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59 lines
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HTML
59 lines
5.3 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>提取一行作为关联数组</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.pg-fetch-assoc" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_fetch_assoc</h1>
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<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_fetch_assoc</span> — <span class="dc-title">提取一行作为关联数组</span></p>
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</div>
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<div class="refsect1 unknown-unknown-unknown-seealsr" id="refsect1-function.pg-fetch-assoc-unknown-unknown-unknown-seealsr">
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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>pg_fetch_assoc</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$row</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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<span class="function"><strong>pg_fetch_assoc()</strong></span> 和调用 <span class="function"><a href="pg_fetch_array.html" class="function">pg_fetch_array()</a></span>
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加上第三个可选参数 PGSQL_ASSOC 是等价的。它只返回一个关联数组。如果需要数字索引，用
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<span class="function"><a href="pg_fetch_row.html" class="function">pg_fetch_row()</a></span>。
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</p>
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<p class="para">
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<span class="function"><strong>pg_fetch_assoc()</strong></span> 是
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<span class="function"><a href="pg_fetch_row.html" class="function">pg_fetch_row()</a></span>
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的扩展版本。除了将数据存储在数字索引（字段编号）之外，默认还将数组存储在关联索引（字段名）中。
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</p>
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<p class="para">
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<code class="parameter">row</code> 是要被提取的行（记录）编号。第一行为 0。
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</p>
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<p class="para">
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<span class="function"><strong>pg_fetch_assoc()</strong></span> 并不明显比
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<span class="function"><a href="pg_fetch_row.html" class="function">pg_fetch_row()</a></span>
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慢，而且还显著更便于使用。
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</p>
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<p class="para">
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<div class="example" id="example-2490">
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<p><strong>Example #1 <span class="function"><strong>pg_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 />$conn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=publisher"</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$conn</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"An error occured.\n"</span><span style="color: #007700">;<br /> exit;<br />}<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">, </span><span style="color: #DD0000">"SELECT id, author, email FROM authors"</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"An error occured.\n"</span><span style="color: #007700">;<br /> exit;<br />}<br />while (</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_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">'id'</span><span style="color: #007700">];<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">'author'</span><span style="color: #007700">];<br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">'email'</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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<p class="para">
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参见
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<span class="function"><a href="pg_fetch_row.html" class="function">pg_fetch_row()</a></span>，<span class="function"><a href="pg_fetch_array.html" class="function">pg_fetch_array()</a></span>，<span class="function"><a href="pg_fetch_object.html" class="function">pg_fetch_object()</a></span> 和
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<span class="function"><a href="pg_fetch_result.html" class="function">pg_fetch_result()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |