Method with_auto_commit

crates/engine/src/relational_db.rs:927–935

Run a fallible function in a transaction. If the supplied function returns `Ok`, the transaction is automatically committed. Otherwise, the transaction is rolled back. This method is provided for convenience, as it allows to safely use the `?` operator in code running within a transaction context. Recall that a [`MutTx`] does not follow the RAII pattern, so the following code is wrong: ```ignor

(&self, workload: Workload, f: F)

    /// })?;
    /// ```
    pub fn with_auto_commit<F, A, E>(&self, workload: Workload, f: F) -> Result<A, E>
    where
        F: FnOnce(&mut MutTx) -> Result<A, E>,
        E: From<DBError>,
    {
        let mut tx = self.begin_mut_tx(IsolationLevel::Serializable, workload);
        let res = f(&mut tx);
        self.finish_tx(tx, res)
    }

    /// Run a fallible function in a transaction, rolling it back if the
    /// function returns `Err`.