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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.3 $ -->
<refentry id="function.maxdb-select-db">
<refnamediv>
<refname>maxdb_select_db</refname>
<refname>maxdb->select_db</refname>
<refpurpose>Selects the default database for database queries</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>maxdb_select_db</methodname>
<methodparam><type>resource</type><parameter>link</parameter></methodparam>
<methodparam><type>string</type><parameter>dbname</parameter></methodparam>
</methodsynopsis>
<para>
The <function>maxdb_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>maxdb_connect</function>.
</para>
</note>
</refsect1>
<refsect1>
<title>Return values</title>
<para>
&return.success;
</para>
</refsect1>
<refsect1>
<title>See also</title>
<para>
<function>maxdb_connect</function>
<function>maxdb_real_connect</function>
</para>
</refsect1>
<refsect1>
<title>Example</title>
<example>
<title>Object oriented style</title>
<programlisting role="php">
<![CDATA[
<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
/* return name of current default database */
if ($result = $maxdb->query("SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}
/* change db to non existing db */
$maxdb->select_db("XXXXXXXX");
/* return name of current default database */
if ($result = $maxdb->query("SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
$result->close();
}
$maxdb->close();
?>
]]>
</programlisting>
</example>
<example>
<title>Procedural style</title>
<programlisting role="php">
<![CDATA[
<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
/* return name of current default database */
if ($result = maxdb_query($link, "SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
$row = maxdb_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
maxdb_free_result($result);
}
/* change db to non existing db */
maxdb_select_db($link, "XXXXXXXX");
/* return name of current default database */
if ($result = maxdb_query($link, "SELECT SERVERDB FROM USERS WHERE USERNAME='MONA'")) {
$row = maxdb_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
maxdb_free_result($result);
}
maxdb_close($link);
?>
]]>
</programlisting>
</example>
<para>
The above examples would produce the following output:
</para>
<screen>
<![CDATA[
Default database is <...>.
Warning: maxdb_select_db(): -10709 Connection failed (RTE:database not running) <...>
Warning: maxdb_query(): -10821 Session not connected [] <...>
Warning: maxdb_close(): -10821 Session not connected [] <...>
]]>
</screen>
</refsect1>
</refentry>
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