您必须了解在产生的资料集程序码中，如何建立资料库中的外部索引键条件约束和串联行为。

It is important to understand how foreign-key constraints and cascading behavior in the database are created in the generated dataset code.

youdao

例如，建立新的客户和新的订单，然后尝试储存资料，会导致资料库中所定义的外部索引键条件约束发生冲突。

For example, creating a new customer and a new order and then trying to save the data can cause a conflict with the foreign-key constraints defined in the database.

youdao