transaction about postgres-kit HOT 2 CLOSED

let pool = ...

let conn = try! pool.requestConnection().wait(); defer {
    pool.releaseConnection(conn)
}
        
do {
    _ = try conn.query("BEGIN;").wait()
    _ = try conn.query("UPDATE some_tbl_1 SET a = 1;").wait()
    _ = try conn.query("UPDATE some_tbl_2 SET b = 2;").wait()
    _ = try conn.query("COMMIT;").wait()
} catch let error {
    _ = try! conn.query("ROLLBACK;").wait()
    throw error
}