RustでSQLからコードを生成するcornucopiaについて

cargo new --bin cornucopia-example

version: "3"
services:
  db:
    image: postgres:13.3
    environment:
      POSTGRES_USER: test
      POSTGRES_PASSWORD: password
    ports:
      - 5432:5432
    volumes:
      - postgres:/var/lib/postgresql
volumes:
  postgres:

schema "public" {}
table "users" {
  schema = schema.public
  column "id" {
    null = false
    type = int
    identity {
        generated = ALWAYS
        start = 10
        increment = 10
    }
  }
  primary_key  {
    columns = [column.id]
  }
  column "name" {
    null = false
    type = text
  }
}

atlas schema apply --url "postgresql://test:password@localhost:5432/test?sslmode=disable" --to "file://schema.hcl"

--! insert_user
INSERT INTO users(name)
VALUES (:name);

cargo install cornucopia

cornucopia live "postgresql://test:password@localhost:5432/test"
rustfmt --edition 2021 ./src/cornucopia.rs

// This file was generated with `cornucopia`. Do not modify.

#[allow(clippy::all, clippy::pedantic)]
#[allow(unused_variables)]
#[allow(unused_imports)]
#[allow(dead_code)]
pub mod types {}
#[allow(clippy::all, clippy::pedantic)]
#[allow(unused_variables)]
#[allow(unused_imports)]
#[allow(dead_code)]
pub mod queries {
    pub mod user {
        use cornucopia_async::GenericClient;
        use futures;
        use futures::{StreamExt, TryStreamExt};
        pub fn insert_user() -> InsertUserStmt {
            InsertUserStmt(cornucopia_async::private::Stmt::new(
                "INSERT INTO users(name)
VALUES ($1)",
            ))
        }
        pub struct InsertUserStmt(cornucopia_async::private::Stmt);
        impl InsertUserStmt {
            pub async fn bind<'a, C: GenericClient, T1: cornucopia_async::StringSql>(
                &'a mut self,
                client: &'a C,
                name: &'a T1,
            ) -> Result<u64, tokio_postgres::Error> {
                let stmt = self.0.prepare(client).await?;
                client.execute(stmt, &[name]).await
            }
        }
    }
}

cargo add tokio cornucopia_async futures tokio_postgres

use cornucopia::queries::user::insert_user;
use tokio_postgres::{Error, NoTls};

mod cornucopia;

#[tokio::main]
async fn main() -> Result<(), Error> {
    let (client, connection) = tokio_postgres::connect(
        "host=localhost port=5432 user=test password=password",
        NoTls,
    )
    .await?;

    tokio::spawn(async move {
        if let Err(e) = connection.await {
            eprintln!("connection error: {}", e);
        }
    });

    insert_user().bind(&client, &"me").await.unwrap();

    Ok(())
}