一、模块安装
安装:
pip install pymongo
二、数据库连接
2.1 数据库连接,无密码
import pymongo mongo = pymongo.MongoClient("mongodb://127.0.0.1:27017/")
2.2 数据库连接,有密码
方式1:
import pymongo from urllib import parse username = parse.quote_plus('mofang') # 对用户名进行编码 password = parse.quote_plus('123456') # 对密码进行编码 database = "mofang" # 数据库名称 host = "127.0.0.1" port = "27017" mongo = pymongo.MongoClient('mongodb://%s:%s@%s:%s/%s' % ( username, password, host, port, database))
方式2:
import pymongo from urllib import parse username = parse.quote_plus('mofang') # 对用户名进行编码 password = parse.quote_plus('123456') # 对密码进行编码 database = "mofang" # 数据库名称 mongo = pymongo.MongoClient('mongodb://127.0.0.1:27017') # 组装成url进行连接 my_db = mongo["mofang"] my_db.authenticate(username,password)
方式3:
import pymongo from urllib import parse username = parse.quote_plus('root') # 对用户名进行编码 password = parse.quote_plus('123456') # 对密码进行编码 host = "127.0.0.1" port = "27017" database = "mofang" # 数据库名称 mongo = pymongo.MongoClient('mongodb://%s:%s@%s:%s/admin' % ( username, password, host, port)) my_db = mongo[database] my_collection = my_db["my_collection"] # 没有往集合里面保存文档之前,mongdb不会真正创建集合!
三、数据库管理
import pymongo # 数据库连接 mongo = pymongo.MongoClient("mongodb://127.0.0.1:27017/") # 创建数据库 my_db = mongo["my_db"] # 没有往集合里面保存文档之前,mongdb不会真正创建集合! # 查看数据库列表 print(mongo.list_database_names()) # 上面的 my_db 因为没有内容,所以没有被创建的。
四、集合管理
import pymongo mongo = pymongo.MongoClient("mongodb://127.0.0.1:27017/") my_db = mongo["my_db"] my_collection = my_db["my_collection"] # 没有往集合里面保存文档之前,mongdb不会真正创建集合! # 查看集合列表 print(my_db.list_collection_names()) # 删除集合 my_collection.drop() # 删除成功返回true,如果集合不存在,返回false
五、文档管理
5.1 添加文档
import pymongo mongo = pymongo.MongoClient("mongodb://127.0.0.1:27017/") my_db = mongo["my_db"] my_collection = my_db["my_collection"] # 添加一个文档 document = { "name": "xiaoming", "mobile": "13012345678","age":16} ret = my_collection.insert_one(document) print(ret.inserted_id) # 返回InsertOneResult对象 # 插入文档时,如果没有指定_id,将自动分配一个唯一的id。 # 添加多个文档 document_list = [ { "name": "xiaoming", "mobile": "13033345678","age":17}, { "name": "xiaohong", "mobile": "13044345678","age":18}, { "name": "xiaohei", "mobile": "13612345678","age":18}, ] ret = my_collection.insert_many(document_list) # 打印文档_id值列表: print(ret.inserted_ids)
5.2 删除文档
import pymongo mongo = pymongo.MongoClient("mongodb://127.0.0.1:27017/") my_db = mongo["my_db"] my_collection = my_db["my_collection"] # 删除一个文档 query = {"name":"xiaoming"} my_collection.delete_one(query) # 删除多个文档 query = { "mobile": {"$regex": "^130"} } ret = my_collection.delete_many(query) print("删除了%d个文档" % ret.deleted_count)
import pymongo from urllib.parse import quote_plus from bson import ObjectId if __name__ == "__main__": username = quote_plus("mofang") password = quote_plus("123456") # 获取数据库连接对象 mongo = pymongo.MongoClient(f"mongodb://{username}:{password}@127.0.0.1:27017/mofang") mofang = mongo["mofang"] user_list = mofang["user_list"] """删除文档""" query = {"_id": ObjectId("60d925e127bd4b7769251002")} ret = user_list.delete_one(query) print(ret) print(ret.deleted_count) """删除多个文档""" query = {"name": "xiaolan"} ret = user_list.delete_many(query) print(ret.deleted_count)
5.3 更新文档
import pymongo mongo = pymongo.MongoClient("mongodb://127.0.0.1:27017/") my_db = mongo["my_db"] my_collection = my_db["my_collection"] # 更新一个文档 query = { "name": "xiaoming" } data = { "$set": { "age": 18 } } my_collection.update_one(query, data) # 更新所有文档 query = { "mobile": {"$regex": "^130"} } data = { "$set": { "age": 18 } } my_collection.update_many(query, data)
5.4 查询文档
import pymongo mongo = pymongo.MongoClient("mongodb://127.0.0.1:27017/") my_db = mongo["my_db"] my_collection = my_db["my_collection"] # 查看一个文档 ret = my_collection.find_one() print(ret) # 查看所有文档 for document in my_collection.find(): print(document) # 查看文档部分字段,find和find_one的第二个参数表示控制字段的显示隐藏,1为显示,0为隐藏 for document in my_collection.find({},{ "_id": 0, "name": 1, "mobile": 1 }): print(document) # 条件查询 query = { "age": 18 } document_list = my_collection.find(query) for document in document_list: print(document) # 比较运算符 query = { "age": {"$gt":17} } document_list = my_collection.find(query) for document in document_list: print(document) # 排序显示 # 单个字段排序: # sort("键", 1) 升序 # sort("键",-1) 降序 # 多个字段排序: # sort([("键1",1),("键2",-1)]) document_list = my_collection.find().sort("age") for document in document_list: print(document) # 限制查询结果数量 document_list = my_collection.find().limit(3) print(document_list) # 偏移、跳过 # skip(int) document_list = my_collection.find().limit(3).skip(3) # 从第3篇文档开始获取3篇文档 print(document_list) # 自定义条件函数 document_list = my_collection.find({"$where":"this.age==18"}) print(document_list)