Package leveldb implements the key-value database layer based on LevelDB.



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    type Database

    type Database struct {
    	// contains filtered or unexported fields

      Database is a persistent key-value store. Apart from basic data storage functionality it also supports batch writes and iterating over the keyspace in binary-alphabetical order.

      func New

      func New(file string, cache int, handles int, namespace string) (*Database, error)

        New returns a wrapped LevelDB object. The namespace is the prefix that the metrics reporting should use for surfacing internal stats.

        func (*Database) Close

        func (db *Database) Close() error

          Close stops the metrics collection, flushes any pending data to disk and closes all io accesses to the underlying key-value store.

          func (*Database) Compact

          func (db *Database) Compact(start []byte, limit []byte) error

            Compact flattens the underlying data store for the given key range. In essence, deleted and overwritten versions are discarded, and the data is rearranged to reduce the cost of operations needed to access them.

            A nil start is treated as a key before all keys in the data store; a nil limit is treated as a key after all keys in the data store. If both is nil then it will compact entire data store.

            func (*Database) Delete

            func (db *Database) Delete(key []byte) error

              Delete removes the key from the key-value store.

              func (*Database) Get

              func (db *Database) Get(key []byte) ([]byte, error)

                Get retrieves the given key if it's present in the key-value store.

                func (*Database) Has

                func (db *Database) Has(key []byte) (bool, error)

                  Has retrieves if a key is present in the key-value store.

                  func (*Database) NewBatch

                  func (db *Database) NewBatch() ethdb.Batch

                    NewBatch creates a write-only key-value store that buffers changes to its host database until a final write is called.

                    func (*Database) NewIterator

                    func (db *Database) NewIterator(prefix []byte, start []byte) ethdb.Iterator

                      NewIterator creates a binary-alphabetical iterator over a subset of database content with a particular key prefix, starting at a particular initial key (or after, if it does not exist).

                      func (*Database) Path

                      func (db *Database) Path() string

                        Path returns the path to the database directory.

                        func (*Database) Put

                        func (db *Database) Put(key []byte, value []byte) error

                          Put inserts the given value into the key-value store.

                          func (*Database) Stat

                          func (db *Database) Stat(property string) (string, error)

                            Stat returns a particular internal stat of the database.

                            Source Files