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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.sybase-pconnect">
<refnamediv>
<refname>sybase_pconnect</refname>
<refpurpose>Open persistent Sybase connection</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>resource</type><methodname>sybase_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>string</type><parameter>charset</parameter></methodparam>
<methodparam choice="opt"><type>string</type><parameter>appname</parameter></methodparam>
</methodsynopsis>
<para>
<function>sybase_pconnect</function> acts very much like
<function>sybase_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>sybase_close</function> will not
close links established by <function>sybase_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 servername argument has to be a valid servername that is defined
in the 'interfaces' file.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>username</parameter></term>
<listitem>
<para>
Sybase user name
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>password</parameter></term>
<listitem>
<para>
Password associated with <parameter>username</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>charset</parameter></term>
<listitem>
<para>
Specifies the charset for the connection
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>appname</parameter></term>
<listitem>
<para>
Specifies an <literal>appname</literal> for the Sybase connection.
This allow you to make separate connections in the same script to the
same database. This may come handy when you have started a transaction
in your current connection, and you need to be able to do a separate
query which cannot be performed inside this transaction.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a positive Sybase persistent link identifier on success, or
&false; on error.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>4.2.0</entry>
<entry>
The <parameter>appname</parameter> parameter was added.
</entry>
</row>
<row>
<entry>4.0.2</entry>
<entry>
The <parameter>charset</parameter> parameter was added.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>sybase_connect</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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