code: public List<Extensions> queryByExtension(String extensionName)
  			throws SQLException {
  
  		QueryBuilder<Extensions, Void> qb = queryBuilder();
  
  		setUniqueWhere(qb.where(), extensionName, false, null, false, null);
  
  		List<Extensions> extensions = qb.query();
  
  		return extensions;
  	}
docs: Query by extension name
  
  @param extensionName
  extension name
  @return extensions
  @throws SQLException
  upon failure