What is ResultTransformer in hibernate?
Hibernate implements JPA’s standardized constructor expressions and @SqlResultSetMappings to map the results of your queries. And it also supports proprietary ResultTransformers. They provide a powerful and flexible way to map the result of your JPQL, Criteria, and native SQL query to a specific object structure.
Why is Setresulttransformer deprecated?
4 Answers. The ResultTransformer comes with a legacy definition which is not following the Functional Interface syntax. Hence, we cannot use a lambda in this example. Hibernate 6.0 aims to overcome this issue, so that’s why the Hibernate ORM 5.2 ResultTransformer is deprecated.
How do you map native query results to pojo?
First declare your native query, then your result set mapping (which defines the mapping of the data returned by the database to your POJOs). Write your POJO class to refer to (not included here for brevity). Last but not least: create a method in a DAO (for example) to call the query.
What is the latest hibernate version?
Hibernate (framework)
| Developer(s) | Red Hat |
|---|---|
| Initial release | 23 May 2001 |
| Stable release | 5.6.0.Final / October 13, 2021 |
| Preview release | 6.0.0.Beta1 / October 11, 2021 |
| Repository | github.com/hibernate/hibernate-orm |
What is addScalar in hibernate?
addScalar method specifies the result of the query to return objects for individual named columns, rather than entities.
Is SQL HQL?
Hibernate Query Language (HQL) is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects and their properties. HQL queries are translated by Hibernate into conventional SQL queries, which in turns perform action on database.
How do you map native query results to entities?
There are 2 options to define the mapping:
- You can use an implicit mapping if your query result uses the same column names as your entity mapping.
- You can create your own mapping if the column names do not match the entity mapping.
Is the resulttransformer deprecated in hibernate 5?
ResultTransformers were especially popular with Hibernate 4 but got deprecated in Hibernate 5. Unfortunately, Hibernate 5 doesn’t provide an alternative for them. Due to that, it might look like ResultTransformer would be removed in Hibernate 6. But that’s not the case!
Can a result mapping annotation be used in JPA?
Additionally, the result mapping annotations (or XML configuration) of the JPA standard can be used to map the results of multiple queries. Another and more powerful way to transform the query result is ResultTransformer.
When to use the sqlresultsetmapping annotation in hibernate?
The SqlResultSetMapping annotation is repeatable and is applied at the entity class level. Apart from taking a unique name, which is used by Hibernate to register the mapping, there are three mapping options:
Can a resulttransformer be used in a JPQL query?
Although the aforementioned example used a JPQL query, the ResultTransformer can also be applied to Criteria API or native SQL queries, so it’s not limited to JPQL queries only. If you enjoyed this article, I bet you are going to love my Book and Video Courses as well.