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postgresql8.3-docs-8.3.6-2mdv2008.1.x86_64.rpm

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><H1
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><A
NAME="INFOSCHEMA-TRIGGERS"
>33.42. <TT
CLASS="LITERAL"
>triggers</TT
></A
></H1
><P
>   The view <TT
CLASS="LITERAL"
>triggers</TT
> contains all triggers defined
   in the current database on tables that the current user owns or has
   some privilege on.
  </P
><DIV
CLASS="TABLE"
><A
NAME="AEN39593"
></A
><P
><B
>Table 33-40. <TT
CLASS="LITERAL"
>triggers</TT
> Columns</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><COL><THEAD
><TR
><TH
>Name</TH
><TH
>Data Type</TH
><TH
>Description</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="LITERAL"
>trigger_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the database that contains the trigger (always the current database)</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>trigger_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the schema that contains the trigger</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>trigger_name</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the trigger</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>event_manipulation</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>       Event that fires the trigger (<TT
CLASS="LITERAL"
>INSERT</TT
>,
       <TT
CLASS="LITERAL"
>UPDATE</TT
>, or <TT
CLASS="LITERAL"
>DELETE</TT
>)
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>event_object_catalog</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>       Name of the database that contains the table that the trigger
       is defined on (always the current database)
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>event_object_schema</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the schema that contains the table that the trigger is defined on</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>event_object_table</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Name of the table that the trigger is defined on</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>action_order</TT
></TD
><TD
><TT
CLASS="TYPE"
>cardinal_number</TT
></TD
><TD
>Not yet implemented</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>action_condition</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>action_statement</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>       Statement that is executed by the trigger (currently always
       <TT
CLASS="LITERAL"
>EXECUTE PROCEDURE
       <TT
CLASS="REPLACEABLE"
><I
>function</I
></TT
>(...)</TT
>)
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>action_orientation</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>       Identifies whether the trigger fires once for each processed
       row or once for each statement (<TT
CLASS="LITERAL"
>ROW</TT
> or
       <TT
CLASS="LITERAL"
>STATEMENT</TT
>)
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>condition_timing</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
>       Time at which the trigger fires (<TT
CLASS="LITERAL"
>BEFORE</TT
> or
       <TT
CLASS="LITERAL"
>AFTER</TT
>)
      </TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>condition_reference_old_table</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>condition_reference_new_table</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>condition_reference_old_row</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>condition_reference_new_row</TT
></TD
><TD
><TT
CLASS="TYPE"
>sql_identifier</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>created</TT
></TD
><TD
><TT
CLASS="TYPE"
>time_stamp</TT
></TD
><TD
>Applies to a feature not available in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></TD
></TR
></TBODY
></TABLE
></DIV
><P
>   Triggers in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> have two
   incompatibilities with the SQL standard that affect the
   representation in the information schema.  First, trigger names are
   local to the table in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>, rather
   than being independent schema objects.  Therefore there can be duplicate
   trigger names defined in one schema, as long as they belong to
   different tables.  (<TT
CLASS="LITERAL"
>trigger_catalog</TT
> and
   <TT
CLASS="LITERAL"
>trigger_schema</TT
> are really the values pertaining
   to the table that the trigger is defined on.)  Second, triggers can
   be defined to fire on multiple events in
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> (e.g., <TT
CLASS="LITERAL"
>ON INSERT OR
   UPDATE</TT
>), whereas the SQL standard only allows one.  If a
   trigger is defined to fire on multiple events, it is represented as
   multiple rows in the information schema, one for each type of
   event.  As a consequence of these two issues, the primary key of
   the view <TT
CLASS="LITERAL"
>triggers</TT
> is really
   <TT
CLASS="LITERAL"
>(trigger_catalog, trigger_schema, trigger_name,
   event_object_table, event_manipulation)</TT
> instead of
   <TT
CLASS="LITERAL"
>(trigger_catalog, trigger_schema, trigger_name)</TT
>,
   which is what the SQL standard specifies.  Nonetheless, if you
   define your triggers in a manner that conforms with the SQL
   standard (trigger names unique in the schema and only one event
   type per trigger), this will not affect you.
  </P
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