Mini-Guide: NHibernate. Sanjiv Jivan's Blog. Hibernate Search runs over Lucene and allows you to annotate member's of your domain model classes that you'd like to have automagically indexed.
It then gives you the ability to query the index and retrieve managed objects using the Hibernate query API's. So in essence you're querying using the domain model and not the database tables as you'd normally do when working directly with Lucene. Sounds pretty cool, but what is the problem they're tying to solve? Their site states that it "brings the power of full text search engines to the persistence domain model". But what is the use case they're trying to address? Let walk through a common use case where you have a web application and you want to provide full text search capabilities. Annotate all your data model classes so that the fields of interest are automagically indexed by Hibernate. I see several problems with this approach : I dont think it is suitable for high volume internet sites for the reasons mentioned above. No Relation To...: Hibernate Search - cool, but is it the right approach? Year baby!
Can you spot the problem?
I am working on Hibernate Search's ability to provide field bridge autodiscovery. I am usually pretty OK at getting a green bar on first run but I got out of luck today. Can you spot the problem? Let me zoom a bit for you. Caused by: java.lang.ClassCastException: [Ljava.util.Date; cannot be cast to java.util.Date What? Hibernates bizarre interpretation of inverse ;), 25/04/06, Colin's blog. Writing about web page hibernate.org So my colleague asked me about the exact semantics of hibernate's "inverse" keyword which is surely the worst choice of word for a simple concept.
Essentially "inverse" indicates which end of a relationship should be ignored, so when persisting a parent who has a collection of children, should you ask the parent for its list of children, or ask the children who the parents are? Why does this matter? Well if you are stupid then you might do something like: Parent parentA = new Parent(); Parent parentB = new Parent(); Child child = new Child(); parentA.getChildren().add(child); child.setParent(parentB); how should hibernate persist this situation? What does it mean to be inverse? Or at least that is what you would think :) First moan is why use the word "inverse"? The second moan is that hibernate isn't consistent.
It is such a simple concept, but so many people seem to struggle with it. Introducing HQL: The Object-Oriented Query Language from Hibernate. Complete Hibernate Tutorial. NHibernate Helper Kit - The Code Project - .NET. Introduction Here is a tool for the use of your own applications that NHibernate.
You can easily install and use this helper kit. To download, please click the link at the top of the page. If you are using NHibernate, you need to write a lot of persistent classes and XML mapping for each persistent class. Also, you need to write the NHibernate config file. Installing After you download the installation files, unzip the file and open the folder. Setup.exe (shortcut): You can install the add-in via this installer.
Open setup.exe and you will see the following interface: Click Run, and it will install itself; it will take a few seconds. Using After the installation, run Visual Studio 2005 and go to the Tools menu. Connection: This screen allows you to connect your database with connection parameters. Tables & Columns: This screen allows you to browse a selected database's tables and select them to create files. Generate: At the end of this, we can start the generate process. Persistent class. NHibernate - Part 2. NHibernate.