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>pg_get_notify</H1
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>    (PHP 4 &#62;= 4.3.0, PHP 5)</P
>pg_get_notify&nbsp;--&nbsp;Ping 数据库连接</DIV
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><H2
>说明</H2
>array <B
CLASS="methodname"
>pg_get_notify</B
> ( resource connection [, int result_type] )<BR
></BR
><P
>&#13;     <B
CLASS="function"
>pg_get_notify()</B
> 取得 SQL 命令
     <TT
CLASS="literal"
>NOTIFY</TT
>
     发送的通告消息。要接收通告消息，必须发送 SQL 命令
     <TT
CLASS="literal"
>LISTEN</TT
>。如果连接中有通告消息，则数组包含消息名并且返回后端的
     PID。如果没有消息则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
    </P
><P
>&#13;     参见 <A
HREF="function.pg-get-pid.html"
><B
CLASS="function"
>pg_get_pid()</B
></A
>。
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>例 1. PostgreSQL NOTIFY 消息</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php <br />$conn </font><font color="#007700">= </font><font color="#0000BB">pg_pconnect</font><font color="#007700">(</font><font color="#DD0000">"dbname=publisher"</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$conn</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"An error occured.\n"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;exit;<br />}<br /><br /></font><font color="#FF8000">// Listen 'author_updated' message from other processes<br /></font><font color="#0000BB">pq_query</font><font color="#007700">(</font><font color="#0000BB">$conn</font><font color="#007700">, </font><font color="#DD0000">'LISTEN author_updated;'</font><font color="#007700">);<br /></font><font color="#0000BB">$notify </font><font color="#007700">= </font><font color="#0000BB">pg_get_notify</font><font color="#007700">(</font><font color="#0000BB">$conn</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$notify</font><font color="#007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;print(</font><font color="#DD0000">"No messages\n"</font><font color="#007700">);<br />else<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">$notify</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
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