<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.oci-set-client-identifier" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>oci_set_client_identifier</refname>
  <refpurpose>Sets the client identifier</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>oci_set_client_identifier</methodname>
   <methodparam><type>resource</type><parameter>connection</parameter></methodparam>
   <methodparam><type>string</type><parameter>client_id</parameter></methodparam>
  </methodsynopsis>
  <para>
   Sets the client identifier used by various database components to
   identify lightweight application users who authenticate as the same
   database user.
  </para>
  <para>
   The client identifier is registered with the database when the next
   'round-trip' from PHP to the database occurs, typically when an SQL
   statement is executed.
  </para>
  <para>
   The identifier can subsequently be queried, for example
   with <literal>SELECT SYS_CONTEXT('USERENV','CLIENT_IDENTIFIER')
   FROM DUAL</literal>.  Database administration views such
   as <literal>V$SESSION</literal> will also contain the value.  It
   can be used with <literal>DBMS_MONITOR.CLIENT_ID_TRACE_ENABLE</literal>
   for tracing and can also be used for auditing.
  </para>
  <para>
   The value may be retained across page requests that use the same persistent connection.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection</parameter></term>
     <listitem>
      &oci.parameter.connection;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>client_id</parameter></term>
     <listitem>
      <para>
       User chosen string up to 64 bytes long.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Setting the client identifier to the application user</title>
    <programlisting role="php">
<![CDATA[
<?php

// Find the application user's login name
session_start();
$un = my_validate_session($_SESSION['username']);
$c = oci_connect('myschema', 'welcome', 'localhost/XE');

// Tell Oracle who that user is
oci_set_client_identifier($c, $un);

// The next round-trip to the database will piggyback the identifier
$s = oci_parse($c, 'select mydata from mytable');
oci_execute($s);

// ...

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &oci.roundtrip.caution;
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>oci_set_module_name</function></member>
    <member><function>oci_set_action</function></member>
    <member><function>oci_set_client_info</function></member>
    <member><function>oci_set_db_operation</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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