(PECL mongo >=1.3.0)
MongoClient::selectDB — 获取一个数据库
This extension that defines this method is deprecated. Instead, the MongoDB extension should be used. There is no equivalent for this method in the new extension, but there is an alternative in the PHP library:
name
数据库名。
返回一个新的数据库对象。
如果数据库名无效，将会抛出 Exception。