Hibernate Tips is a new series of posts in which I describe a quick and easy solution for common Hibernate questions. If you have a question you like me to answer, please leave a comment below. Question: How do you configure Hibernate so that it writes the executed SQL statements and used bind parameters to…
Representing associations between entities as attributes is one of the most comfortable and popular features of JPA and Hibernate. It makes it very easy to navigate from one entity to one or more associated entities in your Java code, like from a Person entity to the corresponding Address entity. You can also use the association…
JPA supports a set of database functions which you can use to perform small operations and transformations within a query. This is often easier and faster than doing it in the Java code. But how do you call functions which are not supported by the JPA standard, like database-specific ones or the custom functions implemented…
Defining a static named query via the @NamedQuery annotation is the most common way in JPA. It has the main advantage that the persistence provider can compile and validate the query at start-up time. But you also have to define the query statically at compile time. OK, you can still define a dynamic query at runtime but how do you…
When you write a criteria query or create a dynamic entity graph, you need to reference the entity classes and their attributes. The quickest and easiest way is to provide the required names as Strings. But this has several drawbacks, e.g. you have to remember or look-up all the names of the entity attributes when you write the query….
