November 2001
Intermediate to advanced
504 pages
10h 18m
English
Content preview from Developing Applications with Java™ and UML
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Mapping Classes to Tables
The easiest way to translate classes into tables is to make a one-to-one mapping (see Figure 9-2). I strongly recommend against this approach, yet it is done more often than you might realize. One-to-one mapping can lead to the following problems:
Figure 9-2. Remulak class diagram
Too many tables: Most object-to-relational translations done with one-to-one mapping produce more tables than are actually necessary.
Too many joins: If there are too many tables, then logically there will be too many SQL join operations.
Missed tables: Any many-to-many association (e.g., Customer and Address) will require a third relational table ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.