ABAP Select data from SAP table LXELOGS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LXELOGS
*  INTO TABLE @DATA(IT_LXELOGS2).
*--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_LXELOGS INDEX 1 INTO DATA(WA_LXELOGS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LXELOGS>-EVENTID = 1.
<LXELOGS>-EVENTCLASSNAME = 1.
<LXELOGS>-EVENTNAME = 1.
<LXELOGS>-SEVERITY = 1.
<LXELOGS>-EVENTTIMESTAMP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LXELOGS-UNAME, sy-vline,
  WA_LXELOGS-HOSTIP, sy-vline,
  WA_LXELOGS-UHOST, sy-vline,
  WA_LXELOGS-EVENTDATA, sy-vline,
  WA_LXELOGS-SERIALIZATIONERR, sy-vline,
  WA_LXELOGS-ERRORTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LXELOGS 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_LXELOGS 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_LXELOGS INTO WA_LXELOGS.


*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 IPADD, internal->external for field HOSTIP
CALL FUNCTION 'CONVERSION_EXIT_IPADD_OUTPUT'
  EXPORTING
    input =                      WA_LXELOGS-HOSTIP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LXELOGS-HOSTIP.
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_LXELOGS_STR, 
EVENTID TYPE STRING,
EVENTCLASSNAME TYPE STRING,
EVENTNAME TYPE STRING,
SEVERITY TYPE STRING,
EVENTTIMESTAMP TYPE STRING,
UNAME TYPE STRING,
HOSTIP TYPE STRING,
UHOST TYPE STRING,
EVENTDATA TYPE STRING,
SERIALIZATIONERR TYPE STRING,
ERRORTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LXELOGS_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_LXELOGS_STR-EVENTID sy-vline 
WA_LXELOGS_STR-EVENTCLASSNAME sy-vline 
WA_LXELOGS_STR-EVENTNAME sy-vline 
WA_LXELOGS_STR-SEVERITY sy-vline 
WA_LXELOGS_STR-EVENTTIMESTAMP sy-vline 
WA_LXELOGS_STR-UNAME sy-vline 
WA_LXELOGS_STR-HOSTIP sy-vline 
WA_LXELOGS_STR-UHOST sy-vline 
WA_LXELOGS_STR-EVENTDATA sy-vline 
WA_LXELOGS_STR-SERIALIZATIONERR sy-vline 
WA_LXELOGS_STR-ERRORTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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