📄 function.pg-pconnect.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Open a persistent PostgreSQL connection</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-parameter-status.html">pg_parameter_status</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-ping.html">pg_ping</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.pg-pconnect" class="refentry"> <div class="refnamediv"> <h1 class="refname">pg_pconnect</h1> <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">pg_pconnect</span> — <span class="dc-title">Open a persistent PostgreSQL connection</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">resource</span> <span class="methodname"><b><b>pg_pconnect</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$connection_string</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$connect_type</tt></span> ] )</div> <p class="para rdfs-comment"> <b>pg_pconnect()</b> opens a connection to a PostgreSQL database. It returns a connection resource that is needed by other PostgreSQL functions. </p> <p class="para"> If a second call is made to <b>pg_pconnect()</b> with the same <i><tt class="parameter">connection_string</tt></i> as an existing connection, the existing connection will be returned unless you pass <b><tt>PGSQL_CONNECT_FORCE_NEW</tt></b> as <i><tt class="parameter">connect_type</tt></i>. </p> <p class="para"> To enable persistent connection, the <a href="pgsql.configuration.html#ini.pgsql.allow-persistent" class="link">pgsql.allow_persistent</a> <var class="filename">php.ini</var> directive must be set to "On" (which is the default). The maximum number of persistent connection can be defined with the <a href="pgsql.configuration.html#ini.pgsql.max-persistent" class="link">pgsql.max_persistent</a> <var class="filename">php.ini</var> directive (defaults to -1 for no limit). The total number of connections can be set with the <a href="pgsql.configuration.html#ini.pgsql.max-links" class="link">pgsql.max_links</a> <var class="filename">php.ini</var> directive. </p> <p class="para"> <a href="function.pg-close.html" class="function">pg_close()</a> will not close persistent links generated by <b>pg_pconnect()</b>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">connection_string</tt></i></span> <dd> <p class="para"> The <i><tt class="parameter">connection_string</tt></i> can be empty to use all default parameters, or it can contain one or more parameter settings separated by whitespace. Each parameter setting is in the form <i>keyword = value</i>. Spaces around the equal sign are optional. To write an empty value or a value containing spaces, surround it with single quotes, e.g., <i>keyword = 'a value'</i>. Single quotes and backslashes within the value must be escaped with a backslash, i.e., \' and \\. </p> <p class="para"> The currently recognized parameter keywords are: <i><tt class="parameter">host</tt></i>, <i><tt class="parameter">hostaddr</tt></i>, <i><tt class="parameter">port</tt></i>, <i><tt class="parameter">dbname</tt></i>, <i><tt class="parameter">user</tt></i>, <i><tt class="parameter">password</tt></i>, <i><tt class="parameter">connect_timeout</tt></i>, <i><tt class="parameter">options</tt></i>, <i><tt class="parameter">tty</tt></i> (ignored), <i><tt class="parameter">sslmode</tt></i>, <i><tt class="parameter">requiressl</tt></i> (deprecated in favor of <i><tt class="parameter">sslmode</tt></i>), and <i><tt class="parameter">service</tt></i>. Which of these arguments exist depends on your PostgreSQL version. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">connect_type</tt></i></span> <dd> <p class="para"> If <b><tt>PGSQL_CONNECT_FORCE_NEW</tt></b> is passed, then a new connection is created, even if the <i><tt class="parameter">connection_string</tt></i> is identical to an existing connection. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> PostgreSQL connection resource on success, <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 Using <b>pg_pconnect()</b></b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><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></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.pg-connect.html" class="function" rel="rdfs-seeAlso">pg_connect()</a></li> <li class="member"> <a href="features.persistent-connections.html" class="link"> Persistent Database Connections</a> </li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.pg-parameter-status.html">pg_parameter_status</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.pg-ping.html">pg_ping</a></div> <div class="up"><a href="ref.pgsql.html">PostgreSQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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