Basically, just to break it down:
You need to provide 3 procs for mapping as defined on that webpage:
- dbType(T: typedesc[YourType]) -> string maps your Nim type to a database type
(e.g. func dbType(T: typedesc[string]): string = "TEXT" for SQLite)
- dbValue(YourType) -> DbValue converts an instance of YourType to a DbValue
instance.
- to(DbValue, T: typedesc[YourType]) -> T converts a DbValue instance to an
instance of YourType.