Toql Guide 0.4

There are two delete functions: delete_one, and delete_many.

Both functions take a predicate and delete all rows that match that predicate.

delete_one takes a key. It will build a filter predicate from that and delete the row that coresponds to the key.

delete_many builds a predicate from the filters of the Query argument. Field filters and predicates and considered, whereas field selects and selections in the query are ignored. See the query language for details.

  #[tokio::main(flavor="current_thread")]
  async fn main(){
use toql::prelude::{ToqlApi, Cache, Toql, query, Keyed};
use toql::mock_db::MockDb;

#[derive(Toql)]
#[toql(auto_key)]
struct User{
    #[toql(key)]
    id: u64,
    name: String,
}

let cache = Cache::new();
let mut toql = MockDb::from(&cache);

toql.delete_one(UserKey::from(5)).await.unwrap();
assert_eq!(toql.take_unsafe_sql(), "DELETE user FROM User user WHERE user.id = 5");

let u = User {id: 5, name: "John".to_string()};
toql.delete_one(u.key()).await.unwrap();
assert_eq!(toql.take_unsafe_sql(), "DELETE user FROM User user WHERE user.id = 5");

toql.delete_many(query!(User, "id eq 5")).await.unwrap();
assert_eq!(toql.take_unsafe_sql(), "DELETE user FROM User user WHERE user.id = 5");
}

delete does not do any cascading by itself. It just deletes rows from a single table. To cascade your deletes you must configure your database relations and tell the database what to do with your joined rows: Delete them too or just set the foreign key to NULL.

Check the manual for

• MySQL
• Postgres