In the update trigger, you need to delete the corresponding feature if one of the coordinates becomes null.
在更新触发器中,如果坐标值之一变成null,那么需要删除对应的特性。
The update trigger is more complicated: if the update causes an exception, you have to delete the existing feature row, just as for null coordinates.
更新触发器比较复杂:如果更新导致异常,那么必须删除现有的特性行,就像处理null坐标一样。
An alternative way of creating a heap dump is to use another useful Rubinius feature: the Query Agent, which allows monitoring tools to access Rubinius information as well as trigger certain actions.
创建堆转储的另外一种方式是使用Rubinius的另一个特性:Query Agent,监测工具可以凭借它访问Rubinius信息并触发某些动作。
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