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134 lines
7.8 KiB
HTML
134 lines
7.8 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>打开一个持久的 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-pconnect" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">pg_pconnect</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">pg_pconnect</span> — <span class="dc-title">打开一个持久的 PostgreSQL 连接</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.pg-pconnect-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>pg_pconnect</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$connection_string</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$connect_type</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_pconnect()</strong></span> 打开一个到 PostgreSQL 数据库的持久连接。返回其它 PostgreSQL 函数所需要的连接资源号。
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</p>
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<p class="para">
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If a second call is made to <span class="function"><strong>pg_pconnect()</strong></span> with
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the same <code class="parameter">connection_string</code> as an existing connection, the
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existing connection will be returned unless you pass
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<strong><code>PGSQL_CONNECT_FORCE_NEW</code></strong> as
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<code class="parameter">connect_type</code>.
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</p>
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<p class="para">
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要打开持久连接功能，<var class="filename">php.ini</var> 中的 <a href="pgsql.configuration.html#ini.pgsql.allow-persistent" class="link">pgsql.allow_persistent</a> 参数必须为 "On"（也是默认值）。
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最大持久连接数目由 <var class="filename">php.ini</var> 中的 <a href="pgsql.configuration.html#ini.pgsql.max-persistent" class="link">pgsql.max_persistent</a>
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参数定义（默认为 -1 表示没有限制）。所有连接的数目可由 <var class="filename">php.ini</var> 中的 <a href="pgsql.configuration.html#ini.pgsql.max-links" class="link">pgsql.max_links</a> 参数设置。
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</p>
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<p class="para">
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<span class="function"><a href="pg_close.html" class="function">pg_close()</a></span> 不能关闭由 <span class="function"><strong>pg_pconnect()</strong></span> 打开的持久连接。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.pg-pconnect-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">connection_string</code></dt>
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<dd>
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<p class="para">
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The <code class="parameter">connection_string</code> can be empty to use all default parameters, or it
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can contain one or more parameter settings separated by whitespace.
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Each parameter setting is in the form <em>keyword = value</em>. Spaces around
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the equal sign are optional. To write an empty value or a value
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containing spaces, surround it with single quotes, e.g., <em>keyword =
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'a value'</em>. Single quotes and backslashes within the value must be
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escaped with a backslash, i.e., \' and \.
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</p>
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<p class="para">
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The currently recognized parameter keywords are:
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<code class="parameter">host</code>, <code class="parameter">hostaddr</code>, <code class="parameter">port</code>,
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<code class="parameter">dbname</code>, <code class="parameter">user</code>,
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<code class="parameter">password</code>, <code class="parameter">connect_timeout</code>,
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<code class="parameter">options</code>, <code class="parameter">tty</code> (ignored), <code class="parameter">sslmode</code>,
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<code class="parameter">requiressl</code> (deprecated in favor of <code class="parameter">sslmode</code>), and
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<code class="parameter">service</code>. Which of these arguments exist depends
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on your PostgreSQL version.
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</p>
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</dd>
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<dt>
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<code class="parameter">connect_type</code></dt>
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<dd>
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<p class="para">
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If <strong><code>PGSQL_CONNECT_FORCE_NEW</code></strong> is passed, then a new connection
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is created, even if the <code class="parameter">connection_string</code> is identical to
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an existing connection.
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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.pg-pconnect-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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PostgreSQL connection resource on success, <strong><code>FALSE</code></strong> on failure.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.pg-pconnect-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-2508">
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<p><strong>Example #1 Using <span class="function"><strong>pg_pconnect()</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 />$dbconn </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">"dbname=mary"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//connect to a database named "mary"<br /><br /></span><span style="color: #0000BB">$dbconn2 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_pconnect</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 /><br /></span><span style="color: #0000BB">$dbconn3 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">"host=sheep port=5432 dbname=mary user=lamb password=foo"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">//connect to a database named "mary" on the host "sheep" with a username and password<br /><br /></span><span style="color: #0000BB">$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">$dbconn4 </span><span style="color: #007700">= </span><span style="color: #0000BB">pg_pconnect</span><span style="color: #007700">(</span><span style="color: #0000BB">$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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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.pg-pconnect-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="pg_connect.html" class="function" rel="rdfs-seeAlso">pg_connect()</a> - 打开一个 PostgreSQL 连接</span></li>
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<li class="member">
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<a href="features.persistent_connections.html" class="link">持久数据库连接</a>
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</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> |