private function initialize()
{
//将实际数据库结点对应至圆上
$total_table_num = parent::getDbTotalNum();
for ($i = 0; $i < $total_table_num; $i++) {
$db_name = substr_replace(parent::getDbPrefix(), $i, strlen(parent::getDbPrefix()) - strlen($i));
$this->hash->addTarget($db_name);
}
}
