get going to be executed query before execution on ActiveRecord::Base

I want to copy old_db.table data to new_db.table.

I used ActiveRecord::Base.connection.execute(sql) this method for executing my insertion query. That perfectly insert data to new_db.table . But I want to get the query before actual execution.

sql = "insert into `#{new_db}`.#{table} #{f} (select * from #{old_db}.#{table});"
ActiveRecord::Base.connection.execute(sql)

For example I want print "insert into new_db.table values(value1, value2, value3, ...)" something like this, the row-wise execution of my query. How can I do that?