Jdbc equivalent connection string option createDatabaseIfNotExist=true in nhibernate?

[Paper-Folding]

What is the equivalent connection string to that from jdbc below in nhibernate? (especially createDatabaseIfNotExist option)

jdbc:mysql://localhost:3306/mydb?createDatabaseIfNotExist=true&useUnicode=true&characterEncoding=UTF-8&serverTimezone=