I have a problem in selecting all rows within 3 tables in JPQL. I want to return it as a Collection<Object>
.
protected Collection<Object> getRecords(){
emf = Persistence.createEntityManagerFactory("MyPersistenceUnit");
em = emf.createEntityManager();
em.getTransaction().begin();
TypedQuery<Object> query = em.createQuery("SELECT * FROM Vehiclehistory As h INNER JOIN Vehicles As v ON h.vehicleID = v.vehicleID INNER JOIN Clients As c ON h.clientID = c.clientID",Object.class);
Collection<Object> list = query.getResultList();
em.getTransaction().commit();
return list;
}
The error showing is :
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: An exception occurred while creating a query in EntityManager:
Exception Description: Syntax error parsing [SELECT * FROM Vehiclehistory As h INNER JOIN Vehicles As v ON h.vehicleID = v.vehicleID INNER JOIN Clients As c ON h.clientID = c.clientID].
[138, 138] A select statement must have a FROM clause.
[7, 7] The left expression is missing from the arithmetic expression.
[9, 138] The right expression is not an arithmetic expression.
Is it the query? Should I use createQuery or createNativeQuery? Or Should I use Query only not TypedQuery?
Thank you.
Thanks to this link : INNER JOIN IN JPQL
Like for example:
SELECT v.[vehicleinfo] FROM Vehiclehistory AS h INNER JOIN h.vehicleID AS v ON h.vehicleID = v.vehicleID
h.vehicleID as v
it only tells that i need to reference first the foreign key from the left table and give it an alias so that i may easily call it and use it in ON
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