Question

For example, there is an entity “User” with @ManyToOne(fetch=Lazy) field “Team”. I have used entityManager.find(User.class, userId) get a user. At this point, if I call user.getTeam() a query will be send to database to get team object. Is there a way to get the team id without extra query?

Answer 1

For these purposes I do map the column twice. Once as many-to-one with insert="true" and update="true".

then I append an TeamId property and mapp it as int insert="false" and update="false". Instead of column mapping I use formula.

TeamId is then available after the first select.