[SQLObject] SQLObject database integrity?

[Basil S. <ba...@ya...>]

Hi friends,

Suppose I have a reference table:

class Town(SQLObject):

	title = UnicodeCol()
	country = MultipleJoin('Country')

and a table that use above reference:

class Country(SQLObject):
	
	title = UnicodeCol()
	town = ForeignKey('Town')

And now the question, how I can prevent from deleting entry from 'town' 
table if it's used in a 'country' table?

Thanks!

-- 
Basil Shubin
Freelance Software Developer