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Add pg_typeof() function.

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Brendan Jurd
This commit is contained in:
Tom Lane
2008-11-03 17:51:13 +00:00
parent 06c22d7f51
commit b8fab2411d
7 changed files with 100 additions and 7 deletions
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17
doc/src/sgml/func.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.451 2008/10/27 09:37:46 petere Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.452 2008/11/03 17:51:12 tgl Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -11643,6 +11643,10 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<primary>pg_tablespace_databases</primary>
</indexterm>
<indexterm>
<primary>pg_typeof</primary>
</indexterm>
<para>
<xref linkend="functions-info-catalog-table"> lists functions that
extract information from the system catalogs.
@ -11766,6 +11770,11 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<entry><type>setof oid</type></entry>
<entry>get the set of database OIDs that have objects in the tablespace</entry>
</row>
<row>
<entry><literal><function>pg_typeof</function>(<parameter>any</parameter>)</literal></entry>
<entry><type>regtype</type></entry>
<entry>get the data type of any value</entry>
</row>
</tbody>
</tgroup>
</table>
@ -11848,6 +11857,12 @@ SELECT pg_type_is_visible('myschema.widget'::regtype);
<structname>pg_class</> catalogs.
</para>
<para>
<function>pg_typeof</function> returns the OID of the data type of the
value that is passed to it. This can be helpful for troubleshooting or
dynamically constructing SQL queries.
</para>
<indexterm>
<primary>col_description</primary>
</indexterm>