Mongoldb中完成将商品信息（至少包含商品名称、商品价格）和已结账的订单信息，保存到关系数据库中（建议选择 MySQL 或者 SQL Server），将未结账的订单信息，保存到MongoDB 中；具体代码怎么实现

以下是一个示例代码，展示了如何使用Python、MongoDBMySQL将商品信息和订单信息保存到对应的数据库中：

python
import pymongo
import mysql.connector

# MongoDB连接配置
mongodb_config = {
'host': 'mongodb://localhost:27017/',
'database': 'mydatabase',
'collection': 'unpaid_orders'
}

# MySQL连接配置
mysql_config = {
'host': 'localhost',
'user': 'your_username',
'password': 'your_password',
'database': 'mydatabase',
'table': 'paid_orders'
}

# 连接MongoDB
mongo_client = pymongo.MongoClient(mongodb_config['host'])
mongo_db = mongo_client[mongodb_config['database']]
mongo_collection = mongo_db[mongodb_config['collection']]

# 连接MySQL
mysql_connection = mysql.connector.connect(
host=mysql_config['host'],
user=mysql_config['user'],
password=mysql_config['password'],
database=mysql_config['database']
)
mysql_cursor = mysql_connection.cursor()

# 商品信息
product_name = "iPhone"
product_price = 999

# 已结账订单信息
paid_order_id = 1
paid_order_customer = "John Doe"
paid_order_total = 1999

# 未结账订单信息
unpaid_order_id = 2
unpaid_order_customer = "Jane Smith"
unpaid_order_total = 1499

# 保存商品信息到MySQL
mysql_cursor.execute("INSERT INTO {} (name, price) VALUES (%s, %s)".format(mysql_config['table']), (product_name, product_price))
mysql_connection.commit()

# 保存已结账订单信息到MySQL
mysql_cursor.execute("INSERT INTO {} (order_id, customer, total) VALUES (%s, %s, %s)".format(mysql_config['table']), (paid_order_id, paid_order_customer, paid_order_total))
mysql_connection.commit()

# 保存未结账订单信息到MongoDB
mongo_collection.insert_one({
'order_id': unpaid_order_id,
'customer': unpaid_order_customer,
'total': unpaid_order_total
})

# 关闭连接
mongo_client.close()
mysql_cursor.close()
mysql_connection.close()

请注意，此代码仅为示例，您需要根据自己的实际情况进行适当的修改。确保已安装了相应的Python驱动程序（如pymongo和mysql-connector-python），并且已正确配置MongoDB和MySQL的连接参数。