在关系数据库中，无法表示为基本数据值的记录的对象必须通过数据库联结进行组装。
In a relational databases, objects that can't be represented as records of basic data values must be assembled through database joins.
您一旦了解了 find 方法如何帮助您动态定义控件，您就可以开始编写 getter 方法了，这样您就可以不依赖被记录的对象地图（Object Map）来定位对象了。
As soon as you understand how find helps you define your controls dynamically, you can begin to write getter methods, so you can locate objects without relying on a recorded Object Map.
对于删除操作，将记录删除前数据对象的全部状态。
Deletions record the entire state of the DataObject before it was deleted.
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