Thus far, we discussed how to write your JDBC Data Mediator Service code to perform some basic select queries and more advanced queries involving filters and multiple tables against a database.
到现在为止，我们讨论了如何编写 JDBC 数据中介服务代码来执行一些基本选择查询和更高级的查询（涉及过滤器和数据库中的多个表）。
It allows applications to perform constant data load operations to a table in the background while the interactive read and write operations can occur concurrently.
它允许应用程序在后台对表执行恒定数据加载操作，同时可以执行交互式读取和写入操作。
While you're at it, you'll write diagnostic records every time you perform a COMMIT, as well as at the start and end of the process, for performance-measurement purposes.
在这样做的同时，为了进行性能度量，将在每次执行 COMMIT 时以及过程的开头和结尾写诊断记录。
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