MongoDB CURD

//基本命令

//查看全部数据库
show dbs
//切换数据库,自动创建库
use test
//查看表内的集合
show collections
//查看文档
db.inventory.find();

// 插入数据 自动生成_id
db.student.insert({name:"rose",age:18,gender:"2",sex:"male"})
//指定_id 数字 String 均可，确保唯一性，不建议自定义.
db.student.insert({_id:2000,name:"rose",age:18,gender:"2"})
//插入复杂数据
db.student.insert({name:"小明",age:18,gender:"2",
    hobby:
    [
    "羽毛球",
    "篮球",
    "游泳"
    ],
    size:
    {
        heigh:180,
        weight:75,
        uom1:"cm",
        uom2:"kg"
    }
   })

//查看数据
db.student.find()

//批量插入数据 (传入数组)
db.student.insert([
{name:"mike",age:18,gender:"2"},
{name:"jack",age:19,gender:"2"},
{name:"张三",age:15,gender:"2"},
{name:"李四",age:17,gender:"2"}
]
)

//查找文档
db.student.find({_id:2000})
db.student.find({name:"jack"})
//返回限定条数
db.student.find(