importlmdb# 创建或打开LMDB环境env=lmdb.open('path/to/your/database',max_dbs=1)# 开始一个写事务withenv.begin(write=True)astxn:# 执行写操作txn.put(b'key1',b'value1')# 开始一个读事务withenv.begin()astxn:value=txn.get(b'key1')print(value)# 输出:b'value1'# 开始一个删除事务withenv....
env = lmdb.open(path, map_size=2**30, sync=False, max_dbs=num_idx)return[LMDBStorage(env, clear, i)foriinxrange(num_idx)]# create normal storageelse: env = lmdb.open(path, map_size=2**30, sync=False, max_dbs=1)returnLMDBStorage(env, clear)else:raiseException('Wroing storage t...
vector = txn.get(the_hash.encode(encoding='UTF-8'))ifvector:# adapt expected shape/paddinglocal_embeddings = _deserialize_pickle(vector)iflocal_embeddings.shape[0] > max_size_sentence-2:# squeeze the extra padding spaceELMo_vector[i] = local_embeddings[:max_size_sentence-2,]eliflocal_embed...
map_size=MAX_SIZE, subdir=False, readonly=True, max_readers=MAX_READERS, max_dbs=4, lock=False, ) # Check if dataset is complete self.length = self._len_db() ifdatasetisnotNone: assertlen(dataset) == self.length,"Dataset Length Mismatch!" self.transform = transform def_cache_dataset...
>>>env=lmdb.open('/tmp/test',max_dbs=2)>>>withenv.begin(write=True)astxn...txn.put('somename','somedata')>>># Error: database cannot share name of existing key!>>>subdb=env.open_db('somename') lmdb.Transaction 这和事务对象有关。
MDB_dbi me_maxdbs; /**< size of the DB table */ MDB_PID_T me_pid; /**< process ID of this env */ char *me_path; /**< path to the DB files */ char *me_map; /**< the memory map of the data file */ MDB_meta *me_metas[NUM_METAS]; /**< pointers to the two met...
the database uses the default root database. However, you can use multiple databases per environment/file and instantiate a database for each one. If you are going to be opening many databases, make sure you set themaxDbs(it defaults to 12). For example, we can open multiple databases ...
varenv=newlmdb.Env();env.open({path:__dirname+"/mydata",mapSize:2*1024*1024*1024,// maximum database sizemaxDbs:3}); 当您不再需要环境时关闭它。 env.close(); Step 2: open one or more databases 环境(Env) 可以包含一个或多个数据库。 使用 env.openDbi() 打开数据库,它接受一个对象...
create() local jcodec = jsoncodec() driver.set_max_dbs(10) driver.set_codec(jcodec) driver.open("./lmdb/xxx.mdb", MDB_NOSUBDIR, 0644) driver.begin_txn("test", MDB_CREATE) local a = driver.put("abc1", {a=123}) local b = driver.put("abc2", "234") local c = driver.put(...
maxDbs- The maximum number of databases to be able to open (there is some extra overhead if this is set very high). maxReaders- The maximum number of concurrent read transactions (readers) to be able to open (more information).