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....
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...
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(...
# 打开lmdb环境 env = lmdb.open('/path/to/lmdb', max_dbs=10) # 开启事务 with env.begin() as txn: # 打开主数据库 db = txn.open_db() # 获取数据库统计信息 stat = txn.stat(db) # 遍历数据库列表 for i in range(stat['db_num']): # 获取数据库名称 db_name = txn.get_dbi(i)...
max_dbs=1024)withself.database.begin(write=False)astxn: cur = txn.cursor()fork, viniter(cur): logger.debug("Found existing store: %s", k) _db = self.database.open_db(k, create=False) self.stores[k] = Store(k, _db, self)exceptlmdb.Error: ...
env = lmdb.open(path, map_size=2**30, sync=False, max_dbs=1)returnLMDBStorage(env, clear)else:raiseException('Wroing storage type: %s'% storage_type) 开发者ID:hdidx,项目名称:hdidx,代码行数:26,代码来源:__init__.py 注:本文中的lmdb.open方法示例由纯净天空整理自Github/MSDocs等开源代码...
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 ...
这和事务对象有关。pip install imdb >>> env = lmdb.open('/tmp/test', max_dbs=2)>>> with env.begin(write=True) as txn ... txn.put('somename', 'somedata')>>> # Error: database cannot share name of existing key!>>> subdb = env.open_db('somename')
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...
>>>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。