Introduction to the installation and basic operation of Mongodb in Node

1. Install mongodb

brew install mongodb

2. Database configuration

   1)vim ~/.bash_profile 
   2)立刻生效   source .bash_profile   # mongod db
   export PATH=/usr/local/Cellar/mongodb/3.4.9/bin:${PATH}

3. Open mongoldb

  1) sudo mongod  // 开启服务
  2) mongo        // 链接mongodb

4. Basic database operations

  1)  sho abs;  // 显示数据库
  2）use userinfo  //如果有则切换到userinfo数据库，如果没有就创建userinfo
  3)  db  //返回userinfo，表示当前userinfo处于准备状态
  4) db.users.insert({username:'admin',password:'123'})  //向userinfo中的users集合插入一条数据。如果有合集users则向该集合插入数据，如果没有，则先创建users集合，再插入数据
  5）db.users.find().pretty()  //显示users集合中的数据，pretty()是格式化
  6）db.users.remove({name:'xxx'})  //删除name为'xxx'的记录　7）db.users.remove({})  //删除users集合中的所有数据　8）db.users.drop()  //删除users集合　9）db.users.findOne({name:'xxx'})   //查询name为'xxx'的记录，只返回遇到的第一条记录　10）db.users.find()  //返回所有name为'xxx'的记录

5. Close the database:
Execute the following command on the command line

use admin;
db.shutdownServer();

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