MongoDB数据库__motor 

 

motor是异步实现python操作数据库的工具。能减少后端访问数据库的延迟。

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Motor 是一个异步实现的 MongoDB 存储库 Motor 与 Pymongo 的配置基本类似。连接对象就由 MongoClient 变为 AsyncIOMotorClient 了。

 

一、连接

# 普通连接
client = motor.motor_asyncio.AsyncIOMotorClient('mongodb://localhost:27017')
# 副本集连接
client = motor.motor_asyncio.AsyncIOMotorClient('mongodb://host1,host2/?replicaSet=my-replicaset-name')
# 密码连接
client = motor.motor_asyncio.AsyncIOMotorClient('mongodb://username:password@localhost:27017/dbname')
# 获取数据库
db = client.zfdb
# db = client['zfdb']
# 获取 collection
collection = db.test
# collection = db['test']

二、添加一条记录

async def do_insert():
document = {'name': 'zone','sex':'boy'}
result = await db.test_collection.insert_one(document)
print('result %s' % repr(result.inserted_id))
loop = asyncio.get_event_loop()
loop.run_until_complete(do_insert())

三、批量增加记录

async def do_insert():
result = await db.test_collection.insert_many(
[{'name': i, 'sex': str(i + 2)} for i in range(20)])
print('inserted %d docs' % (len(result.inserted_ids),))
loop = asyncio.get_event_loop()
loop.run_until_complete(do_insert())

四、查找一条记录

async def do_find_one():
document = await db.test_collection.find_one({'name': 'zone'})
pprint.pprint(document)
loop = asyncio.get_event_loop()
loop.run_until_complete(do_find_one())

五、查找多条记录

async def do_find():
cursor = db.test_collection.find({'name': {'$lt': 5}}).sort('i')
for document in await cursor.to_list(length=100):
pprint.pprint(document)
loop = asyncio.get_event_loop()
loop.run_until_complete(do_find())
# 添加筛选条件，排序、跳过、限制返回结果数
async def do_find():
cursor = db.test_collection.find({'name': {'$lt': 4}})
# Modify the query before iterating
cursor.sort('name', -1).skip(1).limit(2)
async for document in cursor:
pprint.pprint(document)
loop = asyncio.get_event_loop()
loop.run_until_complete(do_find())

六、统计

async def do_count():
n = await db.test_collection.count_documents({})
print('%s documents in collection' % n)
n = await db.test_collection.count_documents({'name': {'$gt': 1000}})
print('%s documents where i > 1000' % n)
loop = asyncio.get_event_loop()
loop.run_until_complete(do_count())

七、替换

async def do_replace():
coll = db.test_collection
old_document = await coll.find_one({'name': 'zone'})
print('found document: %s' % pprint.pformat(old_document))
_id = old_document['_id']
result = await coll.replace_one({'_id': _id}, {'sex': 'hanson boy'})
print('replaced %s document' % result.modified_count)
new_document = await coll.find_one({'_id': _id})
print('document is now %s' % pprint.pformat(new_document))
loop = asyncio.get_event_loop()
loop.run_until_complete(do_replace())

八、更新指定字段，不会影响到其他内容

async def do_update():
coll = db.test_collection
result = await coll.update_one({'name': 0}, {'$set': {'sex': 'girl'}})
print('更新条数： %s ' % result.modified_count)
new_document = await coll.find_one({'name': 0})
print('更新结果为： %s' % pprint.pformat(new_document))
loop = asyncio.get_event_loop()
loop.run_until_complete(do_update())

九、删除置顶记录

async def do_delete_many():
coll = db.test_collection
n = await coll.count_documents({})
print('删除前有 %s 条数据' % n)
result = await db.test_collection.delete_many({'name': {'$gte': 10}})
print('删除后 %s ' % (await coll.count_documents({})))
loop = asyncio.get_event_loop()
loop.run_until_complete(do_delete_many())