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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<refentry id="function.mysqli-select-db">
<refnamediv>
<refname>mysqli_select_db</refname>
<refname>mysqli->select_db</refname>
<refpurpose>Selects the default database for database queries</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>mysqli_select_db</methodname>
<methodparam><type>mysqli</type><parameter>link</parameter></methodparam>
<methodparam><type>string</type><parameter>dbname</parameter></methodparam>
</methodsynopsis>
<para>
The <function>mysqli_select_db</function> function selects the default
database (specified by the <parameter>dbname</parameter> parameter) to be
used when performing queries against the database connection
represented by the <parameter>link</parameter> parameter.
</para>
<note>
<para>
This function should only be used to change the default database for the connection.
You can select the default database with 4th parameter in <function>mysqli_connect</function>.
</para>
</note>
</refsect1>
<refsect1>
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1>
&reftitle.seealso;
<para>
<function>mysqli_connect</function>&listendand;
<function>mysqli_real_connect</function>.
</para>
</refsect1>
<refsect1>
&reftitle.examples;
<example>
<title>Object oriented style</title>
<programlisting role="php">
<![CDATA[
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}
/* change db to world db */
$mysqli->select_db("world");
/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}
$mysqli->close();
?>
]]>
</programlisting>
</example>
<example>
<title>Procedural style</title>
<programlisting role="php">
<![CDATA[
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
mysqli_free_result($result);
}
/* change db to world db */
mysqli_select_db($link, "world");
/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
mysqli_free_result($result);
}
mysqli_close($link);
?>
]]>
</programlisting>
</example>
&example.outputs;
<screen>
<![CDATA[
Default database is test.
Default database is world.
]]>
</screen>
</refsect1>
</refentry>
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