Hibernate: Select entities where collection contains all of the specified valus

Question

I need assistance with a tricky hibernate query problem. I have the following entities:

public class Book {
   private String bookId;
   private String autho         


        

Answer 1

The accepted answer from JB Nizet is good but will not work if your collection can contain duplicates (might be a valid reason for that, probably not with the tag example though).

Lets say the collection for some books can contain duplicate tags with the same name "MyTag". Then a search for the Tags "MyTag", "YourTag" could return books that have 2 "MyTag" tags but no "YourTag" tag.

select b from Book b where :numberOfTags = (select count(distinct tag.tagName) from Book b2 inner join b2.tags tag where b2.id = b.id and tag.tagName IN (:tagNames)) 

As I said nothing wrong with the accepted answer but if you need to support duplicates in the collection then you need to add count(distinct tag.name)