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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 308253 $ -->
<refentry xml:id="function.mssql-pconnect" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>mssql_pconnect</refname>
<refpurpose>Open persistent MS SQL connection</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>resource</type><methodname>mssql_pconnect</methodname>
<methodparam choice="opt"><type>string</type><parameter>servername</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>username</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>password</parameter></methodparam>
<methodparam choice="opt"><type>bool</type><parameter>new_link</parameter><initializer>false</initializer></methodparam>
</methodsynopsis>
<para>
<function>mssql_pconnect</function> acts very much like
<function>mssql_connect</function> with two major differences.
</para>
<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.
</para>
<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 (<function>mssql_close</function> will not
close links established by <function>mssql_pconnect</function>).
</para>
<para>
This type of links is therefore called 'persistent'.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>servername</parameter></term>
<listitem>
<para>
The MS SQL server. It can also include a port number. e.g.
<literal>hostname:port</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>username</parameter></term>
<listitem>
<para>
The username.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>password</parameter></term>
<listitem>
<para>
The password.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>new_link</parameter></term>
<listitem>
<para>
If a second call is made to <function>mssql_pconnect</function> 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
<function>mssql_pconnect</function> always open a new link, even if
<function>mssql_pconnect</function> was called before with the same
parameters.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a positive MS SQL persistent link identifier on success, or
&false; on error.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>mssql_pconnect</function> using the <parameter>new_link</parameter> parameter</title>
<programlisting role="php">
<![CDATA[
<?php
// Connect to MSSQL and select the database
$link1 = mssql_pconnect('MANGO\SQLEXPRESS', 'sa', 'phpfi');
mssql_select_db('php', $link1);
// Create a new link
$link2 = mssql_pconnect('MANGO\SQLEXPRESS', 'sa', 'phpfi', true);
mssql_select_db('random', $link2);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
</refentry>
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