ABAP Select data from SAP table CATAG_V into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATAG_V
*  INTO TABLE @DATA(IT_CATAG_V2).
*--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_CATAG_V INDEX 1 INTO DATA(WA_CATAG_V2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATAG_V>-ABLNR = 1.
<CATAG_V>-SPRAS = 1.
<CATAG_V>-ATYP = 1.
<CATAG_V>-MODEL = 1.
<CATAG_V>-APPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATAG_V-SAPPL, sy-vline,
  WA_CATAG_V-THST1, sy-vline,
  WA_CATAG_V-RVON, sy-vline,
  WA_CATAG_V-RBIS, sy-vline,
  WA_CATAG_V-FREIG, sy-vline,
  WA_CATAG_V-OSPRA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATAG_V 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_CATAG_V 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_CATAG_V INTO WA_CATAG_V.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATAG_V-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATAG_V-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field OSPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATAG_V-OSPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATAG_V-OSPRA.
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_CATAG_V_STR, 
ABLNR TYPE STRING,
SPRAS TYPE STRING,
ATYP TYPE STRING,
MODEL TYPE STRING,
APPL TYPE STRING,
SAPPL TYPE STRING,
THST1 TYPE STRING,
RVON TYPE STRING,
RBIS TYPE STRING,
FREIG TYPE STRING,
OSPRA TYPE STRING,
ERFAS TYPE STRING,
ERDAT TYPE STRING,
AENDER TYPE STRING,
AEDAT TYPE STRING,
MUSER TYPE STRING,
KATEG TYPE STRING,
NUPLA TYPE STRING,
NUANW TYPE STRING,
NULAN TYPE STRING,
NUIND TYPE STRING,
NUHOT TYPE STRING,
ABFRO TYPE STRING,
ABPLA TYPE STRING,
ABSPR TYPE STRING,
ABLAN TYPE STRING,
ABKON TYPE STRING,
KTEXT TYPE STRING,
SUCH1 TYPE STRING,
SUCH2 TYPE STRING,
SUCH3 TYPE STRING,
SUCH4 TYPE STRING,
SUCH5 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATAG_V_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_CATAG_V_STR-ABLNR sy-vline 
WA_CATAG_V_STR-SPRAS sy-vline 
WA_CATAG_V_STR-ATYP sy-vline 
WA_CATAG_V_STR-MODEL sy-vline 
WA_CATAG_V_STR-APPL sy-vline 
WA_CATAG_V_STR-SAPPL sy-vline 
WA_CATAG_V_STR-THST1 sy-vline 
WA_CATAG_V_STR-RVON sy-vline 
WA_CATAG_V_STR-RBIS sy-vline 
WA_CATAG_V_STR-FREIG sy-vline 
WA_CATAG_V_STR-OSPRA sy-vline 
WA_CATAG_V_STR-ERFAS sy-vline 
WA_CATAG_V_STR-ERDAT sy-vline 
WA_CATAG_V_STR-AENDER sy-vline 
WA_CATAG_V_STR-AEDAT sy-vline 
WA_CATAG_V_STR-MUSER sy-vline 
WA_CATAG_V_STR-KATEG sy-vline 
WA_CATAG_V_STR-NUPLA sy-vline 
WA_CATAG_V_STR-NUANW sy-vline 
WA_CATAG_V_STR-NULAN sy-vline 
WA_CATAG_V_STR-NUIND sy-vline 
WA_CATAG_V_STR-NUHOT sy-vline 
WA_CATAG_V_STR-ABFRO sy-vline 
WA_CATAG_V_STR-ABPLA sy-vline 
WA_CATAG_V_STR-ABSPR sy-vline 
WA_CATAG_V_STR-ABLAN sy-vline 
WA_CATAG_V_STR-ABKON sy-vline 
WA_CATAG_V_STR-KTEXT sy-vline 
WA_CATAG_V_STR-SUCH1 sy-vline 
WA_CATAG_V_STR-SUCH2 sy-vline 
WA_CATAG_V_STR-SUCH3 sy-vline 
WA_CATAG_V_STR-SUCH4 sy-vline 
WA_CATAG_V_STR-SUCH5 sy-vline      INTO ld_text SEPARATED BY SPACE.

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