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127 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>从结果集中取得一行作为关联数组</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-assoc" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_fetch_assoc</h1>
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<p class="verinfo">(PHP 4 >= 4.0.3, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_fetch_assoc</span> — <span class="dc-title">
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从结果集中取得一行作为关联数组
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</span></p>
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</div>
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<div id="function.mysql-fetch-assoc-refsynopsisdiv">
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="para">本扩展自 PHP 5.5.0
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起已废弃，并在自 PHP 7.0.0 开始被移除。应使用 <a href="book.mysqli.html" class="link">MySQLi</a>
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或 <a href="ref.pdo_mysql.html" class="link">PDO_MySQL</a> 扩展来替换之。参见
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<a href="mysqlinfo.api.choosing.html" class="link">MySQL：选择 API</a> 指南以及<a href="faq.databases.html#faq.databases.mysql.deprecated" class="link">相关 FAQ</a> 来获取更多信息。用以替代本函数的有：</p>
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="mysqli_result.fetch_assoc.html" class="function">mysqli_fetch_assoc()</a></span></li>
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<li class="member"><span class="methodname"><a href="pdostatement.fetch.html" class="methodname">PDOStatement::fetch(PDO::FETCH_ASSOC)</a></span></li>
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</ul>
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</div>
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</div>
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<div class="refsect1 description" id="refsect1-function.mysql-fetch-assoc-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_assoc</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">array</span></div>
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<p class="para rdfs-comment">
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返回对应结果集的关联数组，并且继续移动内部数据指针。
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<span class="function"><strong>mysql_fetch_assoc()</strong></span> 和用
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<span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span> 加上第二个可选参数
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MYSQL_ASSOC 完全相同。它仅仅返回关联数组。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mysql-fetch-assoc-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-fetch-assoc-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回根据从结果集取得的行生成的关联数组；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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如果结果中的两个或以上的列具有相同字段名，最后一列将优先。要访问同名的其它列，要么用
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span>
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来取得数字索引或给该列起个别名。
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参见
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<span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span> 例子中有关别名说明。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.mysql-fetch-assoc-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-2138">
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<p><strong>Example #1 扩展的 <span class="function"><strong>mysql_fetch_assoc()</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 /><br />$conn </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 /><br />if (!</span><span style="color: #0000BB">$conn</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Unable to connect to DB: " </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br /> exit;<br />}<br /> <br />if (!</span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">"mydbname"</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Unable to select mydbname: " </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br /> exit;<br />}<br /><br /></span><span style="color: #0000BB">$sql </span><span style="color: #007700">= </span><span style="color: #DD0000">"SELECT id as userid, fullname, userstatus <br /> FROM sometable<br /> WHERE userstatus = 1"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$sql</span><span style="color: #007700">);<br /><br />if (!</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"Could not successfully run query (</span><span style="color: #0000BB">$sql</span><span style="color: #DD0000">) from DB: " </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br /> exit;<br />}<br /><br />if (</span><span style="color: #0000BB">mysql_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">) == </span><span style="color: #0000BB">0</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"No rows found, nothing to print so am exiting"</span><span style="color: #007700">;<br /> exit;<br />}<br /><br /></span><span style="color: #FF8000">// While a row of data exists, put that row in $row as an associative array<br />// Note: If you're expecting just one row, no need to use a loop<br />// Note: If you put extract($row); inside the following loop, you'll<br />// then create $userid, $fullname, and $userstatus<br /></span><span style="color: #007700">while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_assoc</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"userid"</span><span style="color: #007700">];<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"fullname"</span><span style="color: #007700">];<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"userstatus"</span><span style="color: #007700">];<br />}<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 /><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-assoc-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>性能</strong><br />
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<p class="para">
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必须指出一个要点：
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<span class="function"><strong>mysql_fetch_assoc()</strong></span> 比
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span>
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并<em class="emphasis">不明显</em>
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慢，而且还提供了更多有用的值。
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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-assoc-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_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_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_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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<li class="member"><span class="function"><a href="mysql_error.html" class="function" rel="rdfs-seeAlso">mysql_error()</a> - 返回上一个 MySQL 操作产生的文本错误信息</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> |