This article introduces the point-to-point com munication between computers based on PSTN, combining it with database technique, a remote database query is implemented.
介绍了计算机之间通过电话网的点对点通信方式，在此基础上与数据库结合实现了远程数据库查询。
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。
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