![]() If you enjoyed this article, I bet you are going to love my Book and Video Courses as well.Īs demonstrated, Hibernate is very flexible, allowing you to customize the way entity properties are automatically generated. Great! The sensor records were updated properly and the updated_by column captures the user who made the modification. ![]() Hibernate generates the following SQL UPDATE statements: The GenerationTime.ALWAYS strategy of the updatedBy property triggers the ValueGenerator for both INSERT and UPDATE.Bob’s INSERT is executed first since he has committed (and flushed) his changes first.There are several observations we can make here: When running the test case above, Hibernate generates the following SQL INSERT statements: In the main thread, Alice logs in and inserts the ip sensor while, in a different thread, Bob’s logs in and inserts the temperature sensor. To see how the createdBy property is populated when the entity is persisted, consider the following test case: The when attribute of the annotation tells if the entity property should be assigned when the entity is persisted (e.g. Getters and setters omitted for brevityĪs you can see, the allows us to map the createdBy and updatedBy properties so that Hibernate uses the LoggedUserGenerator to assign the annotated entity property using the currently logged user. Private String = LoggedUserGenerator.class, ![]() Now, we only need to instruct Hibernate to use the LoggedUserGenerator for the createdBy and updatedBy properties of our Sensor = "sensor") With the ValueGenerator interface, Hibernate allows us to customize the way a given entity property is going to be generated. Implements ValueGenerator String generateValue( Now, we want to pass the currently logged user to the createdBy and updatedBy properties of our Sensor entity, To do so, we will create the following ValueGenerator Hibernate utility: Populating entity properties with the currently logged user Public class LoggedUserFilter implements Filter void init( In a web application Servlet Filter, the LoggedUser.logIn method can be called using the currently authenticated user, and the LoggedUser.logOut method is called right after returning from the inner FilterChain.doFilter invocation. Private static final ThreadLocal userHolder = If the name can be mapped as the entity and the value is just a property, how can we automate the created_by and updated_by columns using the currently logged user? Currently logged userįor test sake, let’s assume we have the following ThreadLocal utility which stores the currently logged user: If you’re not using Spring Data, then you can easily emulate the same behavior using the Hibernate-specific annotation and the ValueGenerator callback mechanism.Īssuming we have the following sensor table in our relational database: If you’re using Spring Data, you can simply use the and annotations and the annotated entity properties are going to be populated with the currently logged user. One such example is the annotation which allows you to customize the way a given entity property value is automatically generated. Hibernate comes with many additions to the standard JPA specification. So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night! Well, Hypersistence Optimizer is that tool!Īnd it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework. ![]() Follow having a tool that can automatically detect JPA and Hibernate performance issues. ![]()
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