MongoDb-CRUD

<pre name="code" class="sql">> post={"name":"tom","sex":"male","birthday":new Date()}
{
        "name" : "tom",
        "sex" : "male",
        "birthday" : ISODate("2016-10-11T09:30:26.429Z")
}
> db.blog.insert(post);
WriteResult({ "nInserted" : 1 })
> db.blog.find();
{ "_id" : ObjectId("57fcb069bc3f33db182aaefb"), "name" : "jason" }
{ "_id" : ObjectId("57fcb0cbbc3f33db182aaefc"), "name" : "sunhai", "a
{ "_id" : ObjectId("57fcb144bc3f33db182aaefd"), "name" : "tom", "sex"
"birthday" : ISODate("2016-10-11T09:30:26.429Z") }
> db.blog.find();
{ "_id" : ObjectId("57fcb069bc3f33db182aaefb"), "name" : "jason" }
{ "_id" : ObjectId("57fcb0cbbc3f33db182aaefc"), "name" : "sunhai", "a
{ "_id" : ObjectId("57fcb144bc3f33db182aaefd"), "name" : "tom", "sex"
> db.blog.findOne();
{ "_id" : ObjectId("57fcb069bc3f33db182aaefb"), "name" : "jason" }

> post.cardid=[]
[ ]
> db.blog.update({name:"jason"},post);
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.blog.find()
{ "_id" : ObjectId("57fcb069bc3f33db182aaefb"), "name" : "tom", "sex" : "male", "birthday" : ISODate("2016-10-11T09:30:26.429Z"), "c
{ "_id" : ObjectId("57fcb0cbbc3f33db182aaefc"), "name" : "sunhai", "age" : 27 }
{ "_id" : ObjectId("57fcb144bc3f33db182aaefd"), "name" : "tom", "sex" : "male", "birthday" : ISODate("2016-10-11T09:30:26.429Z") }

> post = {"name":"sunhai"}
{ "name" : "sunhai" }
> db.blog.remove(post)
WriteResult({ "nRemoved" : 1 })
> db.blog.find()
{ "_id" : ObjectId("57fcb069bc3f33db182aaefb"), "name" : "tom", "sex" : "male", "birthday" : ISODate("2016-10-11T09:30:26.429Z"), "cardid" : [ ] }
{ "_id" : ObjectId("57fcb144bc3f33db182aaefd"), "name" : "tom", "sex" : "male", "birthday" : ISODate("2016-10-11T09:30:26.429Z") }