<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >pg_ping</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_pconnect" HREF="function.pg-pconnect.html"><LINK REL="NEXT" TITLE="pg_port" HREF="function.pg-port.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-pconnect.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-port.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.pg-ping" ></A >pg_ping</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN186408" ></A ><P > (PHP 4 >= 4.3.0, PHP 5)</P >pg_ping -- Ping 数据库连接</DIV ><DIV CLASS="refsect1" ><A NAME="AEN186411" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >pg_ping</B > ( resource connection )<BR ></BR ><P > <B CLASS="function" >pg_ping()</B > ping 数据库连接,如果中断则尝试重新连接。如果连接在活动状态返回 <TT CLASS="constant" ><B >TRUE</B ></TT >,否则返回 <TT CLASS="constant" ><B >FALSE</B ></TT >。 </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN186424" ></A ><P ><B >例 1. <B CLASS="function" >pg_ping()</B ></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 />if (!</font><font color="#0000BB">pg_ping</font><font color="#007700">(</font><font color="#0000BB">$conn</font><font color="#007700">))<br /> die(</font><font color="#DD0000">"Connection is broken\n"</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > 参见 <A HREF="function.pg-connection-status.html" ><B CLASS="function" >pg_connection_status()</B ></A > 和 <A HREF="function.pg-connection-reset.html" ><B CLASS="function" >pg_connection_reset()</B ></A >。 </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-pconnect.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-port.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >pg_pconnect</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_port</TD ></TR ></TABLE ></DIV ></BODY ></HTML >