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<!-- doc/src/sgml/external-projects.sgml -->
<appendix id="external-projects">
<title>External Projects</title>
<para>
<productname>PostgreSQL</productname> is a complex software project,
and managing the project is difficult. We have found that many
enhancements to <productname>PostgreSQL</productname> can be more
efficiently developed separately from the core project.
</para>
<sect1 id="external-interfaces">
<title>Client Interfaces</title>
<indexterm>
<primary>interfaces</primary>
<secondary>externally maintained</secondary>
</indexterm>
<para>
There are only two client interfaces included in the base
<productname>PostgreSQL</productname> distribution:
<itemizedlist>
<listitem>
<para>
<link linkend="libpq">libpq</link> is included because it is the
primary C language interface, and because many other client interfaces
are built on top of it.
</para>
</listitem>
<listitem>
<para>
<link linkend="ecpg">ECPG</link> is included because it depends on the
server-side SQL grammar, and is therefore sensitive to changes in
<productname>PostgreSQL</productname> itself.
</para>
</listitem>
</itemizedlist>
All other language interfaces are external projects and are distributed
separately. <xref linkend="language-interface-table"/> includes a list of
some of these projects. Note that some of these packages might not be
released under the same license as <productname>PostgreSQL</productname>. For more
information on each language interface, including licensing terms, refer to
its website and documentation.
</para>
<table id="language-interface-table">
<title>Externally Maintained Client Interfaces</title>
<tgroup cols="4">
<thead>
<row>
<entry>Name</entry>
<entry>Language</entry>
<entry>Comments</entry>
<entry>Website</entry>
</row>
</thead>
<tbody>
<row>
<entry>DBD::Pg</entry>
<entry>Perl</entry>
<entry>Perl DBI driver</entry>
<entry><ulink url="https://metacpan.org/release/DBD-Pg"></ulink></entry>
</row>
<row>
<entry>JDBC</entry>
<entry>Java</entry>
<entry>Type 4 JDBC driver</entry>
<entry><ulink url="https://jdbc.postgresql.org/"></ulink></entry>
</row>
<row>
<entry>libpqxx</entry>
<entry>C++</entry>
<entry>C++ interface</entry>
<entry><ulink url="http://pqxx.org/"></ulink></entry>
</row>
<row>
<entry>node-postgres</entry>
<entry>JavaScript</entry>
<entry>Node.js driver</entry>
<entry><ulink url="https://node-postgres.com/"></ulink></entry>
</row>
<row>
<entry>Npgsql</entry>
<entry>.NET</entry>
<entry>.NET data provider</entry>
<entry><ulink url="http://www.npgsql.org/"></ulink></entry>
</row>
<row>
<entry>pgtcl</entry>
<entry>Tcl</entry>
<entry></entry>
<entry><ulink url="https://github.com/flightaware/Pgtcl"></ulink></entry>
</row>
<row>
<entry>pgtclng</entry>
<entry>Tcl</entry>
<entry></entry>
<entry><ulink url="https://sourceforge.net/projects/pgtclng/"></ulink></entry>
</row>
<row>
<entry>pq</entry>
<entry>Go</entry>
<entry>Pure Go driver for Go's database/sql</entry>
<entry><ulink url="https://github.com/lib/pq"></ulink></entry>
</row>
<row>
<entry>psqlODBC</entry>
<entry>ODBC</entry>
<entry>ODBC driver</entry>
<entry><ulink url="https://odbc.postgresql.org/"></ulink></entry>
</row>
<row>
<entry>psycopg</entry>
<entry>Python</entry>
<entry>DB API 2.0-compliant</entry>
<entry><ulink url="http://initd.org/psycopg/"></ulink></entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="external-admin-tools">
<title>Administration Tools</title>
<indexterm>
<primary>administration tools</primary>
<secondary>externally maintained</secondary>
</indexterm>
<para>
There are several administration tools available for
<productname>PostgreSQL</productname>. The most popular is
<application><ulink url="https://www.pgadmin.org/">pgAdmin</ulink></application>,
and there are several commercially available ones as well.
</para>
</sect1>
<sect1 id="external-pl">
<title>Procedural Languages</title>
<indexterm>
<primary>procedural language</primary>
<secondary>externally maintained</secondary>
</indexterm>
<para>
<productname>PostgreSQL</productname> includes several procedural
languages with the base distribution: <link
linkend="plpgsql">PL/pgSQL</link>, <link linkend="pltcl">PL/Tcl</link>,
<link linkend="plperl">PL/Perl</link>, and <link
linkend="plpython">PL/Python</link>.
</para>
<para>
In addition, there are a number of procedural languages that are developed
and maintained outside the core <productname>PostgreSQL</productname>
distribution. <xref linkend="pl-language-table"/> lists some of these
packages. Note that some of these projects might not be released under the same
license as <productname>PostgreSQL</productname>. For more information on each
procedural language, including licensing information, refer to its website
and documentation.
</para>
<table id="pl-language-table">
<title>Externally Maintained Procedural Languages</title>
<tgroup cols="3">
<thead>
<row>
<entry>Name</entry>
<entry>Language</entry>
<entry>Website</entry>
</row>
</thead>
<tbody>
<row>
<entry>PL/Java</entry>
<entry>Java</entry>
<entry><ulink url="https://tada.github.io/pljava/"></ulink></entry>
</row>
<row>
<entry>PL/Lua</entry>
<entry>Lua</entry>
<entry><ulink url="https://github.com/pllua/pllua"></ulink></entry>
</row>
<row>
<entry>PL/R</entry>
<entry>R</entry>
<entry><ulink url="https://github.com/postgres-plr/plr"></ulink></entry>
</row>
<row>
<entry>PL/sh</entry>
<entry>Unix shell</entry>
<entry><ulink url="https://github.com/petere/plsh"></ulink></entry>
</row>
<row>
<entry>PL/v8</entry>
<entry>JavaScript</entry>
<entry><ulink url="https://github.com/plv8/plv8"></ulink></entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 id="external-extensions">
<title>Extensions</title>
<indexterm>
<primary>extension</primary>
<secondary>externally maintained</secondary>
</indexterm>
<para>
<productname>PostgreSQL</productname> is designed to be easily extensible. For
this reason, extensions loaded into the database can function
just like features that are built in. The
<filename>contrib/</filename> directory shipped with the source code
contains several extensions, which are described in
<xref linkend="contrib"/>. Other extensions are developed
independently, like <application><ulink
url="http://postgis.net/">PostGIS</ulink></application>. Even
<productname>PostgreSQL</productname> replication solutions can be developed
externally. For example, <application> <ulink
url="http://www.slony.info">Slony-I</ulink></application> is a popular
primary/standby replication solution that is developed independently
from the core project.
</para>
</sect1>
</appendix>
|
