Write-back cache (lazy write) and ActiveRecord

There are afaik several ways to do multi-record operations on DB.
Mileage of course varies depending on DMBS.

Is AR capable of folding multi-record modifications (inserts, deletes
or updates) to single SQL statement? Interface I had in mid was
something like

with_lazy_write do
massive_data.each { |item| MyModel.create_from(item) }
end

which (depending on DB adapter) could boil down to something like
these

INSERT INTO my_models SELECT … UNION SELECT … UNION SELECT …
INSERT INTO my_models VALUES (…), (…), (…), (…), (…), …


Tero

On 7 Aug 2008, at 12:46, Tero T. wrote:

There are afaik several ways to do multi-record operations on DB.
Mileage of course varies depending on DMBS.

Is AR capable of folding multi-record modifications (inserts, deletes
or updates) to single SQL statement? Interface I had in mid was
something like

Not that I know of.

Fred

Am I missing something or am I just the only one who needs to optimize
multi-record modifications? :slight_smile:

For bulk inserts there’s ar-extensions.

Here’s a blog post:
http://rubypond.com/articles/2008/06/18/bulk-insertion-of-data-with-activerecord/

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