Contents tagged with Object persistence
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MS Visio Coolness
Yesterday I decided to fiddle around with MS Visio for Enterprise Architects database modelling tools. After drawing up and validating a pretty straight-forward use case i created a new Database Model Diagram Template from visio. After telling Visio to use the Sql Server ODBC driver I got all the Sql datatypes correct for my Entity construction. Relationships creates foreign keys automatically.
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StackOverflowException in Typed Dataset
I just killed a System.StackOverflowException that occured when calling the GetChanges() method on my typed Dataset.
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Set codegen:nullValue in your XSD and get... null?!
Yup. That's right. You've been a good boy (or girl) and annotated your typed dataset XSD with codegen:nullValue attributes to instruct the codegenerator in how to handle DBNull values. And you actually thought the MSDataSetGenerator would care? Well it does, if you add the minOccurs="0" aswell. Otherwise nothing happens.
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Typed DataSets with many to many relationships
Ever wondered how to construct multitable DataSets in a proper manner? Whether to use one dataadapter or several? Just found this one on MSDN:
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Should the struggle for OR mapping continue?
Paul Gielens is struggeling with OR mapping:
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CMP & JDO Compared
It's always interesting checking out what they are doing on the other side of the fence. David Jordan and Craig Russel compares the two emerging persistence mechanisms on the java platform : Container Managed Persistence and Java Data Objects. The exerpt is found on O'Reilly.
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Remoting Typed Datasets - the tryouts
Andres stepped up quickly with some hints to my previous blogentry. I tried out the ADO.NET Powertoys which contained several features. Because it was poorly documented, and I just needed one of the features, I think I'll wait for a later release.
I could have given DeKlarit a shot, but I simply like fiddeling with architecture too much to give away everything to a framework:) -
Aren't Typed Datasets XSD really Contracts?
Roy found the xsd tool recently and got the typed datasets to scale. I still don't like them.
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Prevalence is cool
I think prevalence is cool. Why? Because it's such an "unthinkable" concept. It's almost tabu. I like the lightly smug attitude of the guys at Prevayler.org because they have actually created something based on this idea and are provocative enough for the RDBMS crowd to actually come up with good arguments.
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Persist through winter
Another exiting Java based project is going .NET. I've done a lot of reading on persitance frameworks and OR mapping lately and Hibernate is definately getting a go. Firstly in Java, but hopefully the guys at the NHibernate project can get something going aswell.. Read more at Edgar Sanchez's blog