AlexGuti AlexGuti - 2 months ago 36
MySQL Question

Affected rows for ActiveRecord::Base.connection.execute

With Rails 4.1.1, using mysql2 adapter:

I am using an ActiveRecord

to execute a multiple insert in a MySQL table:

ActiveRecord::Base.connection.execute %Q{
INSERT INTO table (`user_id`, `item_id`)
SELECT 1, id FROM items WHERE items.condition IS NOT NULL
}


This works fine, do the job, and returns
nil
.

Is there a way to get the number of affected rows?
(avoiding the need to execute another query)

I have found the documentation of the
execute
method somewhat sparse.

Answer

Here is an easy way to get the number of affected rows using the mysql2 adapter. Put this in a file that gets loaded by your app:

class ActiveRecord::ConnectionAdapters::Mysql2Adapter
  def affected_rows
    @connection.affected_rows
  end
end

Then you will be able to run ActiveRecord::Base.connection.affected_rows to get the number of affected rows.

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