为泛型类型编写Diesel CRUD操作

#[derive(Queryable, Insertable)]
#[table_name = "my_table"]
struct MyType {
    id: i32,
    name: String,
}

use diesel::prelude::*;
use diesel::pg::PgConnection;

fn establish_connection() -> PgConnection {
    let database_url = "postgres://username:password@localhost/my_database";
    PgConnection::establish(&database_url).expect("Failed to connect to database")
}

use diesel::prelude::*;

fn find_data<T>(conn: &PgConnection) -> Vec<T>
where
    T: Queryable<my_table::table, Pg>,
{
    my_table::table.load::<T>(conn).expect("Failed to load data")
}

use diesel::prelude::*;

fn insert_data<T>(conn: &PgConnection, data: &T)
where
    T: Insertable<my_table::table>,
{
    diesel::insert_into(my_table::table)
        .values(data)
        .execute(conn)
        .expect("Failed to insert data");
}

use diesel::prelude::*;

fn update_data<T>(conn: &PgConnection, id: i32, new_data: &T)
where
    T: AsChangeset<Target = my_table::table>,
{
    diesel::update(my_table::table.find(id))
        .set(new_data)
        .execute(conn)
        .expect("Failed to update data");
}

use diesel::prelude::*;

fn delete_data(conn: &PgConnection, id: i32) {
    diesel::delete(my_table::table.find(id))
        .execute(conn)
        .expect("Failed to delete data");
}