CODEWITHSUNDEEP
javaspringhibernate
membersound
membersound

Reputation: 86905

How to update an entity in DB effectively?

I want to update an entity in the database whenever the entity in my application contains data that is different from the DB entity.

My update method is as follows:

    @Transactional
    public void updateEntity(String a, String b, boolean c, Date d) { //some more params
        MyEntity entity = dao.findEntityBy(a, b, c); //might be some more params
        //nullcheck

        if (!entity.getA().equals(a)) {
            entity.setA(a);
        }
        if (!entity.getB().equals(b)) {
            entity.setB(b);
        }
        //repeat per property... a-n

        dao.save(entity);
    }

Question: Should I check each attribute of the entity if it has changed and then only use the setter? Or should I just skip the checks and just override the entity?

MyEntity entity = dao.findEntityBy(a, b, c);
entity.setA(a);
entity.setB(b);
//...
dao.save(entity);

What is the perfered way? What are (dis)advantages of either solution?

Upvotes: 1

Views: 93

Answers (2)

Andy Dufresne
Andy Dufresne

Reputation: 6190

In case you have many attributes, you can use the dynamic-update=true to optimize the performance. The dynamic-update attribute tells Hibernate whether to include unmodified properties in the SQL UPDATE statement.

It can be configured as 

@Entity
@Table(name = "MY_ENTITY")
@org.hibernate.annotations.Entity(
        dynamicUpdate = true
)
public class MyEntity {
}

Upvotes: 3

Marcin Szymczak
Marcin Szymczak

Reputation: 11453

Pretty much in every "production ready" software you can see second version

MyEntity entity = dao.findEntityBy(a, b, c);
entity.setA(a);
entity.setB(b);
//...
dao.save(entity);

To be honest I don't see added value in first option (but added maintenance and lower readability can be seen).

Upvotes: 2

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