ABAP Select data from SAP table CATK into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CATK 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 CATK. 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 CATK 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_CATK TYPE STANDARD TABLE OF CATK,
      WA_CATK TYPE CATK,
      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: <CATK> TYPE CATK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATK
*  INTO TABLE @DATA(IT_CATK2).
*--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_CATK INDEX 1 INTO DATA(WA_CATK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATK>-LVORN = 1.
<CATK>-VORGA = 1.
<CATK>-SDAT = 1.
<CATK>-SUHR = 1.
<CATK>-VDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATK-SNAME, sy-vline,
  WA_CATK-SYSTEM, sy-vline,
  WA_CATK-MAND, sy-vline,
  WA_CATK-ASPRA, sy-vline,
  WA_CATK-CPROG, sy-vline,
  WA_CATK-ANZABL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATK 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_CATK 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_CATK INTO WA_CATK.


*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 ASPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATK-ASPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATK-ASPRA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field R2ASPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATK-R2ASPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATK-R2ASPRA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field R3ASPRA
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATK-R3ASPRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATK-R3ASPRA.
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_CATK_STR, 
LVORN TYPE STRING,
VORGA TYPE STRING,
SDAT TYPE STRING,
SUHR TYPE STRING,
VDAT TYPE STRING,
SNAME TYPE STRING,
SYSTEM TYPE STRING,
MAND TYPE STRING,
ASPRA TYPE STRING,
CPROG TYPE STRING,
ANZABL TYPE STRING,
ANZPOS TYPE STRING,
ANZERR TYPE STRING,
ANZINA TYPE STRING,
BISABL TYPE STRING,
KTEXT TYPE STRING,
SAPRL TYPE STRING,
HOST TYPE STRING,
OPSYS TYPE STRING,
DBSYS TYPE STRING,
RFCDEST TYPE STRING,
RF2DEST TYPE STRING,
ARCH TYPE STRING,
R2SYSTEM TYPE STRING,
R2MAND TYPE STRING,
R2ASPRA TYPE STRING,
R2SNAME TYPE STRING,
R2HOST TYPE STRING,
R2OPSYS TYPE STRING,
R2DBSYS TYPE STRING,
R3SYSTEM TYPE STRING,
R3MAND TYPE STRING,
R3ASPRA TYPE STRING,
R3SNAME TYPE STRING,
R3HOST TYPE STRING,
R3OPSYS TYPE STRING,
R3DBSYS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATK_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_CATK_STR-LVORN sy-vline 
WA_CATK_STR-VORGA sy-vline 
WA_CATK_STR-SDAT sy-vline 
WA_CATK_STR-SUHR sy-vline 
WA_CATK_STR-VDAT sy-vline 
WA_CATK_STR-SNAME sy-vline 
WA_CATK_STR-SYSTEM sy-vline 
WA_CATK_STR-MAND sy-vline 
WA_CATK_STR-ASPRA sy-vline 
WA_CATK_STR-CPROG sy-vline 
WA_CATK_STR-ANZABL sy-vline 
WA_CATK_STR-ANZPOS sy-vline 
WA_CATK_STR-ANZERR sy-vline 
WA_CATK_STR-ANZINA sy-vline 
WA_CATK_STR-BISABL sy-vline 
WA_CATK_STR-KTEXT sy-vline 
WA_CATK_STR-SAPRL sy-vline 
WA_CATK_STR-HOST sy-vline 
WA_CATK_STR-OPSYS sy-vline 
WA_CATK_STR-DBSYS sy-vline 
WA_CATK_STR-RFCDEST sy-vline 
WA_CATK_STR-RF2DEST sy-vline 
WA_CATK_STR-ARCH sy-vline 
WA_CATK_STR-R2SYSTEM sy-vline 
WA_CATK_STR-R2MAND sy-vline 
WA_CATK_STR-R2ASPRA sy-vline 
WA_CATK_STR-R2SNAME sy-vline 
WA_CATK_STR-R2HOST sy-vline 
WA_CATK_STR-R2OPSYS sy-vline 
WA_CATK_STR-R2DBSYS sy-vline 
WA_CATK_STR-R3SYSTEM sy-vline 
WA_CATK_STR-R3MAND sy-vline 
WA_CATK_STR-R3ASPRA sy-vline 
WA_CATK_STR-R3SNAME sy-vline 
WA_CATK_STR-R3HOST sy-vline 
WA_CATK_STR-R3OPSYS sy-vline 
WA_CATK_STR-R3DBSYS sy-vline      INTO ld_text SEPARATED BY SPACE.

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