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Add information_schema.triggered_update_columns

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This reflects the recently added support for triggers on columns.
This commit is contained in:
Peter Eisentraut 2009-12-31 14:41:23 +00:00
parent 31cf893088
commit c584d11bb3
2 changed files with 96 additions and 8 deletions
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76
doc/src/sgml/information_schema.sgml
View file

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/information_schema.sgml,v 1.43 2009/12/30 22:48:10 petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/information_schema.sgml,v 1.44 2009/12/31 14:41:23 petere Exp $ -->
<chapter id="information-schema">
<title>The Information Schema</title>
@ -4796,6 +4796,80 @@ ORDER BY c.ordinal_position;
</table>
</sect1>
<sect1 id="infoschema-triggered-update-columns">
<title><literal>triggered_update_columns</literal></title>
<para>
For triggers in the current database that specify a column list
(like <literal>UPDATE OF column1, column2</literal>), the
view <literal>triggered_update_columns</literal> identifies these
columns. Triggers that do not specify a column list are not
included in this view. Only those columns are shown that the
current user owns or has some non-SELECT privilege on.
</para>
<table>
<title><literal>triggered_update_columns</literal> Columns</title>
<tgroup cols="3">
<thead>
<row>
<entry>Name</entry>
<entry>Data Type</entry>
<entry>Description</entry>
</row>
</thead>
<tbody>
<row>
<entry><literal>trigger_catalog</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>Name of the database that contains the trigger (always the current database)</entry>
</row>
<row>
<entry><literal>trigger_schema</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>Name of the schema that contains the trigger</entry>
</row>
<row>
<entry><literal>trigger_name</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>Name of the trigger</entry>
</row>
<row>
<entry><literal>event_object_catalog</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>
Name of the database that contains the table that the trigger
is defined on (always the current database)
</entry>
</row>
<row>
<entry><literal>event_object_schema</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>Name of the schema that contains the table that the trigger is defined on</entry>
</row>
<row>
<entry><literal>event_object_table</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>Name of the table that the trigger is defined on</entry>
</row>
<row>
<entry><literal>event_object_column</literal></entry>
<entry><type>sql_identifier</type></entry>
<entry>Name of the column that the trigger is defined on</entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="infoschema-triggers">
<title><literal>triggers</literal></title>

28
src/backend/catalog/information_schema.sql
View file

@ -4,7 +4,7 @@
*
* Copyright (c) 2003-2009, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.61 2009/12/30 22:48:10 petere Exp $
* $PostgreSQL: pgsql/src/backend/catalog/information_schema.sql,v 1.62 2009/12/31 14:41:23 petere Exp $
*/
/*
@ -1852,13 +1852,27 @@ GRANT SELECT ON tables TO PUBLIC;
CREATE VIEW triggered_update_columns AS
SELECT CAST(current_database() AS sql_identifier) AS trigger_catalog,
CAST(null AS sql_identifier) AS trigger_schema,
CAST(null AS sql_identifier) AS trigger_name,
CAST(n.nspname AS sql_identifier) AS trigger_schema,
CAST(t.tgname AS sql_identifier) AS trigger_name,
CAST(current_database() AS sql_identifier) AS event_object_catalog,
CAST(null AS sql_identifier) AS event_object_schema,
CAST(null AS sql_identifier) AS event_object_table,
CAST(null AS sql_identifier) AS event_object_column
WHERE false;
CAST(n.nspname AS sql_identifier) AS event_object_schema,
CAST(c.relname AS sql_identifier) AS event_object_table,
CAST(a.attname AS sql_identifier) AS event_object_column
FROM pg_namespace n, pg_class c, pg_trigger t,
(SELECT tgoid, (ta0.tgat).x AS tgattnum, (ta0.tgat).n AS tgattpos
FROM (SELECT oid AS tgoid, information_schema._pg_expandarray(tgattr) AS tgat FROM pg_trigger) AS ta0) AS ta,
pg_attribute a
WHERE n.oid = c.relnamespace
AND c.oid = t.tgrelid
AND t.oid = ta.tgoid
AND (a.attrelid, a.attnum) = (t.tgrelid, ta.tgattnum)
AND NOT t.tgisconstraint
AND (NOT pg_is_other_temp_schema(n.oid))
AND (pg_has_role(c.relowner, 'USAGE')
-- SELECT privilege omitted, per SQL standard
OR has_column_privilege(c.oid, a.attnum, 'INSERT, UPDATE, REFERENCES') );
GRANT SELECT ON triggered_update_columns TO PUBLIC;