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56 lines
5.6 KiB
HTML
56 lines
5.6 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>打开一个 PostgreSQL 连接</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.pg-connect" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_connect</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_connect</span> — <span class="dc-title">打开一个 PostgreSQL 连接</span></p>
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</div>
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<div class="refsect1 unknown-returnvaluet" id="refsect1-function.pg-connect-unknown-returnvaluet">
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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>pg_connect</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$connection_string</code></span>
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) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>pg_connect()</strong></span> 返回其它 PostgreSQL 函数所需要的资源。
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</p>
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<p class="para">
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<span class="function"><strong>pg_connect()</strong></span> 打开一个由
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<code class="parameter">connection_string</code> 所指定的
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PostgreSQL 数据库的连接。如果成功则返回连接资源，如果不能连接则返回
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<strong><code>FALSE</code></strong>。<code class="parameter">connection_string</code> 应该是用引号引起来的字符串。
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<div class="example" id="example-2474">
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<p><strong>Example #1 使用 <span class="function"><strong>pg_connect()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$dbconn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=mary"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//connect to a database named "mary"<br /></span><span style="color: #0000BB">$dbconn2 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"host=localhost port=5432 dbname=mary"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// connect to a database named "mary" on "localhost" at port "5432"<br /></span><span style="color: #0000BB">$dbconn3 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"host=sheep port=5432 dbname=mary user=lamb password=foo"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//connect to a database named "mary" on the host "sheep" with a username and password<br /><br /></span><span style="color: #0000BB">$conn_string </span><span style="color: #007700">= </span><span style="color: #DD0000">"host=sheep port=5432 dbname=test user=lamb password=bar"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$dbconn4 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_connect</span><span style="color: #007700">(</span><span style="color: #0000BB">$conn_string</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//connect to a database named "test" on the host "sheep" with a username and password<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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<code class="parameter">connection_string</code> 所包括的参数有
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<code class="parameter">host</code>，<code class="parameter">port</code>，<code class="parameter">tty</code>, <code class="parameter">options</code>，<code class="parameter">dbname</code>, <code class="parameter">user</code>
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和 <code class="parameter">password</code>。
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</p>
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<p class="para">
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如果用同样的 <code class="parameter">connection_string</code> 再次调用
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<span class="function"><strong>pg_connect()</strong></span>，不会建立新连接，而是返回前面已经打开的连接资源。如果使用不同的连接字符串，则可以和同一个数据库建立多个连接。
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</p>
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<p class="para">
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旧的多参数语法 <strong class="command">$conn = pg_connect("host", "port", "options", "tty", "dbname")</strong> 已经不提倡使用。
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</p>
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<p class="para">
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参见 <span class="function"><a href="pg_pconnect.html" class="function">pg_pconnect()</a></span>，<span class="function"><a href="pg_close.html" class="function">pg_close()</a></span>，<span class="function"><a href="pg_host.html" class="function">pg_host()</a></span>，<span class="function"><a href="pg_port.html" class="function">pg_port()</a></span>, <span class="function"><a href="pg_tty.html" class="function">pg_tty()</a></span>，<span class="function"><a href="pg_options.html" class="function">pg_options()</a></span>
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和 <span class="function"><a href="pg_dbname.html" class="function">pg_dbname()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |