Trait mmtkvdb::EnvRef

pub trait EnvRef {
    unsafe fn open_or_create_dbs<'a, K, V, C>(
        &mut self,
        options: impl IntoIterator<IntoIter = impl Iterator<Item = &'a DbSpec<K, V, C>> + ExactSizeIterator>
    ) -> Result<Vec<Db<K, V, C>>>
    where
        K: Storable + ?Sized + 'a,
        V: Storable + ?Sized + 'a,
        C: Constraint;
    unsafe fn open_or_create_db<K, V, C>(
        &mut self,
        options: &DbSpec<K, V, C>
    ) -> Result<Db<K, V, C>>
    where
        K: Storable + ?Sized,
        V: Storable + ?Sized,
        C: Constraint;
}

Abstraction over &EnvRo and &mut EnvRw, which allows creating databases in the latter case if non-existing

This trait is only needed if you want to create generic code which works on either &EnvRo or &mut EnvRw and creates databases in the latter case if non-existing. In most cases, EnvRo or EnvRw can be used directly. (Note that you can call EnvRo’s methods on EnvRw automatically due to Deref coercion.)

Required Methods

unsafe fn open_or_create_dbs<'a, K, V, C>(
    &mut self,
    options: impl IntoIterator<IntoIter = impl Iterator<Item = &'a DbSpec<K, V, C>> + ExactSizeIterator>
) -> Result<Vec<Db<K, V, C>>>where
    K: Storable + ?Sized + 'a,
    V: Storable + ?Sized + 'a,
    C: Constraint,

Open databases in environment and, if possible, create if non-existing

Note that the implementation of EnvRef for &EnvRo does not create any database if non-existing.

SAFETY: If a database exists already, it must have been created with compatible options.

unsafe fn open_or_create_db<K, V, C>(
    &mut self,
    options: &DbSpec<K, V, C>
) -> Result<Db<K, V, C>>where
    K: Storable + ?Sized,
    V: Storable + ?Sized,
    C: Constraint,

Open database in environment and, if possible, create if non-existing

Note that the implementation of EnvRef for &EnvRo does not create any database if non-existing.

SAFETY: If a database exists already, it must have been created with compatible options.

Implementors

impl EnvRef for &EnvRo

impl EnvRef for &mut EnvRw