ABAP Select data from SAP table CATSEKKO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATSEKKO
*  INTO TABLE @DATA(IT_CATSEKKO2).
*--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_CATSEKKO INDEX 1 INTO DATA(WA_CATSEKKO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATSEKKO>-MANDT = 1.
<CATSEKKO>-PERNR = 1.
<CATSEKKO>-WORKDATE = 1.
<CATSEKKO>-COUNTER = 1.
<CATSEKKO>-STOKZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATSEKKO-CATSHOURS, sy-vline,
  WA_CATSEKKO-LTXA1, sy-vline,
  WA_CATSEKKO-RKOSTL, sy-vline,
  WA_CATSEKKO-RPROJ, sy-vline,
  WA_CATSEKKO-RAUFNR, sy-vline,
  WA_CATSEKKO-RKDAUF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATSEKKO 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_CATSEKKO 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_CATSEKKO INTO WA_CATSEKKO.


*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 RKOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATSEKKO-RKOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATSEKKO-RKOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field RPROJ
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_CATSEKKO-RPROJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATSEKKO-RPROJ.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATSEKKO-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATSEKKO-LIFNR.
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_CATSEKKO_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
WORKDATE TYPE STRING,
COUNTER TYPE STRING,
STOKZ TYPE STRING,
CATSHOURS TYPE STRING,
LTXA1 TYPE STRING,
RKOSTL TYPE STRING,
RPROJ TYPE STRING,
RAUFNR TYPE STRING,
RKDAUF TYPE STRING,
RKDPOS TYPE STRING,
SEBELN TYPE STRING,
SEBELP TYPE STRING,
LSTNR TYPE STRING,
BEGUZ TYPE STRING,
ENDUZ TYPE STRING,
BELNR TYPE STRING,
TRANSFER TYPE STRING,
BUKRS TYPE STRING,
BSTYP TYPE STRING,
LIFNR TYPE STRING,
EKORG TYPE STRING,
CATSQUANTITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATSEKKO_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_CATSEKKO_STR-MANDT sy-vline 
WA_CATSEKKO_STR-PERNR sy-vline 
WA_CATSEKKO_STR-WORKDATE sy-vline 
WA_CATSEKKO_STR-COUNTER sy-vline 
WA_CATSEKKO_STR-STOKZ sy-vline 
WA_CATSEKKO_STR-CATSHOURS sy-vline 
WA_CATSEKKO_STR-LTXA1 sy-vline 
WA_CATSEKKO_STR-RKOSTL sy-vline 
WA_CATSEKKO_STR-RPROJ sy-vline 
WA_CATSEKKO_STR-RAUFNR sy-vline 
WA_CATSEKKO_STR-RKDAUF sy-vline 
WA_CATSEKKO_STR-RKDPOS sy-vline 
WA_CATSEKKO_STR-SEBELN sy-vline 
WA_CATSEKKO_STR-SEBELP sy-vline 
WA_CATSEKKO_STR-LSTNR sy-vline 
WA_CATSEKKO_STR-BEGUZ sy-vline 
WA_CATSEKKO_STR-ENDUZ sy-vline 
WA_CATSEKKO_STR-BELNR sy-vline 
WA_CATSEKKO_STR-TRANSFER sy-vline 
WA_CATSEKKO_STR-BUKRS sy-vline 
WA_CATSEKKO_STR-BSTYP sy-vline 
WA_CATSEKKO_STR-LIFNR sy-vline 
WA_CATSEKKO_STR-EKORG sy-vline 
WA_CATSEKKO_STR-CATSQUANTITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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