ABAP Select data from SAP table MCEXLOG_04PKKAN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCEXLOG_04PKKAN 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 MCEXLOG_04PKKAN. 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 MCEXLOG_04PKKAN 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_MCEXLOG_04PKKAN TYPE STANDARD TABLE OF MCEXLOG_04PKKAN,
      WA_MCEXLOG_04PKKAN TYPE MCEXLOG_04PKKAN,
      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: <MCEXLOG_04PKKAN> TYPE MCEXLOG_04PKKAN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCEXLOG_04PKKAN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCEXLOG_04PKKAN
  INTO TABLE IT_MCEXLOG_04PKKAN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEXLOG_04PKKAN
*  INTO TABLE @DATA(IT_MCEXLOG_04PKKAN2).
*--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_MCEXLOG_04PKKAN INDEX 1 INTO DATA(WA_MCEXLOG_04PKKAN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCEXLOG_04PKKAN ASSIGNING <MCEXLOG_04PKKAN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEXLOG_04PKKAN>-TCODE = 1.
<MCEXLOG_04PKKAN>-DATUM = 1.
<MCEXLOG_04PKKAN>-UZEIT = 1.
<MCEXLOG_04PKKAN>-UNAME = 1.
<MCEXLOG_04PKKAN>-HOST = 1.

ENDLOOP.

LOOP AT IT_MCEXLOG_04PKKAN INTO WA_MCEXLOG_04PKKAN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEXLOG_04PKKAN-ROCANCEL, sy-vline,
  WA_MCEXLOG_04PKKAN-PKNUM, sy-vline,
  WA_MCEXLOG_04PKKAN-SAEDT, sy-vline,
  WA_MCEXLOG_04PKKAN-SAEUZ, sy-vline,
  WA_MCEXLOG_04PKKAN-WERKS, sy-vline,
  WA_MCEXLOG_04PKKAN-PRVBE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEXLOG_04PKKAN 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_MCEXLOG_04PKKAN 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_MCEXLOG_04PKKAN INTO WA_MCEXLOG_04PKKAN.


*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 PKNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCEXLOG_04PKKAN-PKNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEXLOG_04PKKAN-PKNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCEXLOG_04PKKAN-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEXLOG_04PKKAN-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCEXLOG_04PKKAN-LFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEXLOG_04PKKAN-LFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BAMME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCEXLOG_04PKKAN-BAMME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEXLOG_04PKKAN-BAMME.
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_MCEXLOG_04PKKAN_STR, 
TCODE TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
UNAME TYPE STRING,
HOST TYPE STRING,
ROCANCEL TYPE STRING,
PKNUM TYPE STRING,
SAEDT TYPE STRING,
SAEUZ TYPE STRING,
WERKS TYPE STRING,
PRVBE TYPE STRING,
MATNR TYPE STRING,
LGORT TYPE STRING,
LFNR TYPE STRING,
PROCMD TYPE STRING,
REPSTE TYPE STRING,
REPSTI TYPE STRING,
REPSTS TYPE STRING,
RGVRQ TYPE STRING,
RGVRV TYPE STRING,
SIGAZ TYPE STRING,
SSLOC TYPE STRING,
ACRTD TYPE STRING,
ACRTH TYPE STRING,
AIPTD TYPE STRING,
AIPTH TYPE STRING,
ARFTD TYPE STRING,
ARFTH TYPE STRING,
ARLTD TYPE STRING,
ARLTH TYPE STRING,
AWTTD TYPE STRING,
AWTTH TYPE STRING,
BAMME TYPE STRING,
BEHAZ TYPE STRING,
EMTYBX TYPE STRING,
ERRNM TYPE STRING,
FULLBX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEXLOG_04PKKAN_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_MCEXLOG_04PKKAN_STR-TCODE sy-vline 
WA_MCEXLOG_04PKKAN_STR-DATUM sy-vline 
WA_MCEXLOG_04PKKAN_STR-UZEIT sy-vline 
WA_MCEXLOG_04PKKAN_STR-UNAME sy-vline 
WA_MCEXLOG_04PKKAN_STR-HOST sy-vline 
WA_MCEXLOG_04PKKAN_STR-ROCANCEL sy-vline 
WA_MCEXLOG_04PKKAN_STR-PKNUM sy-vline 
WA_MCEXLOG_04PKKAN_STR-SAEDT sy-vline 
WA_MCEXLOG_04PKKAN_STR-SAEUZ sy-vline 
WA_MCEXLOG_04PKKAN_STR-WERKS sy-vline 
WA_MCEXLOG_04PKKAN_STR-PRVBE sy-vline 
WA_MCEXLOG_04PKKAN_STR-MATNR sy-vline 
WA_MCEXLOG_04PKKAN_STR-LGORT sy-vline 
WA_MCEXLOG_04PKKAN_STR-LFNR sy-vline 
WA_MCEXLOG_04PKKAN_STR-PROCMD sy-vline 
WA_MCEXLOG_04PKKAN_STR-REPSTE sy-vline 
WA_MCEXLOG_04PKKAN_STR-REPSTI sy-vline 
WA_MCEXLOG_04PKKAN_STR-REPSTS sy-vline 
WA_MCEXLOG_04PKKAN_STR-RGVRQ sy-vline 
WA_MCEXLOG_04PKKAN_STR-RGVRV sy-vline 
WA_MCEXLOG_04PKKAN_STR-SIGAZ sy-vline 
WA_MCEXLOG_04PKKAN_STR-SSLOC sy-vline 
WA_MCEXLOG_04PKKAN_STR-ACRTD sy-vline 
WA_MCEXLOG_04PKKAN_STR-ACRTH sy-vline 
WA_MCEXLOG_04PKKAN_STR-AIPTD sy-vline 
WA_MCEXLOG_04PKKAN_STR-AIPTH sy-vline 
WA_MCEXLOG_04PKKAN_STR-ARFTD sy-vline 
WA_MCEXLOG_04PKKAN_STR-ARFTH sy-vline 
WA_MCEXLOG_04PKKAN_STR-ARLTD sy-vline 
WA_MCEXLOG_04PKKAN_STR-ARLTH sy-vline 
WA_MCEXLOG_04PKKAN_STR-AWTTD sy-vline 
WA_MCEXLOG_04PKKAN_STR-AWTTH sy-vline 
WA_MCEXLOG_04PKKAN_STR-BAMME sy-vline 
WA_MCEXLOG_04PKKAN_STR-BEHAZ sy-vline 
WA_MCEXLOG_04PKKAN_STR-EMTYBX sy-vline 
WA_MCEXLOG_04PKKAN_STR-ERRNM sy-vline 
WA_MCEXLOG_04PKKAN_STR-FULLBX sy-vline      INTO ld_text SEPARATED BY SPACE.

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