mongoose types

is used to generate the instance (document-level).4.1 schema is used to define the rules for generating the contents of a database document as well as examples of methods, such as the following code definition schema, then generated in the MongoDB database will see the output format as{"_id": ObjectId ("55b1cb286697a8bc17cce7b8"), "name": "Fluffy", "__v": 0},where the ID is added by default, and is added randomly, __v is a version lock (for the moment do not know what to do) , is also added by

operate the database. schemaCan be understood as a definition of the mongoose table structure (not only can define the structure and properties of the document, but also can define the document's instance method, static model method, composite index, etc.), each schema map to a collection in MongoDB, schema do not have the ability to manipulate the databaseDefine SchemaGrammarNew Mongoose. Schema ({Fi

', animalschema); The actual instance of the model is a file, and we can easily create and modify this file var cat = new Animalmode ({ name: ' CatName ', age : ' 7 ',//still use string here, Mongoose will automatically convert type }); Cat.save (function (err, Thor) { if (err) return Console.log (err); Console.log (Thor); }); Alternatively, you can use the Create //cat.create (function (err, Thor) { //if (ERR) return C

related purpose Document: A document is a set of key-value pairs. File dynamic mode. Dynamic mode refers to documents in the same collection that do not require a collection of common fields that have the same field or structure group, and can accommodate different types of data. The table given below shows RDBMS terminology using MongoDB relationships　　The most important thing to observe is that the tables and fields in our relational datab

person collection is created, and then the data is saved. With the model, there is the ability to manipulate the data. To create a model, you need to specify two points: 1, the collection name, 2, the schema structure object of the collection. Meet these two points, you can operate the database.Entity BriefEntities created by model use the Save method to save data, both model and entity have operations that affect the database, but the model is more operational than entity. Once the entity is c

model in mongoose in addition to Schma. It is possible to understand this temporarily: we first define the schema and then generate the model from the schema, at which point the model has a way of interacting with the database.Let's start by defining a blog post schema, as follows.var blogSchema = new Schema({ title: String, author: String, body: String, comments: [{ body: String, date: Date }], date: { type: Date, default: Date.now }, hidden:

set the value of a field, the following code is equivalent to the preceding: coll.update({name:"ZhangSan"},{$set: {password:"567890"}}); Managing Databases with Mongoosenode. JS has a database driver for MongoDB: MongoDB. You can install it using NPM install MongoDB. However, although the direct use of the MongoDB module is powerful and flexible, but some cumbersome, I will use Mongoose bar. If you are interested in the original driver module, you ca

(Err) {callback (Err,NULL); } Callback (NULL, Doc); })}//DeleteExports.delete=function (id,callback) {Exports.findtodobyid (Id,function (err,doc) {if(Err) {callback (ERR); }Else{doc.remove (); Callback (NULL); } })}//Edit Titleexports.edittitle=function (id,title,callback) {Exports.findtodobyid (Id,function (err,doc) {if(Err) {callback (ERR); }Else{doc.post_date=NewDate (); Doc.title=title; Doc.save (function (err) {if(Err) {callback (ERR); }Else{Callback (NULL); }})}exports.alltodos=function (

QuestionI have the just started mongodb up with and I recently gone through Mongoose , the an ODM framework.On the documentation, I couldn ' t find why do we need to use Mongoose . One reason I can give is the we can define application schema from Mongoose .I am looking for more possible reasons, and needs that would attract me to use

()Introduction to using the Mongoose module to manipulate MongoDB modulesMongoose is a module that corresponds to a Nodejs object and a document in MongoDB.The mongoose supports both strong mode and modeless mode.Install Mongoose:$ NPM Install MongooseLet's look at the final directory structure:Configuration and LinksThe format of the link: (You can also omit th

Schema Briefschema--is a kind of database model skeleton stored in file form, which can not directly go to the database side, that is, it does not have the ability to operate the database, just a representation of the database model in the program fragment, it is a data attribute model (the traditional meaning table structure), or a "set" model skeleton.So how to define a schema, see example:var mongoose = require ("

background:The Dicom column introduces the installation and use of the deconstructed PACs (distributed PACs) Orthanc, as well as the analysis of the main modules such as plug-ins and SQLite databases, and introduces the Web Server,mongoose embedded in Orthanc. Relying on Mongoose, this lightweight web Server,orthanc is a good implementation of the RESTful API and traditional DICOM service integration, which

Document: A document is a set of key-value pairs. File dynamic mode. Dynamic mode refers to documents in the same collection that do not require a collection of common fields that have the same field or structure group, and can accommodate different types of data. The table given below shows RDBMS terminology using MongoDB relationships The most important thing to observe is that the tables and fields in our relational database are replace