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70 lines
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HTML
70 lines
6.8 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>发送异步查询</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-send-query" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_send_query</h1>
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<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_send_query</span> — <span class="dc-title">
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发送异步查询
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</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.pg-send-query-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_send_query</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$connection</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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) : <span class="type">bool</span></div>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>pg_send_query</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$query</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>pg_send_query()</strong></span> 向 <code class="parameter">connection</code>
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连接发送异步查询。和 <span class="function"><a href="pg_query.html" class="function">pg_query()</a></span> 不同，它可以向 PostgreSQL
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发送多个查询并用 <span class="function"><a href="pg_get_result.html" class="function">pg_get_result()</a></span>
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依次得到结果。当执行查询时脚本的执行不会被锁定。用
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<span class="function"><a href="pg_connection_busy.html" class="function">pg_connection_busy()</a></span> 来检查连接连接是否为忙（即查询正在执行中）。调用
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<span class="function"><a href="pg_cancel_query.html" class="function">pg_cancel_query()</a></span> 则有可能取消查询。
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</p>
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<p class="para">
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尽管用户可以一次发送多个查询，但用户不能通过正忙的连接发送多个查询。如果向正忙的连接发送了查询，则会等待上一条查询结束并丢弃所有结果。
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</p>
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<p class="para">
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<div class="example" id="example-2518">
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<p><strong>Example #1 异步查询</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 /> $dbconn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=publisher"</span><span style="color: #007700">) or die(</span><span style="color: #DD0000">"Could not connect"</span><span style="color: #007700">);<br /> if (!</span><span style="color: #0000BB">pg_connection_busy</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">pg_send_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">,</span><span style="color: #DD0000">"select * from authors; select count(*) from authors;"</span><span style="color: #007700">);<br /> }<br /> </span><span style="color: #0000BB">$res1 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_get_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"First call to pg_get_result(): </span><span style="color: #0000BB">$res1</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$rows1 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$res1</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"</span><span style="color: #0000BB">$res1</span><span style="color: #DD0000"> has </span><span style="color: #0000BB">$rows1</span><span style="color: #DD0000"> records\n\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$res2 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_get_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbconn</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"second call to pg_get_result(): </span><span style="color: #0000BB">$res2</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$rows2 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$res2</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">"</span><span style="color: #0000BB">$res2</span><span style="color: #DD0000"> has </span><span style="color: #0000BB">$rows2</span><span style="color: #DD0000"> records\n"</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 class="example-contents"><p>
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上例输出如下：
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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first call to pg_get_result(): Resource id #3
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Resource id #3 has 3 records
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second call to pg_get_result(): Resource id #4
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Resource id #4 has 1 records
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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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<p class="para">
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参见 <span class="function"><a href="pg_query.html" class="function">pg_query()</a></span>，<span class="function"><a href="pg_cancel_query.html" class="function">pg_cancel_query()</a></span>，<span class="function"><a href="pg_get_result.html" class="function">pg_get_result()</a></span>
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和 <span class="function"><a href="pg_connection_busy.html" class="function">pg_connection_busy()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |