code: public int deleteIds(String type) {
  		int deleted = 0;
  		try {
  			if (contentsIdDao.isTableExists()) {
  				List<ContentsId> contentsIds = getIds(type);
  				deleted = contentsIdDao.delete(contentsIds);
  			}
  		} catch (SQLException e) {
  			throw new GeoPackageException(
  					"Failed to delete contents ids by type. GeoPackage: "
  							+ geoPackage.getName() + ", Type: " + type, e);
  		}
  		return deleted;
  	}
docs: Delete contents ids for contents of the data type
  
  @param type
  contents data type
  @return deleted contents ids count