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<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></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 the database server
$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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