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）。
Some basic networking concepts were presented, as well as a summary of required packages and commands to operate with filters.
同时还讲解了一些基本的网络概念，并总结了执行过滤所要用到的包和命令。
You had three choices: simulate transparency using flat images, deal with PNG's cross-browser incompatibilities, or struggle with CSS 'basic transparency selectors and filters.
你有三种选择：使用平面图像模拟的透明度，使用不能跨浏览器兼容的PNG格式，或者去折腾CSS基本的透明选择器和滤镜。
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