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A full-featured connection pool, designed for asynchronous connections (using
tokio). Originally based on r2d2.
Opening a new database connection every time one is needed is both inefficient
and can lead to resource exhaustion under high traffic conditions. A connection
pool maintains a set of open connections to a database, handing them out for
repeated use.
bb8 is agnostic to the connection type it is managing. Implementors of the
ManageConnection trait provide the database-specific logic to create and
check the health of connections.
A (possibly not exhaustive) list of adapters for different backends:
#[tokio::main]asyncfnmain(){let manager = bb8_foodb::FooConnectionManager::new("localhost:1234");let pool = bb8::Pool::builder().max_size(15).build(manager).await.unwrap();for _ in0..20{let pool = pool.clone();
tokio::spawn(asyncmove{let conn = pool.get().await.unwrap();// use the connection// it will be returned to the pool when it falls out of scope.});}}
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Full-featured async (tokio-based) postgres connection pool (like r2d2)