MongoDB

1.关系型与非关系型数据库

2.安装数据库

https://docs.mongodb.com/manual/administration/install-community/

3.启动数据库

（1）windows

mongod --dbpath d:/data/db
mongo

（2）mac

mongod --config /usr/local/etc/mongod.conf
mongo

4.在命令行中操作数据库

5.可视化工具进行增删改查

Robomongo Robo3T adminMongo

6.nodejs连接操作数据库

连接数据库

const mongoose = require("mongoose")

mongoose.connect("mongodb://127.0.0.1:27017/company-system")

创建模型

const mongoose = require("mongoose")

const Schema = mongoose.Schema

const UserType = {
    username:String,
    password:String,
    gender:Number,
    introduction:String,
    avatar:String,
    role:Number
}
const UserModel = mongoose.model("user",new Schema(UserType))
module.exports  = UserModel 

增加数据

UserModel.create({
    introduction,username,gender,avatar,password,role
})

查询数据

UserModel.find({username:"kerwin"},["username","role","introduction","password"]).sort({createTime:-1}).skip(10).limit(10)

更新数据

UserModel.updateOne({
    _id
},{
    introduction,username,gender,avatar
})

删除数据

UserModel.deleteOne({_id})