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148 lines
11 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>取得结果中指定字段的字段名</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-field-name" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_field_name</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_field_name</span> — <span class="dc-title">
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取得结果中指定字段的字段名
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mysql-field-name-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_field_name</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$field_index</code></span>
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) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>mysql_field_name()</strong></span>
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返回指定字段索引的字段名。<code class="parameter">result</code>
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必须是一个合法的结果标识符，<code class="parameter">field_index</code>
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是该字段的数字偏移量。
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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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<code class="parameter">field_index</code> 从 0 开始。
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</p>
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<p class="para">
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例如，第三个字段的索引值其实是 2，第四个字段的索引值是 3，以此类推。
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</p>
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</p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数返回的字段名<em class="emphasis">大小写敏感</em>。</span></p></blockquote>
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<p class="para">
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<div class="example" id="example-2145">
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<p><strong>Example #1 <span class="function"><strong>mysql_field_name()</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 /></span><span style="color: #FF8000">/* The users table consists of three fields:<br /> * user_id<br /> * username<br /> * password.<br /> */<br /></span><span style="color: #0000BB">$link </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">, </span><span style="color: #DD0000">"mysql_user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"mysql_password"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$dbname </span><span style="color: #007700">= </span><span style="color: #DD0000">"mydb"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbname</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">)<br /> or die(</span><span style="color: #DD0000">"Could not set </span><span style="color: #0000BB">$dbname</span><span style="color: #DD0000">: " </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">());<br /></span><span style="color: #0000BB">$res </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"select * from users"</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">mysql_field_name</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">mysql_field_name</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">, </span><span style="color: #0000BB">2</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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以上例子将产生如下输出：
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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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user_id
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password
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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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为向下兼容仍然可以使用 <span class="function"><strong>mysql_fieldname()</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-field-name-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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<dt>
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<code class="parameter">
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field_offset</code></dt>
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<dd>
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<p class="para">数值型字段偏移量。
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<code class="parameter">field_offset</code> 从 <em>0</em> 开始。如果
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<code class="parameter">field_offset</code> 不存在，则会发出一个
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<strong><code>E_WARNING</code></strong> 级别的错误</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-field-name-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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The name of the specified field index on success 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.mysql-field-name-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-2146">
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<p><strong>Example #2 <span class="function"><strong>mysql_field_name()</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 /></span><span style="color: #FF8000">/* The users table consists of three fields:<br /> * user_id<br /> * username<br /> * password.<br /> */<br /></span><span style="color: #0000BB">$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 />if (!</span><span style="color: #0000BB">$link</span><span style="color: #007700">) {<br /> die(</span><span style="color: #DD0000">'Could not connect to MySQL server: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">());<br />}<br /></span><span style="color: #0000BB">$dbname </span><span style="color: #007700">= </span><span style="color: #DD0000">'mydb'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$db_selected </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #0000BB">$dbname</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$db_selected</span><span style="color: #007700">) {<br /> die(</span><span style="color: #DD0000">"Could not set </span><span style="color: #0000BB">$dbname</span><span style="color: #DD0000">: " </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">());<br />}<br /></span><span style="color: #0000BB">$res </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">'select * from users'</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #0000BB">mysql_field_name</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">mysql_field_name</span><span style="color: #007700">(</span><span style="color: #0000BB">$res</span><span style="color: #007700">, </span><span style="color: #0000BB">2</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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user_id
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password
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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-field-name-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数返回的字段名<em class="emphasis">大小写敏感</em>。</span></p></blockquote>
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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_fieldname()</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-field-name-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_field_type.html" class="function" rel="rdfs-seeAlso">mysql_field_type()</a> - 取得结果集中指定字段的类型</span></li>
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<li class="member"><span class="function"><a href="mysql_field_len.html" class="function" rel="rdfs-seeAlso">mysql_field_len()</a> - 返回指定字段的长度</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> |