SQL CLR Types
The last SQL CLR feature for us to explore is user-defined types (UDTs). This feature is perhaps the most interesting, yet also the most controversial. It’s interesting because, technically, it allows for storage of objects in the database. It’s controversial because it’s prone to abuse. SQL CLR types were not implemented to allow developers to create object-oriented databases; they were created to allow multivalue or multibehavior data types to be stored, retrieved, and easily manipulated.
SQL CLR types have certain indexing limitations, and their entire value must be updated when any of their individual property/field values is updated.
More information about SQL CLR UDTs is available in the MSDN article "Using CLR Integration ...