Struct Migrate 

pub struct Migrate { /* private fields */ }

migrate helper

Implementations

impl Migrate

pub fn new<P: Into<PathBuf>>(path: P, hardforks: HardForks) -> Self

Construct new migrate

pub fn open_read_only_db(&self) -> Result<Option<ReadOnlyDB>, Error>

Open read only db

pub fn check(&self, db: &ReadOnlyDB, include_background: bool) -> Ordering

Check if database’s version is matched with the executable binary version.

Returns

• Less: The database version is less than the matched version of the executable binary. Requires migration.
• Equal: The database version is matched with the executable binary version.
• Greater: The database version is greater than the matched version of the executable binary. Requires upgrade the executable binary.

pub fn require_expensive( &self, db: &ReadOnlyDB, include_background: bool, ) -> bool

Check whether database requires expensive migrations.

pub fn can_run_in_background(&self, db: &ReadOnlyDB) -> bool

Check whether the pending migrations are all background migrations.

pub fn open_bulk_load_db(&self) -> Result<Option<RocksDB>, Error>

Open bulk load db.

pub fn migrate( self, db: RocksDB, run_in_background: bool, ) -> Result<RocksDB, Error>

Perform migrate.

pub fn init_db_version(self, db: &RocksDB) -> Result<(), Error>

Perform init_db_version.