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><A
NAME="FUNCTIONS-EVENT-TRIGGERS"
>9.28. Event Trigger Functions</A
></H1
><P
>    Currently <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> provides one built-in event trigger
    helper function, <CODE
CLASS="FUNCTION"
>pg_event_trigger_dropped_objects</CODE
>.
   </P
><P
>    <CODE
CLASS="FUNCTION"
>pg_event_trigger_dropped_objects</CODE
> returns a list of all objects
    dropped by the command in whose <TT
CLASS="LITERAL"
>sql_drop</TT
> event it is called.
    If called in any other context,
    <CODE
CLASS="FUNCTION"
>pg_event_trigger_dropped_objects</CODE
> raises an error.
    <CODE
CLASS="FUNCTION"
>pg_event_trigger_dropped_objects</CODE
> returns the following columns:

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><TH
>Name</TH
><TH
>Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="LITERAL"
>classid</TT
></TD
><TD
><TT
CLASS="TYPE"
>Oid</TT
></TD
><TD
>OID of catalog the object belonged in</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>objid</TT
></TD
><TD
><TT
CLASS="TYPE"
>Oid</TT
></TD
><TD
>OID the object had within the catalog</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>objsubid</TT
></TD
><TD
><TT
CLASS="TYPE"
>int32</TT
></TD
><TD
>Object sub-id (e.g. attribute number for columns)</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>object_type</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
>Type of the object</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>schema_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
>         Name of the schema the object belonged in, if any; otherwise <TT
CLASS="LITERAL"
>NULL</TT
>.
         No quoting is applied.
        </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>object_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
>         Name of the object, if the combination of schema and name can be
         used as a unique identifier for the object; otherwise <TT
CLASS="LITERAL"
>NULL</TT
>.
         No quoting is applied, and name is never schema-qualified.
        </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>object_identity</TT
></TD
><TD
><TT
CLASS="TYPE"
>text</TT
></TD
><TD
>         Text rendering of the object identity, schema-qualified. Each and every
         identifier present in the identity is quoted if necessary.
        </TD
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><P
></P
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>
   </P
><P
>    The <CODE
CLASS="FUNCTION"
>pg_event_trigger_dropped_objects</CODE
> function can be used
    in an event trigger like this:
</P><PRE
CLASS="PROGRAMLISTING"
>CREATE FUNCTION test_event_trigger_for_drops()
        RETURNS event_trigger LANGUAGE plpgsql AS $$
DECLARE
    obj record;
BEGIN
    FOR obj IN SELECT * FROM pg_event_trigger_dropped_objects()
    LOOP
        RAISE NOTICE '% dropped object: % %.% %',
                     tg_tag,
                     obj.object_type,
                     obj.schema_name,
                     obj.object_name,
                     obj.object_identity;
    END LOOP;
END
$$;
CREATE EVENT TRIGGER test_event_trigger_for_drops
   ON sql_drop
   EXECUTE PROCEDURE test_event_trigger_for_drops();</PRE
><P>
    </P
><P
>       For more information about event triggers,
       see <A
HREF="event-triggers.html"
>Chapter 37</A
>.
    </P
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