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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.14 $ -->
<refentry id="function.mysqli-change-user">
<refnamediv>
<refname>mysqli_change_user</refname>
<refname>mysqli->change_user</refname>
<refpurpose>Changes the user of the specified database connection</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>Procedural style:</para>
<methodsynopsis>
<type>bool</type><methodname>mysqli_change_user</methodname>
<methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
<methodparam><type>string</type><parameter>user</parameter></methodparam>
<methodparam><type>string</type><parameter>password</parameter></methodparam>
<methodparam><type>string</type><parameter>database</parameter></methodparam>
</methodsynopsis>
<para>Object oriented style (method):</para>
<classsynopsis>
<ooclass><classname>mysqli</classname></ooclass>
<methodsynopsis>
<type>bool</type><methodname>change_user</methodname>
<methodparam><type>string</type><parameter>user</parameter></methodparam>
<methodparam><type>string</type><parameter>password</parameter></methodparam>
<methodparam><type>string</type><parameter>database</parameter></methodparam>
</methodsynopsis>
</classsynopsis>
<para>
<function>mysqli_change_user</function> is used to change the user of the specified
database connection as given by the <parameter>link</parameter> parameter and to set the
current database to that specified by the <parameter>database</parameter> parameter.
</para>
<para>
If desired, the &null; value may be passed in place of the <parameter>database</parameter>
parameter resulting in only changing the user and not selecting a database. To select
a database in this case use the <function>mysqli_select_db</function> function.
</para>
<para>
In order to successfully change users a valid <parameter>username</parameter> and
<parameter>password</parameter> parameters must be provided and that user must have
sufficient permissions to access the desired database. If for any reason authorization
fails, the current user authentication will remain.
</para>
<note>
<para>
Using this command will always cause the current database connection to behave as if
was a completely new database connection, regardless of if the operation was completed
successfully. This reset includes performing a rollback on any active transactions,
closing all temporary tables, and unlocking all locked tables.
</para>
</note>
</refsect1>
<refsect1>
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1>
&reftitle.seealso;
<para>
<function>mysqli_connect</function>&listendand;
<function>mysqli_select_db</function>.
</para>
</refsect1>
<refsect1>
&reftitle.examples;
<example>
<title>Object oriented style</title>
<programlisting role="php">
<![CDATA[
<?php
/* connect database test */
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
$mysqli->query("SET @a:=1");
/* reset all and select a new database */
$mysqli->change_user("my_user", "my_password", "world");
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database: %s\n", $row[0]);
$result->close();
}
if ($result = $mysqli->query("SELECT @a")) {
$row = $result->fetch_row();
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
$result->close();
}
/* close connection */
$mysqli->close();
?>
]]>
</programlisting>
</example>
<example>
<title>Procedural style</title>
<programlisting role="php">
<![CDATA[
<?php
/* connect database test */
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
mysqli_query($link, "SET @a:=1");
/* reset all and select a new database */
mysqli_change_user($link, "my_user", "my_password", "world");
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database: %s\n", $row[0]);
mysqli_free_result($result);
}
if ($result = mysqli_query($link, "SELECT @a")) {
$row = mysqli_fetch_row($result);
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>
]]>
</programlisting>
</example>
&example.outputs;
<screen>
<![CDATA[
Default database: world
Value of variable a is NULL
]]>
</screen>
</refsect1>
</refentry>
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