JPA Criteria API and 'in' keyword
Sergei Zhylinski
Ranch Hand
Posts: 87
1
posted 1 year ago
Hi Everyone,
I am learning Criteria API, particularly the 'in' keyword. Possible usages of this keyword in JPQL in 'where' clause are:
1. to check whether a single-valued path expression is a member of a collection ("select e from Employee e where e.age in (23, 24, 25)")
2. in a subquery (select e from Employee e where e.department in ("select d from Department d where d.name = 'Personnel Department')")
The 'in' keyword can also be used with the 'from' keyword where it represents a member of the collection in the multivalued association (i.e. one-to-many). A sample JPQL query is like this "select d, e from Department d, in(d.employees) e". Found in Java EE tutorial
The first two cases are quit straightforward to write via Criteria API. Could someone please advise, how to write the third query using Criteria API?
I am learning Criteria API, particularly the 'in' keyword. Possible usages of this keyword in JPQL in 'where' clause are:
1. to check whether a single-valued path expression is a member of a collection ("select e from Employee e where e.age in (23, 24, 25)")
2. in a subquery (select e from Employee e where e.department in ("select d from Department d where d.name = 'Personnel Department')")
The 'in' keyword can also be used with the 'from' keyword where it represents a member of the collection in the multivalued association (i.e. one-to-many). A sample JPQL query is like this "select d, e from Department d, in(d.employees) e". Found in Java EE tutorial
The first two cases are quit straightforward to write via Criteria API. Could someone please advise, how to write the third query using Criteria API?
