Read uncommitted is impossible under Firebird

[gsbelarus]

There is no way in Firebird that one transaction will see any UNCOMMITTED changes made by other transactions. So, the name ISOLATION_READ_UNCOMMITTED is incorrect.

const
    ISOLATION_READ_UNCOMMITTED          = [isc_tpb_version3, isc_tpb_write, isc_tpb_wait, isc_tpb_read_committed, isc_tpb_rec_version],
    ISOLATION_READ_COMMITED             = [isc_tpb_version3, isc_tpb_write, isc_tpb_wait, isc_tpb_read_committed, isc_tpb_no_rec_version],