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56 lines
4.7 KiB
HTML
56 lines
4.7 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>取得结果数据</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-result" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_result</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_result</span> — <span class="dc-title">取得结果数据</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.mysql-result-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>mysql_result</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$row</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$field</code></span>
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] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>mysql_result()</strong></span> 返回 MySQL
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结果集中一个单元的内容。字段参数可以是字段的偏移量或者字段名，或者是字段表点字段名（tablename.fieldname）。如果给列起了别名（'select
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foo as bar from...'），则用别名替代列名。
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</p>
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<p class="para">
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当作用于很大的结果集时，应该考虑使用能够取得整行的函数（在下边指出）。这些函数在一次函数调用中返回了多个单元的内容，比
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<span class="function"><strong>mysql_result()</strong></span>
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快得多。此外注意在字段参数中指定数字偏移量比指定字段名或者
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tablename.fieldname 要快得多。
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</p>
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<p class="para">
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调用 <span class="function"><strong>mysql_result()</strong></span>
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不能和其它处理结果集的函数混合调用。
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</p>
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<p class="para">
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<div class="example" id="example-2166">
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<p><strong>Example #1 <span class="function"><strong>mysql_result()</strong></span> 例子</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 /> $link </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">, </span><span style="color: #DD0000">"mysql_user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"mysql_password"</span><span style="color: #007700">)<br /> or die(</span><span style="color: #DD0000">"Could not connect: " </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">());<br /><br /> </span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT name FROM work.employee"</span><span style="color: #007700">)<br /> or die(</span><span style="color: #DD0000">"Could not query: . mysql_error());<br /><br /> echo mysql_result(</span><span style="color: #0000BB">$result</span><span style="color: #DD0000">,2); // outputs third employee's name<br /><br /> mysql_close(</span><span style="color: #0000BB">$link</span><span style="color: #DD0000">);<br />?></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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<p class="para">
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推荐使用高性能的替代函数：<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span>，<span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span>，<span class="function"><a href="mysql_fetch_assoc.html" class="function">mysql_fetch_assoc()</a></span>
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和 <span class="function"><a href="mysql_fetch_object.html" class="function">mysql_fetch_object()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |