ABAP Select data from SAP table CATS_AUFNR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATS_AUFNR
*  INTO TABLE @DATA(IT_CATS_AUFNR2).
*--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_CATS_AUFNR INDEX 1 INTO DATA(WA_CATS_AUFNR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATS_AUFNR>-RAUFNR = 1.
<CATS_AUFNR>-RNPLNR = 1.
<CATS_AUFNR>-VORNR = 1.
<CATS_AUFNR>-UVORN = 1.
<CATS_AUFNR>-ARBPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATS_AUFNR-ARBID, sy-vline,
  WA_CATS_AUFNR-RAUFPL, sy-vline,
  WA_CATS_AUFNR-RAPLZL, sy-vline,
  WA_CATS_AUFNR-SKOSTL, sy-vline,
  WA_CATS_AUFNR-LSTAR, sy-vline,
  WA_CATS_AUFNR-WERKS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATS_AUFNR 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_CATS_AUFNR 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_CATS_AUFNR INTO WA_CATS_AUFNR.


*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 ALPHA, internal->external for field RAUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_AUFNR-RAUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_AUFNR-RAUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RNPLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_AUFNR-RNPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_AUFNR-RNPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_CATS_AUFNR-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_AUFNR-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field UVORN
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_CATS_AUFNR-UVORN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_AUFNR-UVORN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SKOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATS_AUFNR-SKOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATS_AUFNR-SKOSTL.
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_CATS_AUFNR_STR, 
RAUFNR TYPE STRING,
RNPLNR TYPE STRING,
VORNR TYPE STRING,
UVORN TYPE STRING,
ARBPL TYPE STRING,
ARBID TYPE STRING,
RAUFPL TYPE STRING,
RAPLZL TYPE STRING,
SKOSTL TYPE STRING,
LSTAR TYPE STRING,
WERKS TYPE STRING,
AUTYP TYPE STRING,
BEDID TYPE STRING,
STEUS TYPE STRING,
KTEXT TYPE STRING,
OBJNRH TYPE STRING,
OBJNRV TYPE STRING,
LTXA1V TYPE STRING,
LTXA1E TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATS_AUFNR_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_CATS_AUFNR_STR-RAUFNR sy-vline 
WA_CATS_AUFNR_STR-RNPLNR sy-vline 
WA_CATS_AUFNR_STR-VORNR sy-vline 
WA_CATS_AUFNR_STR-UVORN sy-vline 
WA_CATS_AUFNR_STR-ARBPL sy-vline 
WA_CATS_AUFNR_STR-ARBID sy-vline 
WA_CATS_AUFNR_STR-RAUFPL sy-vline 
WA_CATS_AUFNR_STR-RAPLZL sy-vline 
WA_CATS_AUFNR_STR-SKOSTL sy-vline 
WA_CATS_AUFNR_STR-LSTAR sy-vline 
WA_CATS_AUFNR_STR-WERKS sy-vline 
WA_CATS_AUFNR_STR-AUTYP sy-vline 
WA_CATS_AUFNR_STR-BEDID sy-vline 
WA_CATS_AUFNR_STR-STEUS sy-vline 
WA_CATS_AUFNR_STR-KTEXT sy-vline 
WA_CATS_AUFNR_STR-OBJNRH sy-vline 
WA_CATS_AUFNR_STR-OBJNRV sy-vline 
WA_CATS_AUFNR_STR-LTXA1V sy-vline 
WA_CATS_AUFNR_STR-LTXA1E sy-vline      INTO ld_text SEPARATED BY SPACE.

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