ABAP Select data from SAP table CATP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATP
*  INTO TABLE @DATA(IT_CATP2).
*--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_CATP INDEX 1 INTO DATA(WA_CATP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATP>-ABLNR = 1.
<CATP>-VARID = 1.
<CATP>-REFNR = 1.
<CATP>-PARNA = 1.
<CATP>-PATYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATP-PDTEL, sy-vline,
  WA_CATP-PDOMA, sy-vline,
  WA_CATP-PDTYP, sy-vline,
  WA_CATP-PITYP, sy-vline,
  WA_CATP-PDLEN, sy-vline,
  WA_CATP-PILEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATP 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_CATP 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_CATP INTO WA_CATP.


*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 PDTYP
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_CATP-PDTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATP-PDTYP.
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_CATP_STR, 
ABLNR TYPE STRING,
VARID TYPE STRING,
REFNR TYPE STRING,
PARNA TYPE STRING,
PATYP TYPE STRING,
PDTEL TYPE STRING,
PDOMA TYPE STRING,
PDTYP TYPE STRING,
PITYP TYPE STRING,
PDLEN TYPE STRING,
PILEN TYPE STRING,
PLOWC TYPE STRING,
PAFLD TYPE STRING,
PAVAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATP_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_CATP_STR-ABLNR sy-vline 
WA_CATP_STR-VARID sy-vline 
WA_CATP_STR-REFNR sy-vline 
WA_CATP_STR-PARNA sy-vline 
WA_CATP_STR-PATYP sy-vline 
WA_CATP_STR-PDTEL sy-vline 
WA_CATP_STR-PDOMA sy-vline 
WA_CATP_STR-PDTYP sy-vline 
WA_CATP_STR-PITYP sy-vline 
WA_CATP_STR-PDLEN sy-vline 
WA_CATP_STR-PILEN sy-vline 
WA_CATP_STR-PLOWC sy-vline 
WA_CATP_STR-PAFLD sy-vline 
WA_CATP_STR-PAVAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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