Recent Additions To My NHibernate Examples

4 commentsWritten on May 8th, 2011 by
Categories: NHibernate

I've been pretty busy lately with the prep-work for my NHibernate course and my NHibernate examples, which the course leans on pretty heavily. Below is a list of examples that have been added in the past few weeks:

  • optimistic concurrency
    • optimistic-lock="all"
    • optimistic-lock="dirty"
    • version
  • pessimistic locking
  • performance
    • executable hql (updates/deletes)
    • extra lazy collection
    • futures
    • paging through collections
    • proxies
  • querying
    • aggregate functions (HQL/Criteria/LINQ/QueryOver)
    • eager fetching (HQL/Criteria/LINQ/QueryOver)
    • group by (HQL/Criteria/LINQ/QueryOver)
    • ordering (HQL/Criteria/LINQ/QueryOver)
    • paging (HQL/Criteria/LINQ/QueryOver)
    • polymorphism (HQL/Criteria/LINQ/QueryOver)
    • projections (HQL/Criteria/LINQ/QueryOver)
    • restrictions (HQL/Criteria/LINQ/QueryOver)
    • subqueries (HQL/Criteria/LINQ/QueryOver)
    • unique results (HQL/Criteria/LINQ/QueryOver)
    • native sql
    • stored procedures

And there's quite a bit more to come in the next 2 weeks or so...

The examples now also run on SQL Server with both Fluent NHibernate as well as normal mapping files. If you're interested, you can get them here.

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This entry was posted on Sunday, May 8th, 2011 at 21:55 and is filed under NHibernate. You can subscribe to any comments to this entry via RSS 2.0. You can leave a response, or trackback from your own site.

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  • http://ceilidhboy.myopenid.com/ Mike Scott

    This may have been discussed in the past, but I note your Entity class GetHashCode() function returns a different hash depending on whether the instance is transient or not.

    This will cause problems if a transient instance is used as a key in a dictionary or other hash-based container and is subsequently saved, altering its hash.

    I acknowledge that using an entity as a key in a dictionary is unlikely, but is this sufficient? If so, shouldn’t there at least be a warning somewhere?

    • http://davybrion.com Davy Brion

      if the hashcode implementation is wrong, you don’t only run into problems when using the entity as a key in a dictionary, but simply with storing it in a set as well… that is, storing it in a set works, trying to remove it won’t

      the GetHashCode implementation that i use actually saves the hashcode in case it’s a transient instance, and when it is subsequently retrieved after an ID has been set, it will use the previously stored hashcode value… exactly to avoid these problems :)  

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