使用行的自定义字段向Pymongodb插入记录时避免重复

from pymongo import MongoClient

# 连接到MongoDB数据库
client = MongoClient('mongodb://localhost:27017/')
db = client['mydatabase']

# 定义自定义字段
unique_field = "custom_field"

# 查询是否存在该字段的记录
existing_record = db.collection.find_one({unique_field: "some_value"})

# 如果查询结果为空，进行插入操作
if existing_record is None:
    new_record = {"field1": "value1", "field2": "value2", unique_field: "some_value"}
    db.collection.insert_one(new_record)
    print("插入成功！")
else:
    print("记录已存在，跳过插入操作。")

# 关闭数据库连接
client.close()