CODEWITHSUNDEEP
nhibernatedata-access-layer
0lukasz0
0lukasz0

Reputation: 3267

Session evict and merge for entity update

I found this piece of code: 

    public virtual void Update(T entity) {
        Logger.Debug("Update {0}", entity);
        Session.Evict(entity);
        Session.Merge(entity);
    }

Can you explain what are pros and cons of calling this over calling update on session? Why is this working, what are mechanics behind this code? Is it not too hacky?

Upvotes: 0

Views: 1460

Answers (1)

Felipe Oriani
Felipe Oriani

Reputation: 38618

Session.Evict will evicts a single object from the session, for sample, if you already have an obj on the session and you try to call session.Update(entity) you will get an exception saying that this obj is on the session and you cannot update.

Session.Merge will merge an single object with the existent object on the session (cache) and update.

take a look: https://stackoverflow.com/a/9161057/316799

Upvotes: 1

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