<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >pg_get_notify</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="PostgreSQL 数据库函数" HREF="ref.pgsql.html"><LINK REL="PREVIOUS" TITLE="pg_free_result" HREF="function.pg-free-result.html"><LINK REL="NEXT" TITLE="pg_get_pid" HREF="function.pg-get-pid.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.pg-free-result.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.pg-get-pid.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.pg-get-notify" ></A >pg_get_notify</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN185696" ></A ><P > (PHP 4 >= 4.3.0, PHP 5)</P >pg_get_notify -- Ping 数据库连接</DIV ><DIV CLASS="refsect1" ><A NAME="AEN185699" ></A ><H2 >说明</H2 >array <B CLASS="methodname" >pg_get_notify</B > ( resource connection [, int result_type] )<BR ></BR ><P > <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 > 参见 <A HREF="function.pg-get-pid.html" ><B CLASS="function" >pg_get_pid()</B ></A >。 </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN185718" ></A ><P ><B >例 1. PostgreSQL NOTIFY 消息</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?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 /> echo </font><font color="#DD0000">"An error occured.\n"</font><font color="#007700">;<br /> 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 /> print(</font><font color="#DD0000">"No messages\n"</font><font color="#007700">);<br />else<br /> </font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">$notify</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.pg-free-result.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.pg-get-pid.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >pg_free_result</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.pgsql.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >pg_get_pid</TD ></TR ></TABLE ></DIV ></BODY ></HTML >