Let's test our tool. Compile and run it with the following commands:

cargo run -- add user1 [email protected]
cargo run -- add user2 [email protected]
cargo run -- add userx [email protected]

If you add filtering and call the list subcommand, you will see the following output:

cargo run -- list
User { id: "a9ec3bae-c8c6-4580-97e1-db8f988f10f8", name: "user1", email: "[email protected]" }
User { id: "7f710d18-aea5-46f9-913c-b60d4e4529c9", name: "user2", email: "[email protected]" }

We got a perfect example of mapping pure Rust types to relational database types.