以编程方式取消MongoDB事务

from pymongo import MongoClient
from pymongo.errors import OperationFailure

# 连接MongoDB数据库
client = MongoClient('mongodb://localhost:27017')

# 获取数据库和集合对象
db = client['mydatabase']
collection = db['mycollection']

# 开启事务
with client.start_session() as session:
    # 开始事务
    with session.start_transaction():
        try:
            # 执行事务操作
            collection.insert_one({'name': 'John'})
            collection.delete_one({'name': 'Mike'})

            # 取消事务
            session.abort_transaction()
            print("事务已取消")
        except OperationFailure as e:
            # 处理事务执行失败的情况
            print("事务执行失败:", e)