The Java EE 5 Tutorial

Traversing Multiple Relationships

FROM Player p, IN (p.teams) t
WHERE t.league = :league

Data retrieved: The players that belong to the specified league.

Description: The expressions in this query navigate over two relationships. The p.teams expression navigates the Player-Team relationship, and the t.league expression navigates the Team-League relationship.

In the other examples, the input parameters are String objects, but in this example the parameter is an object whose type is a League. This type matches the league relationship field in the comparison expression of the WHERE clause.