code: public static <T> T queryScalar(String sql, Class<T> scalarType, Object[] params)
        throws SQLStatementNotFoundException, YankSQLException {
  
      return queryScalar(YankPoolManager.DEFAULT_POOL_NAME, sql, scalarType, params);
    }
docs: Return just one scalar given a an SQL statement using the default connection pool.
  
  @param scalarType The Class of the desired return scalar matching the table
  @param params The replacement parameters
  @return The scalar Object
  @throws SQLStatementNotFoundException if an SQL statement could not be found for the given
  sqlKey String