ABAP Select data from SAP table MCEXLOG_02SCN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCEXLOG_02SCN 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_02SCN. 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_02SCN 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_02SCN TYPE STANDARD TABLE OF MCEXLOG_02SCN,
      WA_MCEXLOG_02SCN TYPE MCEXLOG_02SCN,
      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_02SCN> TYPE MCEXLOG_02SCN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCEXLOG_02SCN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCEXLOG_02SCN
  INTO TABLE IT_MCEXLOG_02SCN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEXLOG_02SCN
*  INTO TABLE @DATA(IT_MCEXLOG_02SCN2).
*--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_02SCN INDEX 1 INTO DATA(WA_MCEXLOG_02SCN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCEXLOG_02SCN ASSIGNING <MCEXLOG_02SCN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEXLOG_02SCN>-TCODE = 1.
<MCEXLOG_02SCN>-DATUM = 1.
<MCEXLOG_02SCN>-UZEIT = 1.
<MCEXLOG_02SCN>-UNAME = 1.
<MCEXLOG_02SCN>-HOST = 1.

ENDLOOP.

LOOP AT IT_MCEXLOG_02SCN INTO WA_MCEXLOG_02SCN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEXLOG_02SCN-ROCANCEL, sy-vline,
  WA_MCEXLOG_02SCN-BWVORG, sy-vline,
  WA_MCEXLOG_02SCN-EBELN, sy-vline,
  WA_MCEXLOG_02SCN-EBELP, sy-vline,
  WA_MCEXLOG_02SCN-SCLDT, sy-vline,
  WA_MCEXLOG_02SCN-SCLNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEXLOG_02SCN 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_02SCN 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_02SCN INTO WA_MCEXLOG_02SCN.


*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 EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCEXLOG_02SCN-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEXLOG_02SCN-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCEXLOG_02SCN-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEXLOG_02SCN-MEINS.
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_02SCN_STR, 
TCODE TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
UNAME TYPE STRING,
HOST TYPE STRING,
ROCANCEL TYPE STRING,
BWVORG TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
SCLDT TYPE STRING,
SCLNR TYPE STRING,
CNFDT TYPE STRING,
CNFNR TYPE STRING,
EBTYP TYPE STRING,
SCLQTY TYPE STRING,
CNFQTY TYPE STRING,
TTLQTY TYPE STRING,
MEINS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEXLOG_02SCN_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_02SCN_STR-TCODE sy-vline 
WA_MCEXLOG_02SCN_STR-DATUM sy-vline 
WA_MCEXLOG_02SCN_STR-UZEIT sy-vline 
WA_MCEXLOG_02SCN_STR-UNAME sy-vline 
WA_MCEXLOG_02SCN_STR-HOST sy-vline 
WA_MCEXLOG_02SCN_STR-ROCANCEL sy-vline 
WA_MCEXLOG_02SCN_STR-BWVORG sy-vline 
WA_MCEXLOG_02SCN_STR-EBELN sy-vline 
WA_MCEXLOG_02SCN_STR-EBELP sy-vline 
WA_MCEXLOG_02SCN_STR-SCLDT sy-vline 
WA_MCEXLOG_02SCN_STR-SCLNR sy-vline 
WA_MCEXLOG_02SCN_STR-CNFDT sy-vline 
WA_MCEXLOG_02SCN_STR-CNFNR sy-vline 
WA_MCEXLOG_02SCN_STR-EBTYP sy-vline 
WA_MCEXLOG_02SCN_STR-SCLQTY sy-vline 
WA_MCEXLOG_02SCN_STR-CNFQTY sy-vline 
WA_MCEXLOG_02SCN_STR-TTLQTY sy-vline 
WA_MCEXLOG_02SCN_STR-MEINS sy-vline      INTO ld_text SEPARATED BY SPACE.

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