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58 lines
4.7 KiB
HTML
58 lines
4.7 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>取得结果集中行的数目</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-num-rows" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_num_rows</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_num_rows</span> — <span class="dc-title">取得结果集中行的数目</span></p>
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</div>
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<div class="refsect1 unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-seealta" id="refsect1-function.mysql-num-rows-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-unknown-seealta">
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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_num_rows</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>mysql_num_rows()</strong></span>
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返回结果集中行的数目。此命令仅对
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SELECT 语句有效。要取得被
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INSERT，UPDATE 或者
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DELETE 查询所影响到的行的数目，用
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<span class="function"><a href="mysql_affected_rows.html" class="function">mysql_affected_rows()</a></span>。
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<div class="example" id="example-2160">
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<p><strong>Example #1 <span class="function"><strong>mysql_num_rows()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br />$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">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">"database"</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT * FROM table1"</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$num_rows </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br />echo </span><span style="color: #DD0000">"</span><span style="color: #0000BB">$num_rows</span><span style="color: #DD0000"> Rows\n"</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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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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如果使用
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<span class="function"><a href="mysql_unbuffered_query.html" class="function">mysql_unbuffered_query()</a></span>，则直到结果集中的所有行都被提取后
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<span class="function"><strong>mysql_num_rows()</strong></span>
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才能返回正确的值。
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</p>
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</p></blockquote>
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<p class="para">
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参见
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<span class="function"><a href="mysql_affected_rows.html" class="function">mysql_affected_rows()</a></span>，<span class="function"><a href="mysql_connect.html" class="function">mysql_connect()</a></span>，<span class="function"><a href="mysql_data_seek.html" class="function">mysql_data_seek()</a></span>，<span class="function"><a href="mysql_select_db.html" class="function">mysql_select_db()</a></span> 和
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<span class="function"><a href="mysql_query.html" class="function">mysql_query()</a></span>。
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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
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<span class="function"><strong>mysql_numrows()</strong></span>，但反对这样做。
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</p>
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</div>
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</div></div></div></body></html> |