数据库系统

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drop_trigger.sgml：源码内容
							<refentry id="SQL-DROPTRIGGER">
 <refmeta>
  <refentrytitle>
   DROP TRIGGER
  </refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>
 <refnamediv>
  <refname>
   DROP TRIGGER
  </refname>
  <refpurpose>
   Removes the definition of a trigger
  </refpurpose> 
 </refnamediv>            
 <refsynopsisdiv>
  <refsynopsisdivinfo>
   <date>1998-09-22</date>
  </refsynopsisdivinfo>
  <synopsis>
DROP TRIGGER <replaceable class="PARAMETER">name</replaceable> ON <replaceable class="PARAMETER">table</replaceable>
  </synopsis>
  <refsect2 id="R2-SQL-DROPTRIGGER-1">
   <refsect2info>
    <date>1998-09-22</date>
   </refsect2info>
   <title>
    Inputs
   </title>
   <para>
    <variablelist>
     <varlistentry>
      <term><replaceable class="PARAMETER">name</replaceable></term>
      <listitem>
       <para>
	The name of an existing trigger.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><replaceable class="PARAMETER">table</replaceable></term>
      <listitem>
       <para>
	The name of a table.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>
  <refsect2 id="R2-SQL-DROPTRIGGER-2">
   <refsect2info>
    <date>1998-09-22</date>
   </refsect2info>
   <title>
    Outputs
   </title>
   <para>
    <variablelist>
     <varlistentry>
      <term><computeroutput>
DROP
       </computeroutput></term>
      <listitem>
       <para>
	The message returned if the trigger is successfully dropped.
       </para>
      </listitem>
     </varlistentry>
     <varlistentry>
      <term><computeroutput>
ERROR: DropTrigger: there is no trigger <replaceable class="PARAMETER">name</replaceable> on relation "<replaceable class="parameter">table</replaceable>"
       </computeroutput></term>
      <listitem>
       <para>
	This message occurs if the trigger specified does not exist.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>
 </refsynopsisdiv>
 <refsect1 id="R1-SQL-DROPTRIGGER-1">
  <refsect1info>
   <date>1998-09-22</date>
  </refsect1info>
  <title>
   Description
  </title>
  <para>
   <command>DROP TRIGGER</command> will remove all references to an existing
   trigger definition. To execute this command the current
   user must be the owner of the trigger.
  </para>
  <refsect2 id="R2-SQL-DROPTRIGGER-3">
   <refsect2info>
    <date>1998-09-22</date>
   </refsect2info>
   <title>
    Notes
   </title>
   <para>
    <command>DROP TRIGGER</command> is a <productname>Postgres</productname>
    language extension.
   </para>
   <para>
    Refer to <command>CREATE TRIGGER</command> for
    information on how to create triggers.
   </para>
  </refsect2>
 </refsect1>
  
 <refsect1 id="R1-SQL-DROPTRIGGER-2">
  <title>
   Usage
  </title>
  <para>
   Destroy the <literal>if_dist_exists</literal> trigger
   on table <literal>films</literal>:
   <programlisting>
DROP TRIGGER if_dist_exists ON films;
   </programlisting>
  </para>
 </refsect1>
 
 <refsect1 id="R1-SQL-DROPTRIGGER-3">
  <title>
   Compatibility
  </title>
  <para>
  </para>
  
  <refsect2 id="R2-SQL-DROPTRIGGER-4">
   <refsect2info>
    <date>1998-09-22</date>
   </refsect2info>
   <title>
    SQL92
   </title>
   <para>
    There is no <command>DROP TRIGGER</command> statement in
    <acronym>SQL92</acronym>.
   </para>
  </refsect2>
 </refsect1>
</refentry>
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