拿着锡
发表于 2025-3-21 19:23:31
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wangle
发表于 2025-3-21 21:54:15
simplifications and pragmatic decisions. The rationale is to try to keep a design simple, but allow room for development as situations change or resources permit..Provides solid design prin978-1-4302-4209-3978-1-4302-4210-9
召集
发表于 2025-3-22 03:49:20
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表示问
发表于 2025-3-22 05:50:23
Initial Requirements and Use Cases,o make sure we really understand the problem. This may sound obvious, but it is surprising how often people set about implementing a database before they understand the problem completely. There are two things we need to do: understand what tasks need to be carried out by all the people who will use
DEMUR
发表于 2025-3-22 12:18:51
Learning from the Data Model,first attempt at determining the data that are necessary to support those tasks and formed an initial data model, which we depicted with a class diagram. In this chapter, we look more closely at the data model to see how it can further our understanding of a database system.
ENNUI
发表于 2025-3-22 15:11:43
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挥舞
发表于 2025-3-22 17:50:12
Generalization and Specialization,might like. We might find that we have some objects for which some of the attributes do not really apply. For example, if we have a class to record information about all the people associated with a company, we might find that some have hourly pay rates while others have annual salaries. In many res
功多汁水
发表于 2025-3-22 22:59:25
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circumvent
发表于 2025-3-23 04:40:29
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者变
发表于 2025-3-23 06:36:52
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