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76 lines
4.8 KiB
HTML
76 lines
4.8 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>取得上一步 INSERT 操作产生的 ID</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-insert-id" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_insert_id</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_insert_id</span> — <span class="dc-title">
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取得上一步 INSERT 操作产生的 ID
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</span></p>
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</div>
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<div class="refsect1 unknown-unknown-unknown-unknown-unknown-unknown-seealsu" id="refsect1-function.mysql-insert-id-unknown-unknown-unknown-unknown-unknown-unknown-seealsu">
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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_insert_id</strong></span>
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([ <span class="methodparam"><span class="type">resource</span> <code class="parameter">$link_identifier</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_insert_id()</strong></span>
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返回给定的
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<code class="parameter">link_identifier</code>
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中上一步 INSERT 查询中产生的 AUTO_INCREMENT 的 ID 号。如果没有指定
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<code class="parameter">link_identifier</code>，则使用上一个打开的连接。
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</p>
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<p class="para">
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如果上一查询没有产生
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AUTO_INCREMENT 的值，则
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<span class="function"><strong>mysql_insert_id()</strong></span>
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返回 0。如果需要保存该值以后使用，要确保在产生了值的查询之后立即调用
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<span class="function"><strong>mysql_insert_id()</strong></span>。
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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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MySQL 中的 SQL 函数
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<em>LAST_INSERT_ID()</em>
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总是保存着最新产生的
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AUTO_INCREMENT 值，并且不会在查询语句之间被重置。
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</p>
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</p></blockquote>
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<div class="warning"><strong class="warning">Warning</strong>
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<p class="para">
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<span class="function"><strong>mysql_insert_id()</strong></span> 将
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MySQL 内部的 C API 函数
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<em>mysql_insert_id()</em>
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的返回值转换成
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<em>long</em>（PHP 中命名为 <span class="type"><a href="language.types.integer.html" class="type int">int</a></span>）。如果
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AUTO_INCREMENT 的列的类型是 BIGINT，则
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<span class="function"><strong>mysql_insert_id()</strong></span>
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返回的值将不正确。可以在 SQL 查询中用
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MySQL 内部的 SQL 函数
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<em>LAST_INSERT_ID()</em> 来替代。
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</p>
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</div>
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<p class="para">
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<div class="example" id="example-2155">
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<p><strong>Example #1 <span class="function"><strong>mysql_insert_id()</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 /> 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">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"INSERT INTO mytable (product) values ('kossu')"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">printf </span><span style="color: #007700">(</span><span style="color: #DD0000">"Last inserted record has id %d\n"</span><span style="color: #007700">, </span><span style="color: #0000BB">mysql_insert_id</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 <span class="function"><a href="mysql_query.html" class="function">mysql_query()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |