pg-get-pid.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: c2eca73ef79ebe78cebb34053e41b565af504c4f Maintainer: dallas Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<refentry xml:id="function.pg-get-pid" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_get_pid</refname>
  <refpurpose>获取后端的进程 ID</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>pg_get_pid</methodname>
   <methodparam><type>PgSql\Connection</type><parameter>connection</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_get_pid</function> 取得后端（数据库服务器进程）的 PID。PID 用来确定通过
   <function>pg_get_notify</function> 接收到的 <literal>NOTIFY</literal> 消息，是否是其它进程发送的。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      &pgsql.parameter.connection;
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   后端数据库进程 ID。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &pgsql.changelog.connection-object;
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
   <title>PostgreSQL 后端 PID</title>
    <programlisting role="php">
<![CDATA[
<?php 
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
  echo "An error occurred.\n";
  exit;
}

// Backend process PID. Use PID with pg_get_notify()
$pid = pg_get_pid($conn);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_get_notify</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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