function.mssql-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 persistent MS SQL 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.mssql-num-rows.html">mssql_num_rows</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mssql-query.html">mssql_query</a></div> <div class="up"><a href="ref.mssql.html">Mssql Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.mssql-pconnect" class="refentry"> <div class="refnamediv"> <h1 class="refname">mssql_pconnect</h1> <p class="verinfo">(PHP 4, PHP 5, PECL odbtp:1.1.1-1.1.4)</p><p class="refpurpose"><span class="refname">mssql_pconnect</span> — <span class="dc-title">Open persistent MS SQL 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>mssql_pconnect</b></b></span> ([ <span class="methodparam"><span class="type">string</span> <tt class="parameter">$servername</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$username</tt></span> [, <span class="methodparam"><span class="type">string</span> <tt class="parameter">$password</tt></span> [, <span class="methodparam"><span class="type">bool</span> <tt class="parameter">$new_link</tt></span> ]]]] )</div> <p class="para rdfs-comment"> <b>mssql_pconnect()</b> acts very much like <a href="function.mssql-connect.html" class="function">mssql_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.mssql-close.html" class="function">mssql_close()</a> will not close links established by <b>mssql_pconnect()</b>). </p> <p class="para"> This type of links 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">servername</tt></i></span> <dd> <p class="para"> The MS SQL server. It can also include a port number. e.g. <i>hostname:port</i>. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">username</tt></i></span> <dd> <p class="para"> The username. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">password</tt></i></span> <dd> <p class="para"> The password. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">new_link</tt></i></span> <dd> <p class="para"> If a second call is made to <b>mssql_pconnect()</b> with the same arguments, no new link will be established, but instead, the link identifier of the already opened link will be returned. This parameter modifies this behavior and makes <b>mssql_pconnect()</b> always open a new link, even if <b>mssql_pconnect()</b> was called before with the same parameters. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns a positive MS SQL persistent link identifier on success, or <b><tt>FALSE</tt></b> on error. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>mssql_pconnect()</b> using the <i><tt class="parameter">new_link</tt></i> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Connect to the database server<br /></span><span style="color: #0000BB">$link1 </span><span style="color: #007700">= </span><span style="color: #0000BB">mssql_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">'MANGO\SQLEXPRESS'</span><span style="color: #007700">, </span><span style="color: #DD0000">'sa'</span><span style="color: #007700">, </span><span style="color: #DD0000">'phpfi'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mssql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">'php'</span><span style="color: #007700">, </span><span style="color: #0000BB">$link1</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Create a new link<br /></span><span style="color: #0000BB">$link2 </span><span style="color: #007700">= </span><span style="color: #0000BB">mssql_pconnect</span><span style="color: #007700">(</span><span style="color: #DD0000">'MANGO\SQLEXPRESS'</span><span style="color: #007700">, </span><span style="color: #DD0000">'sa'</span><span style="color: #007700">, </span><span style="color: #DD0000">'phpfi'</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">mssql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">'random'</span><span style="color: #007700">, </span><span style="color: #0000BB">$link2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.mssql-num-rows.html">mssql_num_rows</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.mssql-query.html">mssql_query</a></div> <div class="up"><a href="ref.mssql.html">Mssql 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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