline,
  WA_CATF-TABNA, sy-vline,
  WA_CATF-WKENN, sy-vline,
  WA_CATF-TCODE, sy-vline,
  WA_CATF-DYNNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATF 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_CATF 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_CATF INTO WA_CATF.


*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_CATF_STR, 
ABLNR TYPE STRING,
LFDNR TYPE STRING,
SUBNR TYPE STRING,
INAKT TYPE STRING,
INAKS TYPE STRING,
FKTC TYPE STRING,
REFNR TYPE STRING,
TABNA TYPE STRING,
WKENN TYPE STRING,
TCODE TYPE STRING,
DYNNR TYPE STRING,
MPOOL TYPE STRING,
FBAU TYPE STRING,
FCOD1 TYPE STRING,
FCOD2 TYPE STRING,
OCCUR TYPE STRING,
COMMT TYPE STRING,
VARF1 TYPE STRING,
VARF2 TYPE STRING,
VARF3 TYPE STRING,
VARF4 TYPE STRING,
VARF5 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATF_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_CATF_STR-ABLNR sy-vline 
WA_CATF_STR-LFDNR sy-vline 
WA_CATF_STR-SUBNR sy-vline 
WA_CATF_STR-INAKT sy-vline 
WA_CATF_STR-INAKS sy-vline 
WA_CATF_STR-FKTC sy-vline 
WA_CATF_STR-REFNR sy-vline 
WA_CATF_STR-TABNA sy-vline 
WA_CATF_STR-WKENN sy-vline 
WA_CATF_STR-TCODE sy-vline 
WA_CATF_STR-DYNNR sy-vline 
WA_CATF_STR-MPOOL sy-vline 
WA_CATF_STR-FBAU sy-vline 
WA_CATF_STR-FCOD1 sy-vline 
WA_CATF_STR-FCOD2 sy-vline 
WA_CATF_STR-OCCUR sy-vline 
WA_CATF_STR-COMMT sy-vline 
WA_CATF_STR-VARF1 sy-vline 
WA_CATF_STR-VARF2 sy-vline 
WA_CATF_STR-VARF3 sy-vline 
WA_CATF_STR-VARF4 sy-vline 
WA_CATF_STR-VARF5 sy-vline      INTO ld_text SEPARATED BY SPACE.

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