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POHow do I enforce data integrity rules in my database?
 

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    <p>I'm designing this collection of classes and abstract (MustInherit) classes…</p> <p><a href="http://img396.imageshack.us/img396/1711/nodeclassinheritanceej0.gif" rel="nofollow noreferrer">class diagram http://img396.imageshack.us/img396/1711/nodeclassinheritanceej0.gif</a></p> <p>This is the database table where I'm going to store all this…</p> <p><a href="http://img179.imageshack.us/img179/3237/nodetablenorootln3.gif" rel="nofollow noreferrer">database table http://img179.imageshack.us/img179/3237/nodetablenorootln3.gif</a></p> <p>As far as the Microsoft SQL Server database knows, those are all nullable ("Allow Nulls") columns.</p> <p>But really, that depends on the class stored there: LinkNode, HtmlPageNode, or CodePageNode.</p> <p>Rules might look like this...</p> <p><a href="http://img127.imageshack.us/img127/74/datarulesha0.gif" rel="nofollow noreferrer">rules table http://img127.imageshack.us/img127/74/datarulesha0.gif</a></p> <p>How do I enforce such data integrity rules within my database?</p> <hr> <p>UPDATE: Regarding this single-table design...</p> <p>I'm still trying to zero in on a final architecture.</p> <p>I initially started with many small tables with almost zero nullalbe fields.<br> <a href="https://stackoverflow.com/questions/56981/which-is-the-best-database-schema-for-my-navigation">Which is the best database schema for my navigation?</a></p> <p>And I learned about the LINQ to SQL IsDiscriminator property.<br> <a href="https://stackoverflow.com/questions/57152/whats-the-best-way-to-handle-one-to-one-relationships-in-sql">What’s the best way to handle one-to-one relationships in SQL?</a></p> <p>But then I learned that LINQ to SQL only supports single table inheritance.<br> <a href="https://stackoverflow.com/questions/67659/can-a-linq-to-sql-isdiscriminator-column-not-inherit">Can a LINQ to SQL IsDiscriminator column NOT inherit?</a></p> <p>Now I'm trying to handle it with a collection of classes and abstract classes.<br> <a href="https://stackoverflow.com/questions/84263/please-help-me-with-my-net-abstract-classes">Please help me with my .NET abstract classes.</a></p>
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