ImportDefinitionUpdateType

The ImportDefinitionUpdateType object defines how the import definition handles new and existing data during the import process.

Name	Data Type	Description
AddAndDoNotUpdate	Enumeration	Ignores existing subscribers and only adds new subscribers. This property applies to both subscriber lists and data extensions. It corresponds to the Add Only option.
AddAndUpdate	Enumeration	Adds new subscribers and updates existing subscribers. his property applies to both subscriber lists and data extensions. It corresponds to the Add and Update option.
ColumnBased	Enumeration	Indicates that information in the import is updated based on columns.
Merge	Enumeration	Reserved for future use.
Overwrite	Enumeration	Indicates that imported information overwrites existing data. This property applies to data extensions, and it can be used only if no primary key is available.
UpdateButDoNotAdd	Enumeration	Indicates that any existing values are updated, but no new values can be entered. This property applies to both subscriber lists and data extensions. It corresponds to the Update Only option.