In dbi.rb, select_one is defined like this:
def select_one(stmt, *bindvars)
raise InterfaceError, "Database connection was already closed!"
if @handle.nil?
row = nil
execute(stmt, *bindvars) do |sth|
row = sth.fetch
end
row
end
Should this invoke cancel after invoking fetch, to clobber the result
set, in case there are more rows than one and fetch doesn't invoke
cancel implicitly?
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