October 2010
Intermediate to advanced
1920 pages
73h 55m
English
Content preview from ASP.NET 4 UnleashedBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Building Entity Associations
One entity can be associated with another entity. For example, a MovieCategory entity might be associated with one or more Movie entities.
If you have defined foreign key relationships between your database tables, these relationships are preserved when you drag your tables onto the LINQ to SQL Designer. The LINQ to SQL Designer generates entity associations based on the foreign key relationships automatically.
For example, the MovieCategory entity is related to the Movie entity through the Movie entity’s CategoryId property. As long as you have defined a foreign key relationship between Movie.CategoryId and MovieCategory.Id, you can use a query like this following:
The second statement grabs the Drama movie category. ...
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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.