ABAP Select data from SAP table ALEVENT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALEVENT
*  INTO TABLE @DATA(IT_ALEVENT2).
*--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_ALEVENT INDEX 1 INTO DATA(WA_ALEVENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALEVENT>-MTSYSID = 1.
<ALEVENT>-MTMCNAME = 1.
<ALEVENT>-MTNUMRANGE = 1.
<ALEVENT>-MTUID = 1.
<ALEVENT>-MTCLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALEVENT-MTINDEX, sy-vline,
  WA_ALEVENT-EXTINDEX, sy-vline,
  WA_ALEVENT-ALSYSID, sy-vline,
  WA_ALEVENT-MSEGNAME, sy-vline,
  WA_ALEVENT-ALUNIQNUM, sy-vline,
  WA_ALEVENT-ALINDEX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALEVENT 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_ALEVENT 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_ALEVENT INTO WA_ALEVENT.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ALEVENT_STR, 
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
MTINDEX TYPE STRING,
EXTINDEX TYPE STRING,
ALSYSID TYPE STRING,
MSEGNAME TYPE STRING,
ALUNIQNUM TYPE STRING,
ALINDEX TYPE STRING,
ALERTDATE TYPE STRING,
ALERTTIME TYPE STRING,
DUMMYALIGN TYPE STRING,
EVTSYSID TYPE STRING,
EVTMSNAME TYPE STRING,
EVTUID TYPE STRING,
EVTINDEX TYPE STRING,
EVTDATE TYPE STRING,
EVTTIME TYPE STRING,
EVTDUMMY TYPE STRING,
MTECLASS TYPE STRING,
EVENTTYPE TYPE STRING,
NEWVALUE TYPE STRING,
SEVERITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALEVENT_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_ALEVENT_STR-MTSYSID sy-vline 
WA_ALEVENT_STR-MTMCNAME sy-vline 
WA_ALEVENT_STR-MTNUMRANGE sy-vline 
WA_ALEVENT_STR-MTUID sy-vline 
WA_ALEVENT_STR-MTCLASS sy-vline 
WA_ALEVENT_STR-MTINDEX sy-vline 
WA_ALEVENT_STR-EXTINDEX sy-vline 
WA_ALEVENT_STR-ALSYSID sy-vline 
WA_ALEVENT_STR-MSEGNAME sy-vline 
WA_ALEVENT_STR-ALUNIQNUM sy-vline 
WA_ALEVENT_STR-ALINDEX sy-vline 
WA_ALEVENT_STR-ALERTDATE sy-vline 
WA_ALEVENT_STR-ALERTTIME sy-vline 
WA_ALEVENT_STR-DUMMYALIGN sy-vline 
WA_ALEVENT_STR-EVTSYSID sy-vline 
WA_ALEVENT_STR-EVTMSNAME sy-vline 
WA_ALEVENT_STR-EVTUID sy-vline 
WA_ALEVENT_STR-EVTINDEX sy-vline 
WA_ALEVENT_STR-EVTDATE sy-vline 
WA_ALEVENT_STR-EVTTIME sy-vline 
WA_ALEVENT_STR-EVTDUMMY sy-vline 
WA_ALEVENT_STR-MTECLASS sy-vline 
WA_ALEVENT_STR-EVENTTYPE sy-vline 
WA_ALEVENT_STR-NEWVALUE sy-vline 
WA_ALEVENT_STR-SEVERITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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