Object is used to manage constraints between the dataset tables such as cascading updates and to allow you to navigate between related master and child records 对象用于管理数据集表之间的约束（如级联更新） ，并允许您在相关主记录和子记录之间移动。
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The after trigger operation checks for the effects of the triggering statement and also all referential cascade update and delete actions that are caused by the triggering statement After触发器操作要检查触发语句的效果，也包括所有由触发语句引起的update和delete引用级联操作。
