📄 function.mysql-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 connection to a MySQL server</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.mysql-num-rows.html">mysql_num_rows</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mysql-ping.html">mysql_ping</a></div> <div class="up"><a href="ref.mysql.html">MySQL Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.mysql-pconnect" class="refentry"> <div class="refnamediv"> <h1 class="refname">mysql_pconnect</h1> <p class="verinfo">(PHP 4, PHP 5, PECL mysql:1.0)</p><p class="refpurpose"><span class="refname">mysql_pconnect</span> — <span class="dc-title">Open a persistent connection to a MySQL server</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>mysql_pconnect</b></b></span> ([ <span class="methodparam"><span class="type">string</span> <tt class="parameter">$server</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$username</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$password</tt></span> [, <span class="methodparam"><span class="type">int</span> <tt class="parameter">$client_flags</tt></span> ]]]] )</div> <p class="para rdfs-comment"> Establishes a persistent connection to a MySQL server. </p> <p class="para"> <b>mysql_pconnect()</b> acts very much like <a href="function.mysql-connect.html" class="function">mysql_connect()</a> with two major differences. </p> <p class="para"> First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection. </p> <p class="para"> Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (<a href="function.mysql-close.html" class="function">mysql_close()</a> will not close links established by <b>mysql_pconnect()</b>). </p> <p class="para"> This type of link is therefore called 'persistent'. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">server</tt></i></span> <dd> <p class="para"> The MySQL server. It can also include a port number. e.g. "hostname:port" or a path to a local socket e.g. ":/path/to/socket" for the localhost. </p> <p class="para"> If the PHP directive <a href="mysql.configuration.html#ini.mysql.default-host" class="link"> mysql.default_host</a> is undefined (default), then the default value is 'localhost:3306' </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">username</tt></i></span> <dd> <p class="para"> The username. Default value is the name of the user that owns the server process. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">password</tt></i></span> <dd> <p class="para"> The password. Default value is an empty password. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">client_flags</tt></i></span> <dd> <p class="para"> The <i><tt class="parameter">client_flags</tt></i> parameter can be a combination of the following constants: 128 (enable <i>LOAD DATA LOCAL</i> handling), <b><tt>MYSQL_CLIENT_SSL</tt></b>, <b><tt>MYSQL_CLIENT_COMPRESS</tt></b>, <b><tt>MYSQL_CLIENT_IGNORE_SPACE</tt></b> or <b><tt>MYSQL_CLIENT_INTERACTIVE</tt></b>. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a MySQL persistent link identifier on success, or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.3.0</td> <td colspan="1" rowspan="1" align="left"> Added the <i><tt class="parameter">client_flags</tt></i> parameter. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">3.0.10</td> <td colspan="1" rowspan="1" align="left"> Added support for ":/path/to/socket" with <i><tt class="parameter">server</tt></i>. </td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">3.0.0</td> <td colspan="1" rowspan="1" align="left"> Added support for ":port" with <i><tt class="parameter">server</tt></i>. </td> </tr> </tbody> </colgroup> </table> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: Note, that these kind of links only work if you are using a module version of PHP. See the <a href="features.persistent-connections.html" class="link">Persistent Database Connections</a> section for more information. <br /> </p></blockquote> <div class="warning"><b class="warning">Warning</b> <p class="para"> Using persistent connections can require a bit of tuning of your Apache and MySQL configurations to ensure that you do not exceed the number of connections allowed by MySQL. </p> </div> <blockquote><p><b class="note">Note</b>: You can suppress the error message on failure by prepending a <a href="language.operators.errorcontrol.html" class="link">@</a> to the function name. <br /> </p></blockquote> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.mysql-connect.html" class="function" rel="rdfs-seeAlso">mysql_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.mysql-num-rows.html">mysql_num_rows</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mysql-ping.html">mysql_ping</a></div> <div class="up"><a href="ref.mysql.html">MySQL 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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