c3p0_common 0.72.3

A good friend for r2d2
Documentation 
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use crate::error::C3p0Error;

use std::future::Future;

/// A trait for a C3p0 pool.
/// A C3p0 pool is a connection pool for a database.
pub trait C3p0Pool: Clone + Send + Sync {
    /// A type that represents a transaction.
    type Tx<'a>;

    /// Creates a new transaction.
    /// It executes the given closure `tx` within a transaction and returns the result of the closure.
    /// if the closure returns an error, the transaction is rolled back and the error is returned,
    /// otherwise the transaction is automatically committed.
    fn transaction<
        T: Send,
        E: Send + From<C3p0Error>,
        F: Send + AsyncFnOnce(&mut Self::Tx<'_>) -> Result<T, E>,
    >(
        &self,
        tx: F,
    ) -> impl Future<Output = Result<T, E>>;
}