Auto Generate Return Types When Specified

[mcmah309]

For returning statements, we could inject the type that should be returned automatically if it is included.

e.g.

-- name: add_new_book->ReturnType

Which will generate something like

fn add_new_book(&self, isbn: &str, book_title: &str) -> rusqlite::Result<ReturnType>;

ReturnType would need to implement a trait like FromRow. We could use the trait from this crate to automatically derive it: https://github.com/remkop22/rusqlite-from-row . Either copy the work or re-export.

So there is no need for a row_callback for when the return type is specified.