The logging support class contains methods to view current filters, add or update a filter and its logging level, and test a given filter logging level.
日志支持类包含的方法可用于查看当前过滤器、增加或更新过滤器及其日志级别，以及测试给定的日志级别。
2
You cannot set a logging levelfilter lower than the base level of a handler.
您不能设置低于处理器的基本日志级别的日志级别过滤器。
3
The last section discussed how to apply filter predicates at the database level to improve query performance and response times.