drop_language.sgml

postgresql8.3.4源码,开源数据库

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$PostgreSQL: pgsql/doc/src/sgml/ref/drop_language.sgml,v 1.26 2007/05/15 19:13:55 neilc Exp $
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<refentry id="SQL-DROPLANGUAGE">
 <refmeta>
  <refentrytitle id="SQL-DROPLANGUAGE-TITLE">DROP LANGUAGE</refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>DROP LANGUAGE</refname>
  <refpurpose>remove a procedural language</refpurpose>
 </refnamediv>

 <indexterm zone="sql-droplanguage">
  <primary>DROP LANGUAGE</primary>
 </indexterm>

 <refsynopsisdiv>
<synopsis>
DROP [ PROCEDURAL ] LANGUAGE [ IF EXISTS ] <replaceable class="PARAMETER">name</replaceable> [ CASCADE | RESTRICT ]
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>DROP LANGUAGE</command> removes the definition of a
   previously registered procedural language.  You must be a superuser
   or the owner of the language to use <command>DROP LANGUAGE</>.
  </para>
 </refsect1>
  
 <refsect1>
  <title>Parameters</title>

  <variablelist>

   <varlistentry>
    <term><literal>IF EXISTS</literal></term>
    <listitem>
     <para>
      Do not throw an error if the language does not exist. A notice is issued 
      in this case.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="PARAMETER">name</replaceable></term>
    <listitem>
     <para>
      The name of an existing procedural language.  For backward
      compatibility, the name can be enclosed by single quotes.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>CASCADE</literal></term>
    <listitem>
     <para>
      Automatically drop objects that depend on the language (such as
      functions in the language).
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><literal>RESTRICT</literal></term>
    <listitem>
     <para>
      Refuse to drop the language if any objects depend on it.  This
      is the default.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>
  
 <refsect1>
  <title>Examples</title>

  <para>
   This command removes the procedural language
   <literal>plsample</literal>:

<programlisting>
DROP LANGUAGE plsample;
</programlisting>
  </para>
 </refsect1>
 
 <refsect1>
  <title>Compatibility</title>

  <para>
   There is no <command>DROP LANGUAGE</command> statement in the SQL
   standard.
  </para>
 </refsect1>

 <refsect1>
  <title>See Also</title>

  <simplelist type="inline">
   <member><xref linkend="sql-alterlanguage" endterm="sql-alterlanguage-title"></member>
   <member><xref linkend="sql-createlanguage" endterm="sql-createlanguage-title"></member>
   <member><xref linkend="app-droplang"></member>
  </simplelist>
 </refsect1>

</refentry>