Struct ReadonlyTransaction

pub struct ReadonlyTransaction<'a> { /* private fields */ }

Implementations

impl<'a> ReadonlyTransaction<'a>

pub fn new_ro_child(&self) -> MdbResult<ReadonlyTransaction<'_>>

pub fn abort(&mut self)

Aborts transaction. But readonly transaction could be reused later by calling renew

pub fn reset(&mut self)

Resets read only transaction, handle is kept. Must be followed by call to renew

pub fn renew(&mut self) -> MdbResult<()>

Acquires a new reader lock after transaction abort or reset

pub fn bind(&self, db_handle: &DbHandle) -> Database<'_>

Examples found in repository

examples/simple.rs (line 31)

fn main() {
    let env = EnvBuilder::new().open("test-lmdb", 0o777).unwrap();

    let db_handle = env.get_default_db(DbFlags::empty()).unwrap();
    let txn = env.new_transaction().unwrap();
    {
        let db = txn.bind(&db_handle); // get a database bound to this transaction

        let pairs = vec![("Albert", "Einstein",),
                         ("Joe", "Smith",),
                         ("Jack", "Daniels")];

        for &(name, surname) in pairs.iter() {
            db.set(&surname, &name).unwrap();
        }
    }

    // Note: `commit` is choosen to be explicit as
    // in case of failure it is responsibility of
    // the client to handle the error
    match txn.commit() {
        Err(_) => panic!("failed to commit!"),
        Ok(_) => ()
    }

    let reader = env.get_reader().unwrap();
    let db = reader.bind(&db_handle);
    let name = db.get::<&str>(&"Smith").unwrap();
    println!("It's {} Smith", name);
}

Trait Implementations

impl<'a> Debug for ReadonlyTransaction<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.