NativeQuery是更好的还是HibernateOGM方法

Question

I am using hibernate OGM to talk to my MongoDB instance. I had to get a list of all the products with category "abc" . I am using the native query approach to achieve this as following:

String stringQuery = "db.Message.find({'CATEGORY':'" + category + "})";
Query query = entityManagerProvider.get().createNativeQuery(stringQuery, Product.class);
productList = query.getResultList();

I am not sure if it is the right approach to do this as I see a too much hard coding (look at the collection name). Can I use the .find() method to achieve the same thing? We are using vertx server with gradle as building tool.

Answer 1

Do you mean the EntityManager.find() ? You can use it if you filter using the primary key. It doesn't seem the case in your example.

What you can do is write a JP-QL query:

productList = entityManagerProvider.get().createQuery( "SELECT p FROM Product p WHERE p.category=:category", Product.class ).setParameter("category", category).getResultList();

I'm assuming that you have an entity Product with attribute category .