The JPA spec does not allow aliasing a fetch join, but some JPA providers do. EclipseLink does as of 2.4. EclipseLink also allow nested join fetch using the dot notation (i.e. “JOIN FETCH a.bs.c”), and supports a query hint “eclipselink.join-fetch” that allows nested joins (you can specify multiple hints of the same hint name). In … Read more
You might want to try one of the following ways: Using the method createNativeQuery(sqlString, resultClass) Native queries can also be defined dynamically using the EntityManager.createNativeQuery() API. String sql = “SELECT USER.* FROM USER_ AS USER WHERE ID = ?”; Query query = em.createNativeQuery(sql, User.class); query.setParameter(1, id); User user = (User) query.getSingleResult(); Using the annotation @NamedNativeQuery … Read more
Are you using Hibernate’s Query object, or JPA? For JPA, it should work fine: String jpql = “from A where name in (:names)”; Query q = em.createQuery(jpql); q.setParameter(“names”, l); For Hibernate’s, you’ll need to use the setParameterList: String hql = “from A where name in (:names)”; Query q = s.createQuery(hql); q.setParameterList(“names”, l);
Although you are getting valid results, the SQL query fetches all data and it’s not as efficient as it should. So, you have two options. Fixing the issue with two SQL queries that can fetch entities in read-write mode The easiest way to fix this issue is to execute two queries: . The first query … Read more
The JPA spec (Version 2.0, 2.1 and 2.2 at least) doesn’t allow the use of collections as parameters in constructor expressions. Section 4.8 defines a constructor expression like this: constructor_expression ::= NEW constructor_name ( constructor_item {, constructor_item}* ) constructor_item ::= single_valued_path_expression | scalar_expression | aggregate_expression | identification_variable A single_valued_path_expression is what it sounds like – … Read more
Your JPQL is invalid, remove the brackets List<String> logins = em.createQuery(“SELECT a.accountManager.loginName ” + “FROM Account a ” + “WHERE a.id IN :ids”) .setParameter(“ids”,Arrays.asList(new Long(1000100), new Long(1000110))) .getResultList();
The syntax of your JPQL query is incorrect. Either use (with a positional parameter): List<Long> ids = Arrays.asList(380L, 382L, 386L); Query query = em.createQuery(“FROM TrackedItem item WHERE item.id IN (?1)”); query.setParameterList(1, ids) List<TrackedItem> items = query.getResultList(); Or (with a named parameter): List<Long> ids = Arrays.asList(380L, 382L, 386L); Query query = em.createQuery(“FROM TrackedItem item WHERE item.id … Read more
Instead of root.join(…) you can use root.fetch(…) which returns Fetch<> object. Fetch<> is descendant of Join<> but it can be used in similar manner. You just need to cast Fetch<> to Join<> it should work for EclipseLink and Hibernate … Join<MyEntity, RelatedEntity> join = (Join<MyEntity, RelatedEntity>)root.fetch(“relatedEntity”); …
You are experiencing this issue for two reasons. The JPQL Query is not valid. You have not created an association between your entities that the underlying JPQL query can utilize. When performing a join in JPQL you must ensure that an underlying association between the entities attempting to be joined exists. In your example, you … Read more
The only dynamic parameter Spring JPA supports is #{#entityName}. Dynamic column names in @Query annotations are not supported., and that is what you are trying to accomplish. Your only option is to construct a query manually using either QueryDSL, Specifications or Criteria API or simply by building a query string and passing it to your … Read more