# File lib/dm-migrations/adapters/dm-oracle-adapter.rb, line 30 def sequence_exists?(sequence_name) return false unless sequence_name statement = DataMapper::Ext::String.compress_lines("SELECT COUNT(*)\nFROM all_sequences\nWHERE sequence_owner = ?\nAND sequence_name = ?\n") select(statement, schema_name, oracle_upcase(sequence_name)).first > 0 end