HQL query for non-standard ManyToMany relationship

Question

I have ManyToMany relationship between Author and Book .
table : AUTHOR
id | name

table : ASSIGN
*id | author_id | book_id*

table : BOOK
id | title

But I am using not standart ManyToMany mapping, I am using next

class Book
{
   @Id
   long id;

   String title;

   @OneToMany
   List<Assign> authors;
}

class Assign
{
   @Id
   long id;

   @ManyToOne
   Book book

   @ManyToOne
   Author author;
}

class Author
{
   @Id
   long id;

   String name;

   @OneToMany
   List<Assign> books;
}  

What is query to get all Books for Author's name? Also What is query to get all Books' names for Author's name?

Answer 1

You simply have two OneToMany associations. You just need to use joins in your query, as described in the Hibernate documentation over HQL .

select book from Author author 
left join author.books assign
left join assign.book book
where author.name = :name

The second query is the same, except you just want the book names:

select book.name from Author author ...

Side note: you shouldn't name your collection of Assigns books or authors : it's very confusing. Name it assigns .

Answer 2

What is query to get all Books for Author's name?

from Book b order by b.authors.author.name

What is query to get all Books' names for Author's name?

select b.title from Book b order by b.authors.author.name

Have you swapped title and name in Author and Book classes?