Spring Data JPARepository: How to conditionally fetch children entites

Question

How can one configure their JPA Entities to not fetch related entities unless a certain execution parameter is provided.

According to Spring\'s documentation, 4.3.9

Answer 1

You can use @Transactional for that.

For that you need to fetch you account entity Lazily.

@Transactional Annotations should be placed around all operations that are inseparable.

Write method in your service layer which is accepting one flag to fetch contacts eagerly.

@Transactional
public Account getAccount(String id, boolean fetchEagerly){
    Account account = accountRepository.findOne(id);

    //If you want to fetch contact then send fetchEagerly as true
    if(fetchEagerly){
        //Here fetching contacts eagerly
        Object object = account.getContacts().size();   
    }
}

@Transactional is a Service that can make multiple call in single transaction without closing connection with end point.

Hope you find this useful. :)

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