Exactly. That is why a query that successfully returns no items can be represented as Ok(None). A successful query with items returned would instead be Ok(Vec

Exactly. That is why a query that successfully returns no items can be represented as Ok(None). A successful query with items returned would instead be Ok(Vec<Item>). An error in the completing the query (for example, problem with the database), would be Err(DatabaseError) or Err(SomeOtherError).