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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.8 $ -->
<refentry id="function.mysqli-thread-id">
<refnamediv>
<refname>mysqli_thread_id</refname>
<refname>mysqli->thread_id</refname>
<refpurpose>Returns the thread ID for the current connection</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>Procedural style:</para>
<methodsynopsis>
<type>int</type><methodname>mysqli_thread_id</methodname>
<methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
</methodsynopsis>
<para>Object oriented style (property):</para>
<classsynopsis>
<ooclass><classname>mysqli</classname></ooclass>
<fieldsynopsis><type>int</type><varname>thread_id</varname></fieldsynopsis>
</classsynopsis>
<para>
The <function>mysqli_thread_id</function> function returns the thread
ID for the current connection which can then be killed using the
<function>mysqli_kill</function> function. If the connection is lost
and you reconnect with <function>mysqli_ping</function>, the thread ID
will be other. Therefore you should get the thread ID only when you need it.
</para>
<note>
<para>
The thread ID is assigned on a connection-by-connection basis. Hence,
if the connection is broken and then re-established a new thread ID
will be assigned.
</para>
<para>
To kill a running query you can use the SQL command <literal>KILL QUERY processid</literal>.
</para>
</note>
</refsect1>
<refsect1>
&reftitle.returnvalues;
<para>
<function>mysqli_thread_id</function> returns the Thread ID for the current connection.
</para>
</refsect1>
<refsect1>
&reftitle.seealso;
<para>
<function>mysqli_kill</function>.
</para>
</refsect1>
<refsect1>
&reftitle.examples;
<example>
<title>Object oriented style</title>
<programlisting role="php">
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* determine our thread id */
$thread_id = $mysqli->thread_id;
/* Kill connection */
$mysqli->kill($thread_id);
/* This should produce an error */
if (!$mysqli->query("CREATE TABLE myCity LIKE City")) {
printf("Error: %s\n", $mysqli->error);
exit;
}
/* close connection */
$mysqli->close();
?>
]]>
</programlisting>
</example>
<example>
<title>Procedural style</title>
<programlisting role="php">
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* determine our thread id */
$thread_id = mysqli_thread_id($link);
/* Kill connection */
mysqli_kill($link, $thread_id);
/* This should produce an error */
if (!mysqli_query($link, "CREATE TABLE myCity LIKE City")) {
printf("Error: %s\n", mysqli_error($link));
exit;
}
/* close connection */
mysqli_close($link);
?>
]]>
</programlisting>
</example>
&example.outputs;
<screen>
<![CDATA[
Error: MySQL server has gone away
]]>
</screen>
</refsect1>
</refentry>
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