If the Statement object has CONCUR_READ_ONLY concurrency,
then this method will return ResultSet.CONCUR_READ_ONLY. But if the
Statement object has CONCUR_UPDATABLE concurrency, then the return
value will depend on whether the underlying language ResultSet is updatable
or not. If the language ResultSet is updatable, then getConcurrency() will
return ResultSet.CONCUR_UPDATABLE. If the language ResultSet is not
updatable, then getConcurrency() will return ResultSet.CONCUR_READ_ONLY.