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211 lines
14 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>从结果集中取得一行作为对象</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-fetch-object" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_fetch_object</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_fetch_object</span> — <span class="dc-title">从结果集中取得一行作为对象</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mysql-fetch-object-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_fetch_object</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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) : <span class="type">object</span></div>
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<p class="para rdfs-comment">
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返回根据所取得的行生成的对象，如果没有更多行则返回 <strong><code>FALSE</code></strong>。
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</p>
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<p class="para">
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<span class="function"><strong>mysql_fetch_object()</strong></span> 和
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<span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span>
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类似，只有一点区别 - 返回一个对象而不是数组。间接地也意味着只能通过字段名来访问数组，而不是偏移量（数字是合法的属性名）。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数返回的字段名<em class="emphasis">大小写敏感</em>。</span></p></blockquote>
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<p class="para">
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">/* this is valid */<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">-></span><span style="color: #0000BB">field</span><span style="color: #007700">;<br /></span><span style="color: #FF8000">/* this is invalid */<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">-></span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</p>
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<p class="para">
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速度上，本函数和
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<span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span> 一样，也几乎和
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span> 一样快（差别很不明显）。
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<div class="example" id="example-2141">
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<p><strong>Example #1 <span class="function"><strong>mysql_fetch_object()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"hostname"</span><span style="color: #007700">, </span><span style="color: #DD0000">"user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"password"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">"mydb"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"select * from mytable"</span><span style="color: #007700">);<br />while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_object</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">-></span><span style="color: #0000BB">user_id</span><span style="color: #007700">;<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">-></span><span style="color: #0000BB">fullname</span><span style="color: #007700">;<br />}<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 /></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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<p class="para">
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参见 <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_row.html" class="function">mysql_fetch_row()</a></span>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mysql-fetch-object-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">class_name</code></dt>
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<dd>
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<p class="para">
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The name of the class to instantiate, set the properties of and return.
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If not specified, a <strong class="classname">stdClass</strong> object is returned.
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</p>
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</dd>
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<dt>
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<code class="parameter">params</code></dt>
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<dd>
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<p class="para">
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An optional <span class="type"><a href="language.types.array.html" class="type array">array</a></span> of parameters to pass to the constructor
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for <code class="parameter">class_name</code> objects.
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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.mysql-fetch-object-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns an <span class="type"><a href="language.types.object.html" class="type object">object</a></span> with string properties that correspond to the
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fetched row, or <strong><code>FALSE</code></strong> if there are no more rows.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.mysql-fetch-object-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.0.0</td>
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<td>
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Added the ability to return as a different object.
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.mysql-fetch-object-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-2142">
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<p><strong>Example #2 <span class="function"><strong>mysql_fetch_object()</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 />mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"hostname"</span><span style="color: #007700">, </span><span style="color: #DD0000">"user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"password"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">"mydb"</span><span style="color: #007700">);<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 * from mytable"</span><span style="color: #007700">);<br />while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_object</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">-></span><span style="color: #0000BB">user_id</span><span style="color: #007700">;<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">-></span><span style="color: #0000BB">fullname</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-2143">
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<p><strong>Example #3 <span class="function"><strong>mysql_fetch_object()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">class </span><span style="color: #0000BB">foo </span><span style="color: #007700">{<br /> public </span><span style="color: #0000BB">$name</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"hostname"</span><span style="color: #007700">, </span><span style="color: #DD0000">"user"</span><span style="color: #007700">, </span><span style="color: #DD0000">"password"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">"mydb"</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"select name from mytable limit 1"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$obj </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_object</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #DD0000">'foo'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$obj</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-fetch-object-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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<strong>Performance</strong><br />
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<p class="para">
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Speed-wise, the function is identical to
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<span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span>, and almost as quick as
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span> (the difference is
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insignificant).
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</p>
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</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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<span class="function"><strong>mysql_fetch_object()</strong></span> is similar to
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<span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span>, with one difference - an
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object is returned, instead of an array. Indirectly, that means
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that you can only access the data by the field names, and not by
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their offsets (numbers are illegal property names).
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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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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数将 NULL 字段设置为 PHP <strong><code>NULL</code></strong> 值。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.mysql-fetch-object-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_fetch_array.html" class="function" rel="rdfs-seeAlso">mysql_fetch_array()</a> - 从结果集中取得一行作为关联数组，或数字数组，或二者兼有</span></li>
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<li class="member"><span class="function"><a href="mysql_fetch_assoc.html" class="function" rel="rdfs-seeAlso">mysql_fetch_assoc()</a> - 从结果集中取得一行作为关联数组</span></li>
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<li class="member"><span class="function"><a href="mysql_fetch_row.html" class="function" rel="rdfs-seeAlso">mysql_fetch_row()</a> - 从结果集中取得一行作为枚举数组</span></li>
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<li class="member"><span class="function"><a href="mysql_data_seek.html" class="function" rel="rdfs-seeAlso">mysql_data_seek()</a> - 移动内部结果的指针</span></li>
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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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</ul>
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</p>
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</div>
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</div></div></div></body></html> |