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><H1
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><A
NAME="INFOSCHEMA-TRIGGERS"
>34.54. <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 and views that the current user owns
or has some privilege other than <TT
CLASS="LITERAL"
>SELECT</TT
> on.
</P
><DIV
CLASS="TABLE"
><A
NAME="AEN51266"
></A
><P
><B
>Table 34-52. <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
> <TT
CLASS="LITERAL"
>WHEN</TT
> condition of the trigger, null if none
(also null if the table is not owned by a currently enabled
role)
</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"
>action_timing</TT
></TD
><TD
><TT
CLASS="TYPE"
>character_data</TT
></TD
><TD
> Time at which the trigger fires (<TT
CLASS="LITERAL"
>BEFORE</TT
>,
<TT
CLASS="LITERAL"
>AFTER</TT
>, or <TT
CLASS="LITERAL"
>INSTEAD OF</TT
>)
</TD
></TR
><TR
><TD
><TT
CLASS="LITERAL"
>action_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"
>action_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"
>action_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"
>action_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 each table in <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>, rather
than being independent schema objects. Therefore there can be duplicate
trigger names defined in one schema, so 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, event_object_table,
trigger_name, 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
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
> Prior to <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 9.1, this view's columns
<TT
CLASS="STRUCTFIELD"
>action_timing</TT
>,
<TT
CLASS="STRUCTFIELD"
>action_reference_old_table</TT
>,
<TT
CLASS="STRUCTFIELD"
>action_reference_new_table</TT
>,
<TT
CLASS="STRUCTFIELD"
>action_reference_old_row</TT
>, and
<TT
CLASS="STRUCTFIELD"
>action_reference_new_row</TT
>
were named
<TT
CLASS="STRUCTFIELD"
>condition_timing</TT
>,
<TT
CLASS="STRUCTFIELD"
>condition_reference_old_table</TT
>,
<TT
CLASS="STRUCTFIELD"
>condition_reference_new_table</TT
>,
<TT
CLASS="STRUCTFIELD"
>condition_reference_old_row</TT
>, and
<TT
CLASS="STRUCTFIELD"
>condition_reference_new_row</TT
>
respectively.
That was how they were named in the SQL:1999 standard.
The new naming conforms to SQL:2003 and later.
</P
></BLOCKQUOTE
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