ABAP Select data from SAP table CATL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATL
*  INTO TABLE @DATA(IT_CATL2).
*--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_CATL INDEX 1 INTO DATA(WA_CATL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATL>-LVORN = 1.
<CATL>-LABLN = 1.
<CATL>-ABLNR = 1.
<CATL>-ERRCD = 1.
<CATL>-EZEIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATL-REFNR, sy-vline,
  WA_CATL-FKTC, sy-vline,
  WA_CATL-OBJCT, sy-vline,
  WA_CATL-MSID1, sy-vline,
  WA_CATL-MSNR1, sy-vline,
  WA_CATL-MSID2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATL 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_CATL 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_CATL INTO WA_CATL.


*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_CATL_STR, 
LVORN TYPE STRING,
LABLN TYPE STRING,
ABLNR TYPE STRING,
ERRCD TYPE STRING,
EZEIT TYPE STRING,
REFNR TYPE STRING,
FKTC TYPE STRING,
OBJCT TYPE STRING,
MSID1 TYPE STRING,
MSNR1 TYPE STRING,
MSID2 TYPE STRING,
MSNR2 TYPE STRING,
MSID3 TYPE STRING,
MSNR3 TYPE STRING,
DMPID TYPE STRING,
VARMS TYPE STRING,
VARNT TYPE STRING,
LFDNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATL_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_CATL_STR-LVORN sy-vline 
WA_CATL_STR-LABLN sy-vline 
WA_CATL_STR-ABLNR sy-vline 
WA_CATL_STR-ERRCD sy-vline 
WA_CATL_STR-EZEIT sy-vline 
WA_CATL_STR-REFNR sy-vline 
WA_CATL_STR-FKTC sy-vline 
WA_CATL_STR-OBJCT sy-vline 
WA_CATL_STR-MSID1 sy-vline 
WA_CATL_STR-MSNR1 sy-vline 
WA_CATL_STR-MSID2 sy-vline 
WA_CATL_STR-MSNR2 sy-vline 
WA_CATL_STR-MSID3 sy-vline 
WA_CATL_STR-MSNR3 sy-vline 
WA_CATL_STR-DMPID sy-vline 
WA_CATL_STR-VARMS sy-vline 
WA_CATL_STR-VARNT sy-vline 
WA_CATL_STR-LFDNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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