alter_conversion.sgml

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

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$PostgreSQL: pgsql/doc/src/sgml/ref/alter_conversion.sgml,v 1.7 2005/10/13 22:44:51 tgl Exp $
PostgreSQL documentation
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<refentry id="SQL-ALTERCONVERSION">
 <refmeta>
  <refentrytitle id="SQL-ALTERCONVERSION-TITLE">ALTER CONVERSION</refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>ALTER CONVERSION</refname>
  <refpurpose>change the definition of a conversion</refpurpose>
 </refnamediv>  
  
 <indexterm zone="sql-alterconversion">
  <primary>ALTER CONVERSION</primary>
 </indexterm>

 <refsynopsisdiv>
<synopsis>
ALTER CONVERSION <replaceable>name</replaceable> RENAME TO <replaceable>newname</replaceable>
ALTER CONVERSION <replaceable>name</replaceable> OWNER TO <replaceable>newowner</replaceable>
</synopsis>
 </refsynopsisdiv>
  
 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER CONVERSION</command> changes the definition of a
   conversion.
  </para>

  <para>
   You must own the conversion to use <command>ALTER CONVERSION</>.
   To alter the owner, you must also be a direct or indirect member of the new
   owning role, and that role must have <literal>CREATE</literal> privilege on
   the conversion's schema.  (These restrictions enforce that altering the
   owner doesn't do anything you couldn't do by dropping and recreating the
   conversion. However, a superuser can alter ownership of any conversion
   anyway.)
  </para>
 </refsect1>
  
 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><replaceable class="parameter">name</replaceable></term>
    <listitem>
     <para>
      The name (optionally schema-qualified) of an existing conversion.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">newname</replaceable></term>
    <listitem>
     <para>
      The new name of the conversion.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="parameter">newowner</replaceable></term>
    <listitem>
     <para>
      The new owner of the conversion.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   To rename the conversion <literal>iso_8859_1_to_utf8</literal> to
   <literal>latin1_to_unicode</literal>:
<programlisting>
ALTER CONVERSION iso_8859_1_to_utf8 RENAME TO latin1_to_unicode;
</programlisting>
  </para>

  <para>
   To change the owner of the conversion <literal>iso_8859_1_to_utf8</literal> to
   <literal>joe</literal>:
<programlisting>
ALTER CONVERSION iso_8859_1_to_utf8 OWNER TO joe;
</programlisting>
  </para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

  <para>
   There is no <command>ALTER CONVERSION</command> statement in the SQL
   standard.
  </para>
 </refsect1>

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

  <simplelist type="inline">
   <member><xref linkend="sql-createconversion" endterm="sql-createconversion-title"></member>
   <member><xref linkend="sql-dropconversion" endterm="sql-dropconversion-title"></member>
  </simplelist>
 </refsect1>
</refentry>

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