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Update documentation to reflect that standard PLs are now extensions.

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Recommend use of CREATE EXTENSION rather than plain CREATE LANGUAGE
where relevant.  Encourage PL authors to provide extension wrappers
for their PLs.
This commit is contained in:
Tom Lane
2011-03-05 01:08:38 -05:00
parent 63b656b7bf
commit c2903fb3d2
8 changed files with 52 additions and 18 deletions
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15
doc/src/sgml/ref/create_language.sgml
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@@ -37,6 +37,21 @@ CREATE [ OR REPLACE ] [ TRUSTED ] [ PROCEDURAL ] LANGUAGE <replaceable class="pa
defined in this new language.
</para>
<note>
<para>
As of <productname>PostgreSQL</productname> 9.1, most procedural
languages have been made into <quote>extensions</>, and should
therefore be installed with <xref linkend="sql-createextension">
not <command>CREATE LANGUAGE</command>. Direct use of
<command>CREATE LANGUAGE</command> should now be confined to
extension installation scripts. If you have a <quote>bare</>
language in your database, perhaps as a result of an upgrade,
you can convert it to an extension using
<literal>CREATE EXTENSION <replaceable>langname</> FROM
unpackaged</literal>.
</para>
</note>
<para>
<command>CREATE LANGUAGE</command> effectively associates the
language name with handler function(s) that are responsible for executing