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65 lines
4.7 KiB
HTML
65 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>返回上一个 MySQL 操作中的错误信息的数字编码</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-errno" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_errno</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_errno</span> — <span class="dc-title">
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返回上一个 MySQL 操作中的错误信息的数字编码
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</span></p>
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</div>
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<div class="refsect1 unknown-seealsp" id="refsect1-function.mysql-errno-unknown-seealsp">
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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_errno</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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返回上一个 MySQL 函数的错误号码，如果没有出错则返回
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<em>0</em>（零）。
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</p>
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<p class="para">
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从 MySQL 数据库后端来的错误不再发出警告，要用
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<span class="function"><strong>mysql_errno()</strong></span> 来提取错误代码。注意本函数仅返回最近一次
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MySQL 函数的执行（不包括 <span class="function"><a href="mysql_error.html" class="function">mysql_error()</a></span> 和
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<span class="function"><strong>mysql_errno()</strong></span>）的错误代码，因此如果要使用此函数，确保在调用另一个
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MySQL 函数之前检查它的值。
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</p>
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<p class="para">
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<div class="example" id="example-2127">
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<p><strong>Example #1 <span class="function"><strong>mysql_errno()</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">);<br /><br /> </span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">"nonexistentdb"</span><span style="color: #007700">);<br /> echo </span><span style="color: #0000BB">mysql_errno</span><span style="color: #007700">() . </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 /><br /> </span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">"kossu"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #DD0000">"SELECT * FROM nonexistenttable"</span><span style="color: #007700">);<br /> echo </span><span style="color: #0000BB">mysql_errno</span><span style="color: #007700">() . </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 /></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 class="example-contents"><p>
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以上例子将产生如下输出：
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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1049: Unknown database 'nonexistentdb'
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1146: Table 'kossu.nonexistenttable' doesn't exist
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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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如果指定了可选参数则用给定的连接提取错误代码。否则使用上一个打开的连接。
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</p>
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</p></blockquote>
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<p class="para">
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参见 <span class="function"><a href="mysql_error.html" class="function">mysql_error()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |