数据库系统

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reset.sgml：源码内容
							<refentry id="SQL-RESET">
 <refmeta>
  <refentrytitle>
   RESET
  </refentrytitle>
  <refmiscinfo>SQL - Language Statements</refmiscinfo>
 </refmeta>
 <refnamediv>
  <refname>
   RESET
  </refname>
  <refpurpose>
   Restores run-time parameters for session to default values
  </refpurpose>
 </refnamediv>
 <refsynopsisdiv>
  <refsynopsisdivinfo>
   <date>1998-09-24</date>
  </refsynopsisdivinfo>
  <synopsis>
RESET <replaceable class="PARAMETER">variable</replaceable>
  </synopsis>
  <refsect2 id="R2-SQL-RESET-1">
   <refsect2info>
    <date>1998-09-24</date>
   </refsect2info>
   <title>
    Inputs
   </title>
   <para>		
    <variablelist>
     <varlistentry>
      <term><replaceable class="PARAMETER">variable</replaceable></term>
      <listitem>
       <para>
	Refer to the SET statement for more information on available
	variables.
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>
  <refsect2 id="R2-SQL-RESET-2">
   <refsect2info>
    <date>1998-09-24</date>
   </refsect2info>
   <title>
    Outputs
   </title>
   <para>
    <variablelist>
     <varlistentry>
      <term><computeroutput>
RESET VARIABLE
       </computeroutput></term>
      <listitem>
       <para>
	Message returned if 
	<replaceable class="PARAMETER">variable</replaceable> is successfully reset
	to its default value..
       </para>
      </listitem>
     </varlistentry>
    </variablelist>
   </para>
  </refsect2>
 </refsynopsisdiv>
  
 <refsect1 id="R1-SQL-RESET-1">
  <refsect1info>
   <date>1998-09-24</date>
  </refsect1info>
  <title>
   Description
  </title>
  <para>
   <command>RESET</command> restores variables to the
   default values.
   Refer to the <command>SET</command> command for details on
   allowed values and defaults.
   <command>RESET</command> is an alternate form for
   <command>SET <replaceable class="parameter">variable</replaceable> = DEFAULT</command>
  </para>
  <refsect2 id="R2-SQL-RESET-3">
   <refsect2info>
    <date>1998-09-24</date>
   </refsect2info>
   <title>
    Notes
   </title>
   <para>
    The RESET statement is a <productname>Postgres</productname>
    language extension.
   </para>
   <para>
    Refer to SET/SHOW statements to set/show variable values.
   </para>
  </refsect2>
 </refsect1>
  
 <refsect1 id="R1-SQL-RESET-2">
  <title>
   Usage
  </title>
  <para>
   Set DateStyle to its default value:
   <programlisting>
RESET DateStyle;
   </programlisting>
  </para>
  <para>
   Set Geqo to its default value:
   <programlisting>   
RESET GEQO;
   </programlisting>
  </para>
 </refsect1>
 <refsect1 id="R1-SQL-RESET-3">
  <title>
   Compatibility
  </title>
  <refsect2 id="R2-SQL-RESET-4">
   <refsect2info>
    <date>1998-09-24</date>
   </refsect2info>
   <title>
    SQL92
   </title>
   <para>
    There is no <command>RESET</command> in <acronym>SQL92</acronym>.
   </para>
  </refsect2>
 </refsect1>
</refentry>
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