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111 lines
6.3 KiB
HTML
111 lines
6.3 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>释放结果内存</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.mysql-free-result" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_free_result</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_free_result</span> — <span class="dc-title">释放结果内存</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mysql-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>mysql_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>mysql_free_result()</strong></span> 将释放所有与结果标识符
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<code class="parameter">result</code> 所关联的内存。
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</p>
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<p class="para">
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<span class="function"><strong>mysql_free_result()</strong></span>
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仅需要在考虑到返回很大的结果集时会占用多少内存时调用。在脚本结束后所有关联的内存都会被自动释放。
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</p>
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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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<p class="para">
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为向下兼容仍然可以使用
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<span class="function"><strong>mysql_freeresult()</strong></span>，但反对这样做。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mysql-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">
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result</code></dt>
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<dd>
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<p class="para"><span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>
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型的结果集。此结果集来自对 <span class="function"><a href="mysql_query.html" class="function">mysql_query()</a></span>
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的调用。</p></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.mysql-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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<p class="para">
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If a non-resource is used for the <code class="parameter">result</code>, an
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error of level E_WARNING will be emitted. It's worth noting that
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<span class="function"><a href="mysql_query.html" class="function">mysql_query()</a></span> only returns a <span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>
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for SELECT, SHOW, EXPLAIN, and DESCRIBE queries.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.mysql-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-2149">
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<p><strong>Example #1 A <span class="function"><strong>mysql_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 />$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id,email FROM people WHERE id = '42'"</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'Could not run query: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br /> exit;<br />}<br /></span><span style="color: #FF8000">/* Use the result, assuming we're done with it afterwards */<br /></span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_assoc</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Now we free up the result and continue on with our script */<br /></span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">'id'</span><span style="color: #007700">];<br />echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">'email'</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 class="refsect1 notes" id="refsect1-function.mysql-free-result-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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为了向下兼容，可以使用下列已废弃的别名：
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<span class="function"><strong>mysql_freeresult()</strong></span>
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.mysql-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="mysql_query.html" class="function" rel="rdfs-seeAlso">mysql_query()</a> - 发送一条 MySQL 查询</span></li>
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<li class="member"><span class="function"><a href="is_resource.html" class="function" rel="rdfs-seeAlso">is_resource()</a> - 检测变量是否为资源类型</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> |