Metacat

                query = "select guid from systemmetadata where docid = ? and rev = ?";

                stmt = dbConn.prepareStatement(query);

                stmt.setString(1, docid);

                stmt.setInt(2, rev);

                rs = stmt.executeQuery();

                if(rs.next())

                {

                    guid = rs.getString(1);

                }

                else

                {

                    throw new McdbDocNotFoundException("No guid registered for docid " + docid + "." + rev);

                }