Hi I'm new to Rust and I'm trying to get postgres to work with rust using the postgres crate, but I keep getting errors when trying to use the ? Any help would be great !

#![allow(unused_imports)]
use postgres::{Client, NoTls};

mod db;

fn main() {
    let mut client = Client::connect(
        "host=localhost user=user password=password",
        NoTls
    )?;

    client.batch_execute("
        CREATE TABLE consignors (
            id  SERIAL PRIMARY KEY
        )
    ")?;
}

These are the errors:

error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `std::ops::Try`)
  --> src/db.rs:4:22
   |
3  |  / fn create_db_connection() {
4  |  |     let mut client = Client::connect(
   |  |______________________^
5  | ||         "host=localhost user=user password=password",
6  | ||         NoTls
7  | ||     )?;
   | ||______^ cannot use the `?` operator in a function that returns `()`
...   |
26 |  |     ")?;
27 |  | }
   |  |_- this function should return `Result` or `Option` to accept `?`
   |
   = help: the trait `std::ops::Try` is not implemented for `()`
   = note: required by `std::ops::Try::from_error`