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46 lines
3.7 KiB
HTML
46 lines
3.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Ping 数据库连接</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.pg-get-notify" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_get_notify</h1>
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<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_get_notify</span> — <span class="dc-title">Ping 数据库连接</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.pg-get-notify-unknown-seealsp">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>pg_get_notify</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$connection</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$result_type</code></span>
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] ) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>pg_get_notify()</strong></span> 取得 SQL 命令
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<em>NOTIFY</em>
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发送的通告消息。要接收通告消息，必须发送 SQL 命令
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<em>LISTEN</em>。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
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PID。如果没有消息则返回 <strong><code>FALSE</code></strong>。
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</p>
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<p class="para">
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参见 <span class="function"><a href="pg_get_pid.html" class="function">pg_get_pid()</a></span>。
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</p>
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<p class="para">
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<div class="example" id="example-2498">
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<p><strong>Example #1 PostgreSQL NOTIFY 消息</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php <br />$conn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=publisher"</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$conn</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"An error occured.\n"</span><span style="color: #007700">;<br /> exit;<br />}<br /><br /></span><span style="color: #FF8000">// Listen 'author_updated' message from other processes<br /></span><span style="color: #0000BB">pq_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #DD0000">'LISTEN author_updated;'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$notify </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_get_notify</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$notify</span><span style="color: #007700">)<br /> print(</span><span style="color: #DD0000">"No messages\n"</span><span style="color: #007700">);<br />else<br /> </span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$notify</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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</div></div></div></body></html> |