mongodb find opearate

new a database

use test;

---

show database

show dbs;

---

show current database

db;

---

delete a database

db.dropDatabase()

---

create a collection

db.createCollection("movies");

---

show all collections

show collections;

---

delete collection

db.movies.drop();

---

insert data,the parameter must be a object!!!

db.movies.insert({name:'a',price:120});

---

you can insert many data in one query

db.movies.insert([{name:'b'},{name:'c'}]);

---

when '_id' key didn't in object,save() method is same as the insert() method

db.movies.save({name:'d'})

---

find all data

db.movies.find()

---

pretty data

db.movies.find().pretty();

---

find one data

db.movies.findOne();

---

find specify flied data (name equal to a )

db.movies.find({name:'a'});

---

price less than 100

db.movies.find({price:{$lt:100}})

---

price less and equal to 100

db.movies.find({price:{$lte:100}})

---

g than 100

db.movies.find({price:{$gt:100}})

---

not equal

db.movies.find({price:{$ne:100}})

---

and

db.movies..find({$and:[{name:'a'},{price:123}]})

---

or

db.movies.find({$or:[{name:'a'},{price:123}]})

---

db.movies.find({price:{$gt:100},$or:[{name:'a'},{falg:true}]})