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|
use sqlx::{sqlite::Sqlite, SqliteConnection, Transaction};
pub trait Provider {
fn sequence(&mut self) -> Sequences;
}
impl<'c> Provider for Transaction<'c, Sqlite> {
fn sequence(&mut self) -> Sequences {
Sequences(self)
}
}
#[derive(
Clone,
Copy,
Debug,
Eq,
Ord,
PartialEq,
PartialOrd,
serde::Deserialize,
serde::Serialize,
sqlx::Type,
)]
#[serde(transparent)]
#[sqlx(transparent)]
pub struct Sequence(i64);
pub struct Sequences<'t>(&'t mut SqliteConnection);
impl<'c> Sequences<'c> {
pub async fn next(&mut self) -> Result<Sequence, sqlx::Error> {
let next = sqlx::query_scalar!(
r#"
update event_sequence
set last_value = last_value + 1
returning last_value as "next_value: Sequence"
"#,
)
.fetch_one(&mut *self.0)
.await?;
Ok(next)
}
}
|
