mongodump -h 127.0.0.1:27017 -d test -c test
mongorestore -h 127.0.0.1:27017 -d test -c test xxx.bson

#centos7 通过yum安装
[root@localhost ~]# vim /etc/yum.repos.d/mongodb.repo
[mongodb-org-4.4]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/4.4/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-4.4.asc
[root@localhost ~]# yum install -y mongodb-org
[root@localhost ~]# systemctl enable mongod
##修改监听的ip地址从127.0.0.1改为0.0.0.0
[root@localhost ~]# vim /etc/mongod.conf 
net:
  port: 27017
  bindIp: 0.0.0.0
[root@localhost ~]# systemctl start mongod

[root@localhost ~]# mongo
> show dbs;
admin   0.000GB
config  0.000GB
local   0.000GB
> use testdb
switched to db testdb
> db.users.insert({name:'hash',age:18,lenth:18,lover:'keke'})
WriteResult({ "nInserted" : 1 })
> show tables;
users
> show collections;
users
> show dbs;
admin   0.000GB
config  0.000GB
local   0.000GB
testdb  0.000GB

[root@localhost ~]# tar xf dump.tar.gz 
[root@localhost ~]# ls dump
mock
[root@localhost ~]# mongorestore dump
############查看测试数据
[root@localhost ~]# mongo
> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB
mock    0.047GB
testdb  0.000GB
> use mock
switched to db mock
> show collections
orders
> db.orders.findOne()
{
        "_id" : ObjectId("5dbe7a545368f69de2b4d36e"),
.................................省略部分输出
}

##insertedId 是mongodb提供的默认主键，字段名是_id
> db.fruit.insertOne({name:"apple"})
{
        "acknowledged" : true,
        "insertedId" : ObjectId("608a09b871cb09186460d9b8")
}
> db.fruit.insertMany([{name:"apple"},{name:"pear"},{name:"orange"}])
{
        "acknowledged" : true,
        "insertedIds" : [
                ObjectId("608a0ab571cb09186460d9b9"),
                ObjectId("608a0ab571cb09186460d9ba"),
                ObjectId("608a0ab571cb09186460d9bb")
        ]
}

> db.fruit.find()
{ "_id" : ObjectId("608a09b871cb09186460d9b8"), "name" : "apple" }
{ "_id" : ObjectId("608a0ab571cb09186460d9b9"), "name" : "apple" }
{ "_id" : ObjectId("608a0ab571cb09186460d9ba"), "name" : "pear" }
{ "_id" : ObjectId("608a0ab571cb09186460d9bb"), "name" : "orange" }

##find支持使用field.sub_field的形式查询子文档。假设有一个文档：
db.fruit.insertOne({
    name:"apple",
    from:{
        country:"China",
        province:"Guangdong"
    }
})
##查询子文档，要在双引号里面写文档的路径"from.country"， 第二种写法查询不到结果
> db.fruit.find({"from.country":"China"})
{ "_id" : ObjectId("608a117871cb09186460d9bc"), "name" : "apple", "from" : { "country" : "China", "province" : "Guangdong" } }
> db.fruit.find({"from":{country:"China"}})
> 

> db.fruit.insert([{"name":"Apple",color:["red","green"]},{"name":"Mango",color:["yellow","green"]}])
BulkWriteResult({
        "writeErrors" : [ ],
        "writeConcernErrors" : [ ],
        "nInserted" : 2,
        "nUpserted" : 0,
        "nMatched" : 0,
        "nModified" : 0,
        "nRemoved" : 0,
        "upserted" : [ ]
})
> db.fruit.find({color:"red"})
{ "_id" : ObjectId("608a12c271cb09186460d9bd"), "name" : "Apple", "color" : [ "red", "green" ] }
> db.fruit.find({$or:[{color:"red"},{color:"yellow"}]})
{ "_id" : ObjectId("608a12c271cb09186460d9bd"), "name" : "Apple", "color" : [ "red", "green" ] }
{ "_id" : ObjectId("608a12c271cb09186460d9be"), "name" : "Mango", "color" : [ "yellow", "green" ] }

###示例：
db.testcol.remove({a:1})//删除a等于1的记录
db.testcol.remove({a:{$lt:5}})//删除a小于5的记录
db.testcol.remove({})//删除所有记录
db.testcol.remove()//报错

db.colToDeDropped.drop()

[root@localhost ~]# pip3 install pymongo
WARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.
Collecting pymongo
  Downloading https://files.pythonhosted.org/packages/03/4b/2adf815a054b467e87de2b5c830dfc9bc75e9ae7f977b50e6bb8eca7c3ac/pymongo-3.11.3-cp36-cp36m-manylinux1_x86_64.whl (492kB)
    100% |████████████████████████████████| 501kB 455kB/s 
Installing collected packages: pymongo
Successfully installed pymongo-3.11.3
[root@localhost ~]# python3
Python 3.6.8 (default, Nov 16 2020, 16:55:22) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-44)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pymongo
>>> pymongo.version
'3.11.3'
>>> from pymongo import MongoClient
>>> uri="mongodb://192.168.52.129:27017"
>>> client= MongoClient(uri)
>>> print(client)
MongoClient(host=['192.168.52.129:27017'], document_class=dict, tz_aware=False, connect=True)

>>> db=client['eshop']
>>> user_coll=db['users']
##测试数据库还没有真正创建
>>> new_user={"username":"nina","password":"xxx","email":"11234@qq.com"}
>>> result=user_coll.insert_one(new_user)
>>> print(result)
<pymongo.results.InsertOneResult object at 0x2ba421f0fac8>

###python代码
>>> result = user_coll.update_one({"username":"nina"},{"$set":{"phone":"123456789"}})
>>> print(result)
<pymongo.results.UpdateResult object at 0x2ba421f29708>

###mongo下
> use eshop
switched to db eshop
> db.users.find()
{ "_id" : ObjectId("608a2e73cb2ff42ea94f7e57"), "username" : "nina", "password" : "xxx", "email" : "11234@qq.com", "phone" : "123456789" }