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<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/droplang.sgml,v 1.27 2006/09/16 00:30:18 momjian Exp $
PostgreSQL documentation
-->
<refentry id="APP-DROPLANG">
<refmeta>
<refentrytitle id="APP-DROPLANG-TITLE"><application>droplang</application></refentrytitle>
<manvolnum>1</manvolnum>
<refmiscinfo>Application</refmiscinfo>
</refmeta>
<refnamediv>
<refname>droplang</refname>
<refpurpose>remove a <productname>PostgreSQL</productname> procedural language</refpurpose>
</refnamediv>
<indexterm zone="app-droplang">
<primary>droplang</primary>
</indexterm>
<refsynopsisdiv>
<cmdsynopsis>
<command>droplang</command>
<arg rep="repeat"><replaceable>connection-option</replaceable></arg>
<arg choice="plain"><replaceable>langname</replaceable></arg>
<arg><replaceable>dbname</replaceable></arg>
<sbr>
<command>droplang</command>
<arg rep="repeat"><replaceable>connection-option</replaceable></arg>
<group choice="plain"><arg>--list</arg><arg>-l</arg></group>
<arg choice="plain"><replaceable>dbname</replaceable></arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="R1-APP-DROPLANG-1">
<title>
Description
</title>
<para>
<application>droplang</application> is a utility for removing an
existing programming language from a
<productname>PostgreSQL</productname> database.
<application>droplang</application> can drop any procedural language,
even those not supplied by the <productname>PostgreSQL</> distribution.
</para>
<para>
Although backend programming languages can be removed directly using
several <acronym>SQL</acronym> commands, it is recommended to use
<application>droplang</application> because it performs a number
of checks and is much easier to use. See
<xref linkend="sql-droplanguage" endterm="sql-droplanguage-title">
for more.
</para>
</refsect1>
<refsect1>
<title>Options</title>
<para>
<application>droplang</application> accepts the following command line arguments:
<variablelist>
<varlistentry>
<term><replaceable class="parameter">langname</replaceable></term>
<listitem>
<para>
Specifies the name of the backend programming language to be removed.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option><optional>-d</> <replaceable class="parameter">dbname</replaceable></></term>
<term><option><optional>--dbname</> <replaceable class="parameter">dbname</replaceable></></term>
<listitem>
<para>
Specifies from which database the language should be removed.
The default is to use the database with the same name as the
current system user.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-e</></term>
<term><option>--echo</></term>
<listitem>
<para>
Display SQL commands as they are executed.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-l</></term>
<term><option>--list</></term>
<listitem>
<para>
Show a list of already installed languages in the target database.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
<para>
<application>droplang</application> also accepts
the following command line arguments for connection parameters:
<variablelist>
<varlistentry>
<term><option>-h <replaceable class="parameter">host</replaceable></></term>
<term><option>--host <replaceable class="parameter">host</replaceable></></term>
<listitem>
<para>
Specifies the host name of the machine on which the
server
is running. If host begins with a slash, it is used
as the directory for the Unix domain socket.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-p <replaceable class="parameter">port</replaceable></></term>
<term><option>--port <replaceable class="parameter">port</replaceable></></term>
<listitem>
<para>
Specifies the Internet TCP/IP port or local Unix domain socket file
extension on which the server
is listening for connections.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-U <replaceable class="parameter">username</replaceable></></term>
<term><option>--username <replaceable class="parameter">username</replaceable></></term>
<listitem>
<para>
User name to connect as
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>-W</></term>
<term><option>--password</></term>
<listitem>
<para>
Force password prompt.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1>
<title>Environment</title>
<variablelist>
<varlistentry>
<term><envar>PGDATABASE</envar></term>
<term><envar>PGHOST</envar></term>
<term><envar>PGPORT</envar></term>
<term><envar>PGUSER</envar></term>
<listitem>
<para>
Default connection parameters
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Diagnostics</title>
<para>
Most error messages are self-explanatory. If not, run
<application>droplang</application> with the <option>--echo</option>
option and see under the respective <acronym>SQL</acronym> command
for details.
</para>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
Use <xref linkend="app-createlang"> to add a language.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
To remove the language <literal>pltcl</literal>:
<screen>
<prompt>$ </prompt><userinput>droplang pltcl dbname</userinput>
</screen>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<simplelist type="inline">
<member><xref linkend="app-createlang"></member>
<member><xref linkend="sql-droplanguage" endterm="sql-droplanguage-title"></member>
<member>Environment Variables (<xref linkend="libpq-envars">)</member>
</simplelist>
</refsect1>
</refentry>