pub struct DatabaseEnv { /* private fields */ }
provider
and mdbx
only.Expand description
Wrapper for the libmdbx environment: Environment
Implementations§
Source§impl DatabaseEnv
impl DatabaseEnv
Sourcepub fn open(
path: &Path,
kind: DatabaseEnvKind,
args: DatabaseArguments,
) -> Result<DatabaseEnv, DatabaseError>
pub fn open( path: &Path, kind: DatabaseEnvKind, args: DatabaseArguments, ) -> Result<DatabaseEnv, DatabaseError>
Opens the database at the specified path with the given EnvKind
.
It does not create the tables, for that call DatabaseEnv::create_tables
.
Sourcepub fn with_metrics(self) -> DatabaseEnv
pub fn with_metrics(self) -> DatabaseEnv
Enables metrics on the database.
Sourcepub fn create_tables(&self) -> Result<(), DatabaseError>
pub fn create_tables(&self) -> Result<(), DatabaseError>
Creates all the tables defined in Tables
, if necessary.
Sourcepub fn create_tables_for<TS>(&self) -> Result<(), DatabaseError>where
TS: TableSet,
pub fn create_tables_for<TS>(&self) -> Result<(), DatabaseError>where
TS: TableSet,
Creates all the tables defined in the given TableSet
, if necessary.
Sourcepub fn record_client_version(
&self,
version: ClientVersion,
) -> Result<(), DatabaseError>
pub fn record_client_version( &self, version: ClientVersion, ) -> Result<(), DatabaseError>
Records version that accesses the database with write privileges.
Methods from Deref<Target = Environment>§
pub fn is_write_map(&self) -> bool
pub fn is_write_map(&self) -> bool
Returns true if the environment was opened as WRITEMAP.
pub fn env_kind(&self) -> EnvironmentKind
pub fn env_kind(&self) -> EnvironmentKind
Returns the kind of the environment.
pub fn is_read_write(&self) -> Result<bool, Error>
pub fn is_read_write(&self) -> Result<bool, Error>
Returns true if the environment was opened in crate::Mode::ReadWrite
mode.
pub fn is_read_only(&self) -> Result<bool, Error>
pub fn is_read_only(&self) -> Result<bool, Error>
Returns true if the environment was opened in crate::Mode::ReadOnly
mode.
pub fn timed_out_not_aborted_transactions(&self) -> usize
Available on crate feature read-tx-timeouts
only.
pub fn timed_out_not_aborted_transactions(&self) -> usize
read-tx-timeouts
only.Returns the number of timed out transactions that were not aborted by the user yet.
pub fn begin_ro_txn(&self) -> Result<Transaction<RO>, Error>
pub fn begin_ro_txn(&self) -> Result<Transaction<RO>, Error>
Create a read-only transaction for use with the environment.
pub fn begin_rw_txn(&self) -> Result<Transaction<RW>, Error>
pub fn begin_rw_txn(&self) -> Result<Transaction<RW>, Error>
Create a read-write transaction for use with the environment. This method will block while there are any other read-write transactions open on the environment.
pub fn freelist(&self) -> Result<usize, Error>
pub fn freelist(&self) -> Result<usize, Error>
Retrieves the total number of pages on the freelist.
Along with Environment::info()
, this can be used to calculate the exact number
of used pages as well as free pages in this environment.
let dir = tempfile::tempdir().unwrap();
let env = Environment::builder().open(dir.path()).unwrap();
let info = env.info().unwrap();
let stat = env.stat().unwrap();
let freelist = env.freelist().unwrap();
let last_pgno = info.last_pgno() + 1; // pgno is 0 based.
let total_pgs = info.map_size() / stat.page_size() as usize;
let pgs_in_use = last_pgno - freelist;
let pgs_free = total_pgs - pgs_in_use;
Note:
-
MDBX stores all the freelists in the designated database 0 in each environment, and the freelist count is stored at the beginning of the value as
uint32_t
in the native byte order. -
It will create a read transaction to traverse the freelist database.
Trait Implementations§
Source§impl Database for DatabaseEnv
impl Database for DatabaseEnv
Source§fn tx(&self) -> Result<<DatabaseEnv as Database>::TX, DatabaseError>
fn tx(&self) -> Result<<DatabaseEnv as Database>::TX, DatabaseError>
Source§fn tx_mut(&self) -> Result<<DatabaseEnv as Database>::TXMut, DatabaseError>
fn tx_mut(&self) -> Result<<DatabaseEnv as Database>::TXMut, DatabaseError>
§fn view<T, F>(&self, f: F) -> Result<T, DatabaseError>
fn view<T, F>(&self, f: F) -> Result<T, DatabaseError>
Source§impl DatabaseMetrics for DatabaseEnv
impl DatabaseMetrics for DatabaseEnv
Source§fn report_metrics(&self)
fn report_metrics(&self)
Source§fn gauge_metrics(&self) -> Vec<(&'static str, f64, Vec<Label>)>
fn gauge_metrics(&self) -> Vec<(&'static str, f64, Vec<Label>)>
Source§impl Debug for DatabaseEnv
impl Debug for DatabaseEnv
Source§impl Deref for DatabaseEnv
impl Deref for DatabaseEnv
Source§type Target = Environment
type Target = Environment
Auto Trait Implementations§
impl Freeze for DatabaseEnv
impl !RefUnwindSafe for DatabaseEnv
impl Send for DatabaseEnv
impl Sync for DatabaseEnv
impl Unpin for DatabaseEnv
impl !UnwindSafe for DatabaseEnv
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§impl<TxEnv, T> FromRecoveredTx<&T> for TxEnvwhere
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Size: 24 bytes