JPQL join 用于渴望获取关联

Question

Say I have entity A that is the parent with @OneToMany association to entity B. Also say I set fetch mode to eager. So when I use a JPQL to fetch my entities A base on some filter do I need to use join in order to get its children?

Answer 1

You have to use join when children are part of the query, for example:

select p 
from parent p 
inner join p.children c 
where c ...

but you don't have to use fetch before join to initialize entities.