On 24/03/11 11:13 PM, Israel Ben Guilherme Fonseca wrote:
Hello,
Maybe what I'm asking don't make sense to the Datamapper context, but
here it goes:
In SQLAlchemy and Hibernate there's the concept of session context,
where an IdentityMap have references to the entities that are attached
in the the current session context. In these frameworks you have to
eventually make a session.clear() or session.close(). You normally use a
clear() in Hibernate to make batch inserts.
Anyway, my question is: is there any similar concepts in datamapper? I
didnt find anything in the docs. If i had a DAO like this:
class PessoaDAO
def insert(pessoa)
pessoa.save
end
end
I could call this 1 million times without the fear of filling my system
memory?(Without a clear this would happen in hibernate, and without
autocommit i think that too would happen in SQLAlchemy.
The identity map is only used when you are explicitly inside a
repository block:
DataMapper.repository(:default) do
# Identity map used here
end
# Cleared by here, and not used anymore
If you called 1 million inserts inside the block, then yes your memory
would fill up.
If you are using datamapper with rails and insert the identity map
middleware, you get an identity map for the scope of one request.
Hope that helps,
Xavier
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