Mongo cheatsheet（速查页）

Mongo cheatsheet：

 

JSON-style documents with dynamic schemas offer simplicity and power.

 

>show dbs;

>show collections

 

>db.createCollection("mycoll", {capped:true, size:100000}) // Size is in bytes

>db.blog.save({ title : "My First Post", author: {name : "Jane", id : 1}})

>a = {title:"edmond blog", author:{name:"edmond", id:2}});

>db.blog.save(a);

 

create index

>db.blog.ensureIndex({author.name:1});  "B-Tree" indexes.

 

>db.blog.findOne({"author.name" : "Jane"})

db.blog.remove({n:1}); // removes all where n == 1

 

 

> var mongo = db.blog.findOne({title :"edmond blog"});

> print(tojson(mongo));