pg-get-notify.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: cfeb14a38b666f6a3fc73da70f4a90fbe115e53f Maintainer: dallas Status: ready -->
<!-- CREDITS: mowangjuanzi -->
<refentry xml:id="function.pg-get-notify" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_get_notify</refname>
    <refpurpose>获取 SQL NOTIFY 消息</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>pg_get_notify</methodname>
   <methodparam><type>PgSql\Connection</type><parameter>connection</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>mode</parameter><initializer><constant>PGSQL_ASSOC</constant></initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_get_notify</function> 取得 SQL 命令 <literal>NOTIFY</literal>
   生成的消息。要接收通知，必须发送 SQL 命令 <literal>LISTEN</literal>。
  </para>
 </refsect1>

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

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   包含 <literal>NOTIFY</literal> 消息名称和后端 PID 的 <type>array</type>。如果服务器支持，该数组还包含服务器版本和有效负载。否则，如果没有
   <literal>NOTIFY</literal> 正在等待，则返回 &false;。
  </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 NOTIFY 消息</title>
    <programlisting role="php">
<![CDATA[
<?php 
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
  echo "An error occurred.\n";
  exit;
}

// 从其它进程监听 'author_updated' 消息
pg_query($conn, 'LISTEN author_updated;');
$notify = pg_get_notify($conn);
if (!$notify) {
  echo "No messages\n";
} else {
  print_r($notify);
}
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

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