# Functions
NewBoltDB creates a new boltDB.
NewInMemKVStore creates a new in memory kv store.
NewInMemStoreWithNamespace defines a wrapper to convert memStore to KVStoreWithNamespace.
NewKVStoreWithNamespaceWrapper create a kvstore with specified namespace and a KVStoreWithNamespace.
# Variables
ErrIO indicates the generic error of DB I/O operation.
ErrNotExist defines an error that the query has no return value in db.
NextHeightKey defines the constant key of next height.
# Structs
Config defines the config of db.
KVStoreWithNamespaceWrapper defines a wrapper to convert KVStoreWithNamespace to KVStore.
# Interfaces
KVStore defines the db interface using in committee.
KVStoreWithNamespace defines the db interface with namesapce.