Even though the goal of this article is not to explain how a relational database works in detail, a brief overview is in order.
尽管本文的目的不是要详细地解释关系数据库如何运作，但做一个简短的概述还是适宜的。
For this tutorial to be useful, you should have background knowledge of how a relational database works as well as basic knowledge of the following concepts.
为了利用好本教程，您应该具有关系数据库方面的背景知识以及以下概念的基础知识。
Deleting an object from the database works along the same lines as retrieval and update: By default, when an object is deleted, none of the objects it references are deleted with it.
从数据库中删除对象与检索和更新对象类似：默认情况下，删除一个对象时，不删除它引用的对象。
Consult your database documentation for details about how your database works with primary key constraints.
有关数据库如何使用主键约束的详细信息，请查阅数据库文档。
For more information and examples of how your database works with parameters, see the documentation for your database server.
有关数据库如何使用参数的更多信息和示例，请参见数据库服务器的文档。
For more information and examples of how your database works with parameters, see the documentation for your database server.
有关数据库如何使用参数的更多信息和示例，请参见数据库服务器的文档。
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