minimal working example with diesel

src/lib.rs

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+use diesel::prelude::*;
+use dotenvy::dotenv;
+use std::{env};
+use std::io::{stdout, Write};
+
+pub mod models;
+pub mod schema;
+
+pub fn establish_connection() -> PgConnection {
+    dotenv().ok();
+
+    // let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+    // let database_name = env::var("DATABASE_NAME").expect("DATABASE_NAME must be set");
+    // let database_user = env::var("DATABASE_USER").expect("DATABASE_USER must be set");
+    // let database_password = env::var("DATABASE_PASSWORD").expect("DATABASE_PASSWORD must be set");
+
+    // let connection_url= format!("postgres://{}:{}@{}/{}", database_user, database_password, database_url, database_name);
+    
+    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+
+    println!("{}", database_url);
+
+    PgConnection::establish(&database_url)
+        .unwrap_or_else(|_| panic!("Error connecting to {}", database_url))
+}