你是唯一的例外。
The correct answer here is A. An exception will be thrown, indicating that you are trying to perform an update operation on a read-only connection.
会抛出一个异常,表示您正在试图对一个只读连接执行更新。
For each operation on the left-side (that you are exposing), define an implementation (the only exception is if you don't want to implement the entire interface now).
为左侧的每个操作(正在公开的)定义一个实现(除非您不想现在就实现整个界面)。
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