If you need to wait on a blocking action — say, the results from a remote database query — it is not clear exactly how long you will need to wait for results to be available.
如果您需要等待一个阻塞操作—比如，对于来自远程数据库查询的结果—您不会确切地知道在可以使用结果之前究竟要等待多长时间。
Thus, the query in Listing 13 remains the same even if underlying data was stored in a remote DB2, Oracle, or other database.
因此，清单13中的查询保持不变，即使底层的数据是存储在远程DB 2、Oracle或其他数据库中。
This thesis, on the basis of a synthesized resin product database system with functions of query and input from remote host, researches how to protect the system from hostile attacks.
本课题所研究的内容，是在开发一个具有网络查询录入功能的合成树脂产品数据库系统的基础上，研究如何在网络上保护该系统不被恶意攻击。
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