method Db.rollback

use std.orm { Db }

@table("items")
data Item { @pk id: i64; name: str }

fn main() io, db {
  let db = Db.open("sqlite::memory:")!
  db.insert(Item{ id: 1, name: "a" })
  db.begin()!
  db.insert(Item{ id: 2, name: "b" })
  db.rollback()!
  print("{db.count(Item)}")
}

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