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102 lines
6.1 KiB
HTML
102 lines
6.1 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>释放查询结果占用的内存</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-free-result" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_free_result</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_free_result</span> — <span class="dc-title">释放查询结果占用的内存</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.pg-free-result-description">
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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_free_result</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</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_free_result()</strong></span> 仅在当你担心脚本执行时占用了过多内存时调用。脚本执行完毕后所有的查询结果占用的内存都会被自动释放。不过如果你确认在脚本中不会再用到查询结果了，你可以用 <code class="parameter">result</code> 作为参数调用 <span class="function"><strong>pg_free_result()</strong></span> 来释放有关的内存。成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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本函数以前的名字为 <em>pg_freeresult()</em>。
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</p>
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</p></blockquote>
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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>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.pg-free-result-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">result</code></dt>
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<dd>
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<p class="para">
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PostgreSQL query result resource, returned by <span class="function"><a href="pg_query.html" class="function">pg_query()</a></span>,
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<span class="function"><a href="pg_query_params.html" class="function">pg_query_params()</a></span> or <span class="function"><a href="pg_execute.html" class="function">pg_execute()</a></span>
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(among others).
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.pg-free-result-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.pg-free-result-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-2497">
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<p><strong>Example #1 <span class="function"><strong>pg_free_result()</strong></span> example</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 />$db </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=users user=me"</span><span style="color: #007700">) || die();<br /><br /></span><span style="color: #0000BB">$res </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$db</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT 1 UNION ALL SELECT 2"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$val </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_fetch_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #DD0000">"First field in the second row is: "</span><span style="color: #007700">, </span><span style="color: #0000BB">$val</span><span style="color: #007700">, </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">pg_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</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>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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First field in the second row is: 2
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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 class="refsect1 seealso" id="refsect1-function.pg-free-result-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="pg_query.html" class="function" rel="rdfs-seeAlso">pg_query()</a> - 执行查询</span></li>
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<li class="member"><span class="function"><a href="pg_query_params.html" class="function" rel="rdfs-seeAlso">pg_query_params()</a> - Submits a command to the server and waits for the result, with the ability to pass parameters separately from the SQL command text</span></li>
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<li class="member"><span class="function"><a href="pg_execute.html" class="function" rel="rdfs-seeAlso">pg_execute()</a> - Sends a request to execute a prepared statement with given parameters, and waits for the result</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |