alter_trigger.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_trigger.sgml,v 1.9 2005/08/24 17:24:19 tgl Exp $
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<refentry id="SQL-ALTERTRIGGER">
 <refmeta>
  <refentrytitle id="sql-altertrigger-title">ALTER TRIGGER</refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>

 <refnamediv>
  <refname>ALTER TRIGGER</refname>
  <refpurpose>change the definition of a trigger</refpurpose>
 </refnamediv>

 <indexterm zone="sql-altertrigger">
  <primary>ALTER TRIGGER</primary>
 </indexterm>

 <refsynopsisdiv>
<synopsis>
ALTER TRIGGER <replaceable class="PARAMETER">name</replaceable> ON <replaceable class="PARAMETER">table</replaceable> RENAME TO <replaceable class="PARAMETER">newname</replaceable>
</synopsis>
 </refsynopsisdiv>

 <refsect1>
  <title>Description</title>

  <para>
   <command>ALTER TRIGGER</command> changes properties of an existing
   trigger.  The <literal>RENAME</literal> clause changes the name of
   the given trigger without otherwise changing the trigger
   definition.
  </para>

  <para>
   You must own the table on which the trigger acts to be allowed to change its properties.
  </para>
 </refsect1>

 <refsect1>
  <title>Parameters</title>

  <variablelist>
   <varlistentry>
    <term><replaceable class="PARAMETER">name</replaceable></term>
    <listitem>
     <para>
      The name of an existing trigger to alter.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="PARAMETER">table</replaceable></term>
    <listitem>
     <para>
      The name of the table on which this trigger acts.
     </para>
    </listitem>
   </varlistentry>

   <varlistentry>
    <term><replaceable class="PARAMETER">newname</replaceable></term>
    <listitem>
     <para>
      The new name for the trigger.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1>
  <title>Notes</title>

   <para>
    The ability to temporarily enable or disable a trigger is provided by
    <xref linkend="SQL-ALTERTABLE" endterm="SQL-ALTERTABLE-TITLE">, not by
    <command>ALTER TRIGGER</>, because <command>ALTER TRIGGER</> has no
    convenient way to express the option of enabling or disabling all of
    a table's triggers at once.
   </para>
 </refsect1>

 <refsect1>
  <title>Examples</title>

  <para>
   To rename an existing trigger:
<programlisting>
ALTER TRIGGER emp_stamp ON emp RENAME TO emp_track_chgs;
</programlisting>
  </para>
 </refsect1>

 <refsect1>
  <title>Compatibility</title>

  <para>
   <command>ALTER TRIGGER</command> is a <productname>PostgreSQL</>
   extension of the SQL standard.
  </para>
 </refsect1>

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

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

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