code: private static DatabaseType getDatabaseType(String dbtype) {
      if (dbtype.equals("h2"))
        return DatabaseType.H2;
      else if (dbtype.equals("oracle"))
        return DatabaseType.ORACLE;
      else if (dbtype.equals("mysql"))
        return DatabaseType.MYSQL;
      else
        throw new DukeConfigException("Unknown database type: '" + dbtype + "'");
    }
docs: ===== DATABASE TYPES