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HTML
143 lines
8.4 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>选择 MySQL 数据库</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-select-db" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">mysql_select_db</h1>
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<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_select_db</span> — <span class="dc-title">选择 MySQL 数据库</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.mysql-select-db-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_select_db</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$database_name</code></span>
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[, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$
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link_identifier
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</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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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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<p class="para">
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<span class="function"><strong>mysql_select_db()</strong></span>
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设定与指定的连接标识符所关联的服务器上的当前激活数据库。如果没有指定连接标识符，则使用上一个打开的连接。如果没有打开的连接，本函数将无参数调用
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<span class="function"><a href="mysql_connect.html" class="function">mysql_connect()</a></span> 来尝试打开一个并使用之。
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</p>
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<p class="para">
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每个其后的
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<span class="function"><a href="mysql_query.html" class="function">mysql_query()</a></span>
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调用都会作用于活动数据库。
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</p>
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<p class="para">
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<div class="example" id="example-2167">
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<p><strong>Example #1 <span class="function"><strong>mysql_select_db()</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 />$lnk </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_user'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_password'</span><span style="color: #007700">)<br /> or die (</span><span style="color: #DD0000">'Not connected : ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">());<br /><br /></span><span style="color: #FF8000">// make foo the current db<br /></span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #0000BB">$lnk</span><span style="color: #007700">) or die (</span><span style="color: #DD0000">'Can\'t use foo : ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</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="mysql_connect.html" class="function">mysql_connect()</a></span>，<span class="function"><a href="mysql_pconnect.html" class="function">mysql_pconnect()</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_selectdb()</strong></span>，但反对这样做。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.mysql-select-db-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">database_name</code></dt>
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<dd>
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<p class="para">
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The name of the database that is to be selected.
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</p>
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</dd>
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<dt>
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<code class="parameter">
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link_identifier</code></dt>
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<dd>
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<p class="para">MySQL
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连接。如不指定连接标识，则使用由 <span class="function"><a href="mysql_connect.html" class="function">mysql_connect()</a></span>
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最近打开的连接。如果没有找到该连接，会尝试不带参数调用
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<span class="function"><a href="mysql_connect.html" class="function">mysql_connect()</a></span>
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来创建。如没有找到连接或无法建立连接，则会生成
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<strong><code>E_WARNING</code></strong> 级别的错误。</p></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-select-db-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-select-db-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-2168">
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<p><strong>Example #2 <span class="function"><strong>mysql_select_db()</strong></span> example</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 />$link </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">'localhost'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_user'</span><span style="color: #007700">, </span><span style="color: #DD0000">'mysql_password'</span><span style="color: #007700">);<br />if (!</span><span style="color: #0000BB">$link</span><span style="color: #007700">) {<br /> die(</span><span style="color: #DD0000">'Not connected : ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">());<br />}<br /><br /></span><span style="color: #FF8000">// make foo the current db<br /></span><span style="color: #0000BB">$db_selected </span><span style="color: #007700">= </span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">'foo'</span><span style="color: #007700">, </span><span style="color: #0000BB">$link</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">'Can\'t use foo : ' </span><span style="color: #007700">. </span><span style="color: #0000BB">mysql_error</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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</div>
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<div class="refsect1 notes" id="refsect1-function.mysql-select-db-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">
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为了向下兼容，可以使用下列已废弃的别名：
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<span class="function"><strong>mysql_selectdb()</strong></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-select-db-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_connect.html" class="function" rel="rdfs-seeAlso">mysql_connect()</a> - 打开一个到 MySQL 服务器的连接</span></li>
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<li class="member"><span class="function"><a href="mysql_pconnect.html" class="function" rel="rdfs-seeAlso">mysql_pconnect()</a> - 打开一个到 MySQL 服务器的持久连接</span></li>
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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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</ul>
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</p>
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</div>
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</div></div></div></body></html> |