Need PHP code for exporting *.sql

[AZone]

I have *sql file (back-up of my forum).

Now I need install (export, extract...) it, but my server doesn't have any Web-manager (like phpMyAdmin, nothing at all) and doesn't allow CGI sripts.
Only one way - PHP

I have sample, but it doesn't work:

<?php
$sqlEx = "sql"; //
$schema = "vbulletin"; //

$sql = explode(";", implode("", file("./".$schema.".".$sqlEx)));
for ($i = 0; $i < count($sql); $i++) mysql_query($sql[$i]) or
die(mysql_error());
?>

I have message - "No Database Selected"

Help me, please!