core/xpdo/om/mysql/connect.inc.php
<?php
if (!empty($this->config['charset'])) {
$sql = '';
$method = 'SET NAMES';
if (!empty($this->config['connection_method'])) {
$method = $this->config['connection_method'];
}
$sql.= "{$method} '{$this->config['charset']}'";
if ($method == 'SET NAMES' && !empty($this->config['collation'])) {
$sql.= " COLLATE '{$this->config['collation']}'";
}
$this->pdo->exec($sql);
}