Setup::_validateDatabase PHP Method

    private function _validateDatabase()
    {
        if ($this->input->post()) {
            $this->form_validation->set_rules('database', 'lang:label_database', 'xss_clean|trim|required');
            $this->form_validation->set_rules('hostname', 'lang:label_hostname', 'xss_clean|trim|required');
            $this->form_validation->set_rules('username', 'lang:label_username', 'xss_clean|trim|required');
            $this->form_validation->set_rules('password', 'lang:label_password', 'xss_clean|trim|required');
            $this->form_validation->set_rules('dbprefix', 'lang:label_prefix', 'xss_clean|trim|required');
            if ($this->form_validation->run() === TRUE) {
                if ($this->installer->testDbConnection() === FALSE) {
                    $this->alert->set('danger_now', $this->lang->line('alert_database_error'));
                } else {
                    if ($this->installer->writeDbConfiguration() === TRUE) {
                        return TRUE;
                    }
                }
            }
        }
        return FALSE;
    }