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24 KiB
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<!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，或数字数组，或二者兼有</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-array" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_fetch_array</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_fetch_array</span> — <span class="dc-title">
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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
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mysql-fetch-array-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_array</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$
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result_type
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</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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返回根据从结果集取得的行生成的数组，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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<span class="function"><strong>mysql_fetch_array()</strong></span> 是
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span>
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的扩展版本。除了将数据以数字索引方式储存在数组中之外，还可以将数据作为关联索引储存，用字段名作为键名。
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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，必须用该列的数字索引或给该列起个别名。对有别名的列，不能再用原来的列名访问其内容（本例中的
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<em>'field'</em>）。
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<div class="example" id="example-2130">
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<p><strong>Example #1 相同字段名的查询</strong></p>
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<div class="example-contents">
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<div class="sqlcode"><pre class="sqlcode">select table1.field as foo, table2.field as bar from table1, table2</pre>
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</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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有一点很重要必须指出，用
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<span class="function"><strong>mysql_fetch_array()</strong></span>
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并<em class="emphasis">不明显</em> 比用
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span>
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慢，而且还提供了明显更多的值。
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</p>
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<p class="para">
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<span class="function"><strong>mysql_fetch_array()</strong></span>
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中可选的第二个参数
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<code class="parameter">result_type</code>
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是一个常量，可以接受以下值：MYSQL_ASSOC，MYSQL_NUM
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和 MYSQL_BOTH。本特性是 PHP 3.0.7 起新加的。本参数的默认值是 MYSQL_BOTH。
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</p>
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<p class="para">
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如果用了 MYSQL_BOTH，将得到一个同时包含关联和数字索引的数组。用
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MYSQL_ASSOC 只得到关联索引（如同
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<span class="function"><a href="mysql_fetch_assoc.html" class="function">mysql_fetch_assoc()</a></span> 那样），用
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MYSQL_NUM 只得到数字索引（如同
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span> 那样）。
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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" id="example-2131">
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<p><strong>Example #2 mysql_fetch_array 使用 MYSQL_NUM</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">"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">) or<br /> 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 /> </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">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, name FROM mytable"</span><span style="color: #007700">);<br /><br /> while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">MYSQL_NUM</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"ID: %s Name: %s"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">], </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]);<br /> }<br /><br /> </span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></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-2132">
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<p><strong>Example #3 mysql_fetch_array 使用 MYSQL_ASSOC</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">"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">) or<br /> 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 /> </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">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, name FROM mytable"</span><span style="color: #007700">);<br /><br /> while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">MYSQL_ASSOC</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"ID: %s Name: %s"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"id"</span><span style="color: #007700">], </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"name"</span><span style="color: #007700">]);<br /> }<br /><br /> </span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></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-2133">
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<p><strong>Example #4 mysql_fetch_array 使用 MYSQL_BOTH</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">"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">) or<br /> 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 /> </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">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, name FROM mytable"</span><span style="color: #007700">);<br /><br /> while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">MYSQL_BOTH</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"ID: %s Name: %s"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">], </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"name"</span><span style="color: #007700">]);<br /> }<br /><br /> </span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></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
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span> 和
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<span class="function"><a href="mysql_fetch_assoc.html" class="function">mysql_fetch_assoc()</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-array-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">result_type</code></dt>
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<dd>
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<p class="para">
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The type of array that is to be fetched. It's a constant and can
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take the following values: <strong><code>MYSQL_ASSOC</code></strong>,
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<strong><code>MYSQL_NUM</code></strong>, and
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<strong><code>MYSQL_BOTH</code></strong>.
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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-array-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 array of strings that corresponds to the fetched row, or <strong><code>FALSE</code></strong>
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if there are no more rows. The type of returned array depends on
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how <code class="parameter">result_type</code> is defined. By using
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<strong><code>MYSQL_BOTH</code></strong> (default), you'll get an array with both
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associative and number indices. Using <strong><code>MYSQL_ASSOC</code></strong>, you
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only get associative indices (as <span class="function"><a href="mysql_fetch_assoc.html" class="function">mysql_fetch_assoc()</a></span>
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works), using <strong><code>MYSQL_NUM</code></strong>, you only get number indices
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(as <span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span> works).
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</p>
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<p class="para">
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If two or more columns of the result have the same field names,
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the last column will take precedence. To access the other column(s)
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of the same name, you must use the numeric index of the column or
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make an alias for the column. For aliased columns, you cannot
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access the contents with the original column name.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.mysql-fetch-array-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-2134">
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<p><strong>Example #5 Query with aliased duplicate field names</strong></p>
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<div class="example-contents">
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<div class="sqlcode"><pre class="sqlcode">SELECT table1.field AS foo, table2.field AS bar FROM table1, table2</pre>
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</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-2135">
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<p><strong>Example #6 <span class="function"><strong>mysql_fetch_array()</strong></span> with <strong><code>MYSQL_NUM</code></strong></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">"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">) or<br /> 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 /></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">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, name FROM mytable"</span><span style="color: #007700">);<br /><br />while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">MYSQL_NUM</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"ID: %s Name: %s"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">], </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">]); <br />}<br /><br /></span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></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-2136">
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<p><strong>Example #7 <span class="function"><strong>mysql_fetch_array()</strong></span> with <strong><code>MYSQL_ASSOC</code></strong></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">"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">) or<br /> 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 /></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">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, name FROM mytable"</span><span style="color: #007700">);<br /><br />while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">MYSQL_ASSOC</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf</span><span style="color: #007700">(</span><span style="color: #DD0000">"ID: %s Name: %s"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"id"</span><span style="color: #007700">], </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"name"</span><span style="color: #007700">]);<br />}<br /><br /></span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></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-2137">
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<p><strong>Example #8 <span class="function"><strong>mysql_fetch_array()</strong></span> with <strong><code>MYSQL_BOTH</code></strong></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">"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">) or<br /> 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 /></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">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT id, name FROM mytable"</span><span style="color: #007700">);<br /><br />while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">MYSQL_BOTH</span><span style="color: #007700">)) {<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"ID: %s Name: %s"</span><span style="color: #007700">, </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">], </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"name"</span><span style="color: #007700">]);<br />}<br /><br /></span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
|
||
</span>
|
||
</pre></div>
|
||
</div>
|
||
|
||
</div>
|
||
</p>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 notes" id="refsect1-function.mysql-fetch-array-notes">
|
||
<h3 class="title">注释</h3>
|
||
<blockquote class="note"><p><strong class="note">Note</strong>:
|
||
<strong>Performance</strong><br />
|
||
<p class="para">
|
||
An important thing to note is that using
|
||
<span class="function"><strong>mysql_fetch_array()</strong></span> is <em class="emphasis">not
|
||
significantly</em> slower than using
|
||
<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span>, while it provides
|
||
a significant added value.
|
||
</p>
|
||
</p></blockquote>
|
||
<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>
|
||
<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>
|
||
</div>
|
||
|
||
|
||
<div class="refsect1 seealso" id="refsect1-function.mysql-fetch-array-seealso">
|
||
<h3 class="title">参见</h3>
|
||
<p class="para">
|
||
<ul class="simplelist">
|
||
<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>
|
||
<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>
|
||
<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>
|
||
<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>
|
||
</ul>
|
||
</p>
|
||
</div>
|
||
|
||
</div></div></div></body></html> |