mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-18 05:26:57 +08:00
82 lines
7.6 KiB
HTML
82 lines
7.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
<html>
|
||
<head>
|
||
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
|
||
<title>Pings a server connection, or tries to reconnect if the connection has gone down</title>
|
||
</head>
|
||
<body class="docs"><div id="layout">
|
||
<div id="layout-content"><div id="function.maxdb-ping" class="refentry">
|
||
<div class="refnamediv">
|
||
<h1 class="refname">maxdb_ping</h1>
|
||
<h1 class="refname">maxdb::ping</h1>
|
||
<p class="verinfo">(PECL maxdb >= 1.0)</p><p class="refpurpose"><span class="refname">maxdb_ping</span> -- <span class="refname">maxdb::ping</span> — <span class="dc-title">Pings a server connection, or tries to reconnect if the connection has gone down</span></p>
|
||
|
||
</div>
|
||
|
||
<div class="refsect1 description" id="refsect1-function.maxdb-ping-description">
|
||
<h3 class="title">说明</h3>
|
||
<p class="para">过程化风格</p>
|
||
<div class="methodsynopsis dc-description">
|
||
<span class="methodname"><strong>maxdb_ping</strong></span>
|
||
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link</code></span>
|
||
) : <span class="type">bool</span></div>
|
||
|
||
<p class="para rdfs-comment">面向对象风格</p>
|
||
<div class="methodsynopsis dc-description">
|
||
<span class="methodname"><strong>maxdb::ping</strong></span>
|
||
( <span class="methodparam">void</span>
|
||
) : <span class="type">bool</span></div>
|
||
|
||
<p class="para rdfs-comment">
|
||
Checks whether the connection to the server is working. If it has gone
|
||
down, and global option <em>maxdb.reconnect</em> is enabled
|
||
an automatic reconnection is attempted.
|
||
</p>
|
||
<p class="para">
|
||
This function can be used by clients that remain idle for a long while,
|
||
to check whether the server has closed the connection and reconnect if
|
||
necessary.
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 returnvalues" id="refsect1-function.maxdb-ping-returnvalues">
|
||
<h3 class="title">返回值</h3>
|
||
<p class="para">
|
||
成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 examples" id="refsect1-function.maxdb-ping-examples">
|
||
<h3 class="title">范例</h3>
|
||
<div class="example" id="example-1387">
|
||
<p><strong>Example #1 面向对象风格</strong></p>
|
||
<div class="example-contents">
|
||
<div class="phpcode"><pre><span style="color: #000000">
|
||
<span style="color: #0000BB"><?php<br />$maxdb </span><span style="color: #007700">= new </span><span style="color: #0000BB">maxdb</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* check if server is alive */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">ping</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"Our connection is ok!\n"</span><span style="color: #007700">);<br />} else {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"Error: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">error</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">$maxdb</span><span style="color: #007700">-></span><span style="color: #0000BB">close</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
|
||
</span>
|
||
</pre></div>
|
||
</div>
|
||
|
||
</div>
|
||
<div class="example" id="example-1388">
|
||
<p><strong>Example #2 过程化风格</strong></p>
|
||
<div class="example-contents">
|
||
<div class="phpcode"><pre><span style="color: #000000">
|
||
<span style="color: #0000BB"><?php<br />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">maxdb_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"MONA"</span><span style="color: #007700">, </span><span style="color: #DD0000">"RED"</span><span style="color: #007700">, </span><span style="color: #DD0000">"DEMODB"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* check connection */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_connect_errno</span><span style="color: #007700">()) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"Connect failed: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_connect_error</span><span style="color: #007700">());<br /> exit();<br />}<br /><br /></span><span style="color: #FF8000">/* check if server is alive */<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">maxdb_ping</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"Our connection is ok!\n"</span><span style="color: #007700">);<br />} else {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"Error: %s\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">maxdb_error</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">));<br />}<br /><br /></span><span style="color: #FF8000">/* close connection */<br /></span><span style="color: #0000BB">maxdb_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
|
||
</span>
|
||
</pre></div>
|
||
</div>
|
||
|
||
</div>
|
||
<p class="para">以上例程的输出类似于：</p>
|
||
<div class="example-contents screen">
|
||
<div class="cdata"><pre>
|
||
Our connection is ok!
|
||
</pre></div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
</div></div></div></body></html> |