Python對MongoDB增刪改查

pip install pymongo

import pymongo

#   創建鏈接
client = pymongo.MongoClient()

#   指定數據庫   （不存在則會新建）
db = client['py_mongo']
#   刪除數據庫
# client.drop_database('py_mongo_temp')


#   建立集合
# db.create_collection('col_temp')
#   刪除集合
# print(db.drop_collection('col_temp'))
#   指定集合     （不存在則會新建）
collection = db['mongo_col']

# collection = pymongo.MongoClient()['py_mongo']['mongo_col']

基本使用：insert() remove() update() find()

#   增   insert()
#   若是不指定_id參數，MongoDB會爲文檔分配一個惟一的ObjectId
#   增長一條
# collection.insert({'_id':1,'name':'JiYu','num':0})
#   增長多條
# collection.insert(  [
#     {'name':'jiyu','num':12},
#     {'name':'jiyu','num':34},
#     {'name':'nianhua','num':12},
#     {'name':'nianhua','num':34},
# ]   )


#   刪   remove()
#   刪除集合中知足條件的全部文檔
# collection.remove({'name':'jiyu'})
#   只刪除集合中知足條件的第一條文檔
# collection.remove({'name':'nianhua'},multi=False)
#   刪除全部
# collection.remove()


#   改   update()
#   修改一條數據  只有name，沒有num了，整條數據變成<update>裏的內容
# collection.update({'name':'jiyu'},{'name':'nianhua'})
#   指定屬性修改  $set
# collection.update({'name':'jiyu'},{'$set':{'name':'nianhua'}})
#   修改集合中全部知足條件的文檔：multi: true
# collection.update({'name':'nianhua'},{'$set':{'name':'NianHua'}},multi=True)


#   查   find()
#   查詢全部
# for i in collection.find():
#     print(i)
#   根據條件查詢
# for i in collection.find({'name': 'NianHua'}):
#     print(i)
#   and 和 or 條件
# condition = {'$or': [{'num': 12}, {'name': 'NianHua'}]}
# for i in collection.find(condition):
#     print(i)
#   操做符
# for i in collection.find({'num': {'$gt': 20}}):
#     print(i)

官方推薦：insert_one() delete_one() update_one() find_one()

#   增   insert_one()    insert_many()
#   添加一條
# collection.insert_one({'name':'ming','num':101})
#   添加多條
# collection.insert_many( [
#     {'name':'hong','num':111},
#     {'name':'fei','num':111}
# ] )


#   刪   delete_one()    delete_many()
#   刪除一條
# collection.delete_one({'num': 111})
#   刪除多條
# collection.delete_many({'name':'NianHua'})

#   改   update_one()    update_many()
#   須要用$進行操做，加上$set，不然會報錯：update only works with $ operators
#   修改一條
# collection.update_one({'name':'jiyu'},{'$set':{'num':99}})
#   修改多條
# collection.update_many({'name':'jiyu'},{'$set':{'num':99}})


#   查   find_one()      find()
#   查一條
# print(collection.find_one({'num':111}))
#   查找全部        find() 只是一個對象 用for 遍歷出來
for i in collection.find():
    print(i)