Struct native_db::watch::query::WatchGet

pub struct WatchGet<'db, 'w> { /* private fields */ }

Watch only one value.

Implementations

impl WatchGet<'_, '_>

pub fn primary<T: Input>( &self, key: impl InnerKeyValue ) -> Result<(MpscReceiver<Event>, u64)>

Watch the primary key.

Returns a channel receiver and the watcher id. The watcher id can be used to unwatch the channel.

Example

use native_db::*;
use native_model::{native_model, Model};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
#[native_model(id=1, version=1)]
#[native_db]
struct Data {
    #[primary_key]
    id: u64,
}

fn main() -> Result<(), db_type::Error> {
    let mut builder = DatabaseBuilder::new();
    builder.define::<Data>()?;
    let db = builder.create_in_memory()?;
     
    // Watch the primary key
    let (_recv, _id) = db.watch().get().primary::<Data>(1u64)?;
    Ok(())
}

pub fn secondary<T: Input>( &self, key_def: impl KeyDefinition<DatabaseSecondaryKeyOptions>, key: impl InnerKeyValue ) -> Result<(MpscReceiver<Event>, u64)>

Watch the secondary key.

Returns a channel receiver and the watcher id. The watcher id can be used to unwatch the channel.

Example

use native_db::*;
use native_model::{native_model, Model};
use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
#[native_model(id=1, version=1)]
#[native_db]
struct Data {
    #[primary_key]
    id: u64,
    #[secondary_key]
   name: String,
}

fn main() -> Result<(), db_type::Error> {
    let mut builder = DatabaseBuilder::new();
    builder.define::<Data>()?;
    let db = builder.create_in_memory()?;
     
    // Watch the secondary key name
    let (_recv, _id) = db.watch().get().secondary::<Data>(DataKey::name, "test")?;
    Ok(())
}