db.createCollection(<name>, { capped: <boolean>,
                              autoIndexId: <boolean>,
                              size: <number>,
                              max: <number>,
                              storageEngine: <document>,
                              validator: <document>,
                              validationLevel: <string>,
                              validationAction: <string>,
                              indexOptionDefaults: <document>,
                              viewOn: <string>,
                              pipeline: <pipeline>,
                              collation: <document>,
                              writeConcern: <document>} )

Create Operations

     db.collection.insertOne()

     db.collection.insertMany()

db.collection.insertMany(
   [ <document 1> , <document 2>, ... ], ##这里是需要关系的，是一个document的集合
   {
      writeConcern: <document>,
      ordered: <boolean>
   })

Read Operations

• db.collection.find()

       db.test.find()

        { "_id" : ObjectId("5b48a1fe28317e2bbc2bf77b"), "name" : "hgs", "age" : 26 }

        { "_id" : ObjectId("5b48a26228317e2bbc2bf77c"), "name" : "hgs", "age" : 26 }

Update Operations

• db.collection.updateOne()  

• db.collection.updateMany()  

• db.collection.replaceOne()  

        > db.test.updateMany({age:24},{$set:{name:"testse"}})

        { "acknowledged" : true, "matchedCount" : 1, "modifiedCount" : 1 }

Delete Operations

• db.collection.deleteOne()  

• db.collection.deleteMany()  

    例如:

        > db.test.deleteOne({name:"testse"});

        { "acknowledged" : true, "deletedCount" : 1 }