schema_spec: connect to service via service name
schema_spec: connect to service via service name

Use DATABASE_SERVICE_NAME instead of DATABASE_NAME when connecting to
database service directly (i.e. not via TNS).

yahonda/ruby-plsql,jgebal/ruby-plsql,JDominator/ruby-plsql,JDominator/ruby-plsql,jgebal/ruby-plsql,rsim/ruby-plsql,rsim/ruby-plsql,yahonda/ruby-plsql,jgebal/ruby-plsql