Error builder which captures any errors which are encountered

Get the exception object created for any errors that have happened so far.

Get the existing item in the database

Indicates if the argument is new (not in the database)

The changes given to the database. This object should be modified to make any additional changes

Gets an item which represents the new item after the changes are applied

Method for modifying the query to get existing items

Indicates if a property is being set null. Note that this does not detect if the property already is null.

Indicates if one or more properties in the list are changing

Gets a property from the Item item (if it exists). Otherwise, the property from Existing is returned