Database Error

[Hotortillas]

I have a site that gets just about 100 people everyday but I getting this error message a lot:


Warning: mysqli::mysqli() [mysqli.mysqli]: (42000/1203): User mexautos_Juan already has more than 'max_user_connections' active connections in /home/mexautos/public_html/kiubbo/data/model.php on line 26

Warning: mysqli::query() [mysqli.query]: Couldn't fetch mysqli in /home/mexautos/public_html/kiubbo/data/model.php on line 87
Query failed

I refresh the page a couple of time and now its ok, but since I dont have that many users I suspect the error its in my code, where should I look for it?

Thx

Edit: this is the model file:


<?php
/*

Model is the base class from which the other
model classes will be derived. It offers basic
functionality to access databases

*/
require_once($_SERVER['DOCUMENT_ROOT'].'/config.php');
require_once(SITE_ROOT.'includes/exceptions.php');

class Model {

private $created;
private $modified;

static function getConnection()
{
/*

Connect to the database and return a
connection or null on failure

*/

$db = new mysqli (DB_HOST, DB_USER, DB_PASS, DB_NAME);
if(!$db) {
echo mysql_error();
throw new Exception('Could not connect to database', EX_NO_DATABASE_CONNECTION);
}

return $db;

}

static function execSQL($query)
{
/*
Execute a SQL query on the database
passing the tablename and the sql query.
Returns the resultset
*/


$db = null;
$results = null;
//echo "query is $query";

try
{
$db = Model::getConnection();
$results = $db->query($query);
if(!$results) {
throw new Exception('Query failed', EX_QUERY_FAILED );
}
}
catch(Exception $e)
{
/* errors are handled higher in the
object hierarchy
*/

throw $e;
}

Model::closeConnection($db);

return $results;
}

static function execSQl2($query)
{
/*
Execute a SQL query on the database
passing the tablename and the sql query.
Returns the LAST_INSERT_ID
*/


$db = null;
$lastid = null;
//echo "query is $query";

try
{
$db = Model::getConnection();
$results = $db->query($query);
if(!$results) {
throw new Exception('Query failed', EX_QUERY_FAILED );
}
$lastid = $db->insert_id;
}
catch(Exception $e)
{
/* errors are handled higher in the
object hierarchy
*/

throw $e;
}

Model::closeConnection($db);

return $lastid;
}

function delete($table, $id, $conditions = '')
{
$query = "delete from $table where id = $id";
try
{
$db = Model::getConnection();
$results = Model::execSQL($query);
if(!$results){
throw new Exception('Could not delete this object', EX_DELETE_ERROR);
}
return $results->num_rows;
}

catch(Exception $e)
{
throw $e;
}
}

static function closeConnection($db)
{
$db->close();
}

function getCreated()
{
return $this->created;
}

function setCreated($value)
{
$this->created = $value;
}

function getModified()
{
return $this->modified;
}

function setModified($value)
{
$this->modified = $value;
}



}

?>