code: public int deleteCascade(
  			Collection<DataColumnConstraints> constraintsCollection)
  			throws SQLException {
  		int count = 0;
  		if (constraintsCollection != null) {
  			for (DataColumnConstraints constraints : constraintsCollection) {
  				count += deleteCascade(constraints);
  			}
  		}
  		return count;
  	}
docs: Delete the collection of Data Column Constraints, cascading
  
  @param constraintsCollection
  constraints collection
  @return deleted count
  @throws SQLException
  upon failure