November 2021
Intermediate to advanced
410 pages
12h 1m
Chinese
Content preview from MongoDB权威指南（第3版）
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事务
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171
client = MongoClient(uriString)
my_wc_majority = WriteConcern('majority', wtimeout=1000)
# 前提条件/步骤0：如果集合不存在，就创建集合
# 事务中的CRUD操作必须在已存在的集合中进行
client.get_database( "webshop",
write_concern=my_wc_majority).orders.insert_one(
{"sku": "abc123", "qty":0})
client.get_database( "webshop",
write_concern=my_wc_majority).inventory.insert_one(
{"sku": "abc123", "qty": 1000})
# 步骤1：定义回调方法以指定在事务内部执行的操作序列
def callback(my_session):
orders = my_session.client.webshop.orders
inventory = my_session.client.webshop.inventory
# 重要：必须将会话变量my_session传递给操作
orders.insert_one({"sku": "abc123", "qty": 100}, session=my_session)
inventory.update_one({"sku": ...
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