RustでHeroku Postgresに接続する方法 - Qiitatokio = { version = "1.17.0", features = ["full"] } tokio-postgres = "0.7.5" openssl = "0.10.38" postgres-openssl = "0.5.0" use dotenv::dotenv; use std::env; async fn connect_to_database() -> Result<tokio_postgres::Client, Box<dyn std::error::Error>> { dotenv().ok(); let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set"); let (client, connection) = tokio_postgres::connect(&
