Insert/Update

#[derive(Entity, Default)]
pub struct MyEntity {
#[primary_key]
id: i32,
name: String,
}
#[tokio::main]
async fn main() {
let mut entity = MyEntity::default();
entity.name = "Hello world"
let uri = "postgres://postgres:postgres@localhost/postgres";
let db = Db::connect(&uri, 50, None).await.unwrap();
// If it has value in the primary key it will update, otherwise it will save.
// The result tells which operation was performed.
let creating = entity.save(&db).await.unwrap();
}