python操作mongodb

Posted 2020-12-01 BZ易风

安装pymongo库

pip install pymongo

操作

# coding=utf-8
from pymongo import MongoClient

# 实例化
client = MongoClient(host="127.0.0.1",port=27017)

collection = client["test1"]["t1"]  # 连接数据库 数据表
# 查询所有 返回Cursor集合
ret = collection.find()
# ret = list(ret)

# 插入一条数据 返回objectId
collection.insert({"name":"zhangsan","age":19})
# 插入多条数据 返回一个列表
item_list = [{"name":"item{}".format(i)} for i in range(1000)]
ret = collection.insert_many(item_list)
print(ret.inserted_ids)

# 修改一条数据
ret = collection.update_one({"name":"item5"},{"$set":{"name":"new-item5"}})
print(ret)
# 修改全部数据
ret = collection.update_many({"name":"item2"},{"$set":{"name":"new-item2"}})
print(ret)

# 删除一条数据
ret = collection.delete_one({"name":"item3"})
print(ret)
# 删除多条数据
ret = collection.delete_many({"name":"item3"})
print(ret)

# 查找一条数据
ret = collection.find_one({"name":"item2"})
# 查找多条数据
ret = collection.find({"name":"item3"})
for i in ret:
    print(i)

 使用列表推导式

# coding=utf-8
from pymongo import MongoClient

client = MongoClient()
coll = client["test1"]["t34"]

# 向t34插入1000条数据，_id为0,1,2  name为py0,py1,py2...
item_list = [{"_id":i,"name":"py{}".format(i)} for i in range(1000)]
print(item_list)
ret = coll.insert_many(item_list)

# 读取_id为整百的数据
ret = coll.find()  # 读取所有数据
ret = list(ret)  # 讲数据列表化
data = [i for i in ret if i["_id"]%100==0 and i["_id"]!=0]
print(data)