CODEWITHSUNDEEP
hibernatehql
Grim
Grim

Reputation: 2097

How to write a HQL query for a many to many association

So I have spent several hours trying to write a HQL query for a many to many relationship. With all the queries that I have tried nothing worked even after reading the hibernate docs. Can someone please assist me? Thank you in advance.

I have tried inner join, join and outer join with or without fetch. I think the issue may be related to the one to many relationship within the fragrance class.

@Query("FROM Category c INNER JOIN FETCH c.fragrances f WITH c.referencedId = 1")
List<Category> getCatalog();

Category Class without get/setters

@Entity
public class Category extends AbstractEntity {

   @Column(name = "name", nullable = false)
   private String name;

   @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
   @JoinTable(name = "Category_has_Fragrance",
        joinColumns = @JoinColumn(name = "category_id"),
        inverseJoinColumns = @JoinColumn(name = "fragrance_id")
   )
   @OrderBy("name")
   private List<Fragrance> fragrances;

   @Column(name = "referenced_id", nullable = false)
   private int referencedId;
]

Fragrance Class without get/setters

@Entity
public class Fragrance extends AbstractEntity {

    @Column(name = "name", nullable = false)
    private String name;

    @Column(name = "description", nullable = false)
    private String description;

    @ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "fragrances")
    private Set<Category> categories;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, mappedBy = "fragrance")
    private List<FragrancedProduct> fragrancedProducts;

    @Column(name = "image_path")
    private String imagePath;
}

Upvotes: 0

Views: 3724

Answers (1)

Carlos Laspina
Carlos Laspina

Reputation: 2231

Try this: 

select c from Category c join c.fragrances f where c.referencedId = :id

You can check a similar question here: How do I do with HQL, many to many?

Upvotes: 1

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