ABAP Select data from SAP table CAT_IO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CAT_IO
*  INTO TABLE @DATA(IT_CAT_IO2).
*--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_CAT_IO INDEX 1 INTO DATA(WA_CAT_IO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CAT_IO>-P01 = 1.
<CAT_IO>-P02 = 1.
<CAT_IO>-P03 = 1.
<CAT_IO>-P04 = 1.
<CAT_IO>-P05 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CAT_IO-P06, sy-vline,
  WA_CAT_IO-P07, sy-vline,
  WA_CAT_IO-P08, sy-vline,
  WA_CAT_IO-P09, sy-vline,
  WA_CAT_IO-P10, sy-vline,
  WA_CAT_IO-P11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CAT_IO 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_CAT_IO 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_CAT_IO INTO WA_CAT_IO.


*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_CAT_IO_STR, 
P01 TYPE STRING,
P02 TYPE STRING,
P03 TYPE STRING,
P04 TYPE STRING,
P05 TYPE STRING,
P06 TYPE STRING,
P07 TYPE STRING,
P08 TYPE STRING,
P09 TYPE STRING,
P10 TYPE STRING,
P11 TYPE STRING,
P12 TYPE STRING,
P13 TYPE STRING,
P14 TYPE STRING,
P15 TYPE STRING,
P16 TYPE STRING,
P17 TYPE STRING,
P18 TYPE STRING,
P19 TYPE STRING,
P20 TYPE STRING,
P21 TYPE STRING,
P22 TYPE STRING,
P23 TYPE STRING,
P24 TYPE STRING,
P25 TYPE STRING,
P26 TYPE STRING,
P27 TYPE STRING,
P28 TYPE STRING,
P29 TYPE STRING,
P30 TYPE STRING,
P31 TYPE STRING,
P32 TYPE STRING,
P33 TYPE STRING,
P34 TYPE STRING,
P35 TYPE STRING,
P36 TYPE STRING,
P37 TYPE STRING,
P38 TYPE STRING,
P39 TYPE STRING,
P40 TYPE STRING,
P41 TYPE STRING,
P42 TYPE STRING,
P43 TYPE STRING,
P44 TYPE STRING,
P45 TYPE STRING,
P46 TYPE STRING,
P47 TYPE STRING,
P48 TYPE STRING,
P49 TYPE STRING,
P50 TYPE STRING,
FOUND TYPE STRING,
ABLNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CAT_IO_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_CAT_IO_STR-P01 sy-vline 
WA_CAT_IO_STR-P02 sy-vline 
WA_CAT_IO_STR-P03 sy-vline 
WA_CAT_IO_STR-P04 sy-vline 
WA_CAT_IO_STR-P05 sy-vline 
WA_CAT_IO_STR-P06 sy-vline 
WA_CAT_IO_STR-P07 sy-vline 
WA_CAT_IO_STR-P08 sy-vline 
WA_CAT_IO_STR-P09 sy-vline 
WA_CAT_IO_STR-P10 sy-vline 
WA_CAT_IO_STR-P11 sy-vline 
WA_CAT_IO_STR-P12 sy-vline 
WA_CAT_IO_STR-P13 sy-vline 
WA_CAT_IO_STR-P14 sy-vline 
WA_CAT_IO_STR-P15 sy-vline 
WA_CAT_IO_STR-P16 sy-vline 
WA_CAT_IO_STR-P17 sy-vline 
WA_CAT_IO_STR-P18 sy-vline 
WA_CAT_IO_STR-P19 sy-vline 
WA_CAT_IO_STR-P20 sy-vline 
WA_CAT_IO_STR-P21 sy-vline 
WA_CAT_IO_STR-P22 sy-vline 
WA_CAT_IO_STR-P23 sy-vline 
WA_CAT_IO_STR-P24 sy-vline 
WA_CAT_IO_STR-P25 sy-vline 
WA_CAT_IO_STR-P26 sy-vline 
WA_CAT_IO_STR-P27 sy-vline 
WA_CAT_IO_STR-P28 sy-vline 
WA_CAT_IO_STR-P29 sy-vline 
WA_CAT_IO_STR-P30 sy-vline 
WA_CAT_IO_STR-P31 sy-vline 
WA_CAT_IO_STR-P32 sy-vline 
WA_CAT_IO_STR-P33 sy-vline 
WA_CAT_IO_STR-P34 sy-vline 
WA_CAT_IO_STR-P35 sy-vline 
WA_CAT_IO_STR-P36 sy-vline 
WA_CAT_IO_STR-P37 sy-vline 
WA_CAT_IO_STR-P38 sy-vline 
WA_CAT_IO_STR-P39 sy-vline 
WA_CAT_IO_STR-P40 sy-vline 
WA_CAT_IO_STR-P41 sy-vline 
WA_CAT_IO_STR-P42 sy-vline 
WA_CAT_IO_STR-P43 sy-vline 
WA_CAT_IO_STR-P44 sy-vline 
WA_CAT_IO_STR-P45 sy-vline 
WA_CAT_IO_STR-P46 sy-vline 
WA_CAT_IO_STR-P47 sy-vline 
WA_CAT_IO_STR-P48 sy-vline 
WA_CAT_IO_STR-P49 sy-vline 
WA_CAT_IO_STR-P50 sy-vline 
WA_CAT_IO_STR-FOUND sy-vline 
WA_CAT_IO_STR-ABLNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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