$config['hostname'] = $server_ip;
    $config['username'] = $sql_account;
    $config['password'] = $sql_pwd;
    $config['database'] = $sql_dbname;
    $config['dbdriver'] = "mysql";
    $config['dbprefix'] = "";
    $config['pconnect'] = FALSE;
    $config['db_debug'] = TRUE;
    $config['cache_on'] = FALSE;
    $config['cachedir'] = "";
    $config['char_set'] = "utf8";
    $config['dbcollat'] = "utf8_general_ci";
    $DB1 = $this->load->database($config, TRUE);
 
    $sql = "SHOW TABLES WHERE Tables_in_{$sql_dbname} = 'zen_configuration';";
    $res_r = $DB1->query($sql);
    if($res_r -> num_rows()>0){
      //更新相应数据库信息
     }
//更新主数据库信息
$this->load->database('default', TRUE);
    $sql_my = "INSERT INTO syn_siteid_log(website_id,old_site_id,new_site_id,d_datetime)VALUES('{$website_id}','{$old_site_id}','$site_id',NOW());";
    $this->db->query($sql_my);