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130 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>移动内部结果的指针</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-data-seek" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_data_seek</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_data_seek</span> — <span class="dc-title">移动内部结果的指针</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mysql-data-seek-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_data_seek</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_number</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>mysql_data_seek()</strong></span> 将指定的结果标识所关联的
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MySQL 结果内部的行指针移动到指定的行号。接着调用
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<span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span> 将返回那一行。
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</p>
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<p class="para">
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<code class="parameter">row_number</code> 从 0 开始。<code class="parameter">row_number</code>
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的取值范围应该从 0 到 mysql_num_rows - 1。但是如果结果集为空（<span class="function"><a href="mysql_num_rows.html" class="function">mysql_num_rows()</a></span>
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== 0），要将指针移动到 0 会失败并发出 <a href="" class="link">E_WARNING</a>
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级的错误，<span class="function"><strong>mysql_data_seek()</strong></span> 将返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mysql-data-seek-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">row_number</code></dt>
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<dd>
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<p class="para">
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想要设定的新的结果集指针的行数。
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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-data-seek-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.mysql-data-seek-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-2124">
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<p><strong>Example #1 <span class="function"><strong>mysql_data_seek()</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 />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_user'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_password'</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$link</span><span style="color: #007700">) {<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 />}<br /></span><span style="color: #0000BB">$db_selected </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">'sample_db'</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$db_selected</span><span style="color: #007700">) {<br /> die(</span><span style="color: #DD0000">'Could not select database: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">());<br />}<br /></span><span style="color: #0000BB">$query </span><span style="color: #007700">= </span><span style="color: #DD0000">'SELECT last_name, first_name FROM friends'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$query</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> die(</span><span style="color: #DD0000">'Query failed: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">());<br />}<br /></span><span style="color: #FF8000">/* fetch rows in reverse order */<br /></span><span style="color: #007700">for (</span><span style="color: #0000BB">$i </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">) - </span><span style="color: #0000BB">1</span><span style="color: #007700">; </span><span style="color: #0000BB">$i </span><span style="color: #007700">>= </span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$i</span><span style="color: #007700">--) {<br /> if (!</span><span style="color: #0000BB">mysql_data_seek</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">, </span><span style="color: #0000BB">$i</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Cannot seek to row </span><span style="color: #0000BB">$i</span><span style="color: #DD0000">: " </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">() . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /> continue;<br /> }<br /><br /> if (!(</span><span style="color: #0000BB">$row </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_fetch_assoc</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">))) {<br /> continue;<br /> }<br /><br /> echo </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">'last_name'</span><span style="color: #007700">] . </span><span style="color: #DD0000">' ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">'first_name'</span><span style="color: #007700">] . </span><span style="color: #DD0000">"<br />\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$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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</div>
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<div class="refsect1 notes" id="refsect1-function.mysql-data-seek-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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<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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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="mysqli_result.data_seek.html" class="function">mysqli_data_seek()</a></span></li>
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<li class="member"><strong><code>PDO::FETCH_ORI_ABS</code></strong></li>
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</ul>
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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_data_seek()</strong></span> 只能和
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<span class="function"><a href="mysql_query.html" class="function">mysql_query()</a></span> 结合起来使用，而不能用于
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<span class="function"><a href="mysql_unbuffered_query.html" class="function">mysql_unbuffered_query()</a></span>。
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</p>
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</p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.mysql-data-seek-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_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_num_rows.html" class="function" rel="rdfs-seeAlso">mysql_num_rows()</a> - 取得结果集中行的数目</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_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_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_object.html" class="function" rel="rdfs-seeAlso">mysql_fetch_object()</a> - 从结果集中取得一行作为对象</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> |