SpringData : is it possible to have subqueries in the Query annotation?

Question

I would like to know if it is possible to have subquery in a @Query annotation (org.springframework.data.jpa.repository.Query;)

I am getting a QuerySyntaxException o

Answer 1

The content of the @Query annotation is more or less passed as is to the persistence provider by calling EntityManager.createQuery(…). So whatever is allowed in there can be used in @Query. AFAIK, JPQL (by the time of JPA 2.0) only supports subqueries for EXISTS and IN clauses.

Answer 2

No, it is not possible to have subquery in the select clause in JPQL query.

JPQL supports subqueries in WHERE and HAVING clauses. It can be (at least) part of ANY, SOME, ALL, IN, EXIST expressions, and of course it can be used normal conditional expressions:

SELECT a
FROM A a
WHERE a.val = (SELECT b.someval 
               FROM B b 
               WHERE b.someotherval=3)

Answer 3

I did get expected results in Spring-data jpa with

public final static String FIND_BY_ID_STATE = "SELECT a FROM Table1 a RIGHT JOIN a.table2Obj b " +
                                              "WHERE b.column = :id" +
                                              "AND a.id NOT IN (SELECT c.columnFromA from a.table3Obj c where state = :state)";


@Query(FIND_BY_ID_STATE)
public List<Alert> findXXXXXXXX(@Param("id") Long id, @Param("state") Long state);

where

Table2Obj & Table3Obj are the mapping of the relationship between entities Table1 and Table2, Table3 respectively.

defined Like below.

@OneToMany(mappedBy = "xxx", fetch = FetchType.LAZY)
private Set<Table2> table2Obj = new HashSet<>();