An INNER JOIN can return data from the columns from both tables, and can duplicate values of records on either side have more than one match. A LEFT SEMI JOIN can only return columns from the left-hand table, and yields one of each record from the left-hand table where there is one or more matches … Read more
Try this: public interface LimitRepository extends JpaRepository<CLimit, Long> { @Modifying @Query(“delete from CLimit l where l.trader.id =:#{#trader.id}”) void deleteLimitsByTrader(@Param(“trader”) CTrader trader); } Whenever you are trying to modify a record in db, you have to mark it as @Modifying, which instruct Spring that it can modify existing records. The modifying queries can only use void … Read more
This was posted on the Hibernate forum a few years back when asked about why this worked in Hibernate 2 but not in Hibernate 3: Limit was never a supported clause in HQL. You are meant to use setMaxResults(). So if it worked in Hibernate 2, it seems that was by coincidence, rather than by … Read more
In this two queries, you are using JOIN to query all employees that have at least one department associated. But, the difference is: in the first query you are returning only the Employes for the Hibernate. In the second query, you are returning the Employes and all Departments associated. So, if you use the second … Read more
I mostly prefer Criteria Queries for dynamic queries. For example it is much easier to add some ordering dynamically or leave some parts (e.g. restrictions) out depending on some parameter. On the other hand I’m using HQL for static and complex queries, because it’s much easier to understand/read HQL. Also, HQL is a bit more … Read more