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Author Archives: hedleyproctor
Hibernate query limitations and correlated sub queries
It’s well known that one of the key limitations of writing queries in Hibernate, using either HQL or criteria, is that you cannot write queries that have a join in the from clause. What is less well known is that … Continue reading
Bespoke join conditions with Hibernate JoinFormula
Recently someone posted a question on stackoverflow asking how to deal with a database join, where the foreign key could reside in one of two different columns. This situation is sometimes found in a legacy database schema, where someone has … Continue reading
Hibernate example 4 – many to many associations
I’ve put some code on Github that shows three ways of modelling many to many associations with JPA / Hibernate: Using a join table that is not mapped as either an entity or an embedded component type. Mapping the join … Continue reading
Hibernate example 3 – one to one associations
Just put a Hibernate example of the three different ways to create one-to-one associations on github: https://github.com/hedleyproctor/hibernate-one-to-one It contains a Customer entity, which has one-to-one associations to a UserProfile, MarketingPreferences and a Wistlist. Foreign key relationship. Customer has a foreign … Continue reading
Hibernate example 2 – one-to-many associations
Just put an example of how to use one-to-many associations with Hibernate on Github: https://github.com/hedleyproctor/hibernate-one-to-many Shows two examples of a one-to-many relationship between entities: Unordered one-to-many between Customer and Address. Ordered one-to-many between Customer and PaymentCard. The unordered association uses … Continue reading
Hibernate example 1 – inheritance and polymorphism
Have just put an example on Github of how to handle inheritance and polymorphism with Hibernate: https://github.com/hedleyproctor/hibernate-polymorphism It demonstrates the four ways of dealing with inheritance and polymorphism: Implicit polymorphism – no explicit mapping of the inheritance, but Hibernate can … Continue reading
Using database transactions with Apache Camel
Just put an example of using database transactions with Apache Camel on github: https://github.com/hedleyproctor/camel-transaction-example It is based on the example given at the start of Chapter 12 of “Camel In Action”, but using database transactions, rather than a JMS transaction. … Continue reading
Testing Camel routes with Spring OSGi properties
If you are writing Camel routes using Spring to deploy to ServiceMix, you can’t use regular Spring properties, since ServiceMix is an OSGi container. Instead, you have to use OSGi properties. But if you try to start up your Spring … Continue reading
Practical Scala – processing XML
This is the second article in my series Practical Scala. The first article covered the basics of Scala syntax and then moved on to file IO and regular expressions. This article will show you how to read and write XML. … Continue reading
Practical Scala – file IO and regular expressions
Scala is a great language but learning it can seem like you’re battling with too many new concepts to be able to get anything done. The purpose of this article is to show that even with a few lines of … Continue reading