mongoose delete

data, there are three ways to delete data: remove();findOneAndRemove();findByIdAndRemove(); The remove method can be used in either model or model instance. For example: User. remove ({name:/Simon/}, function (err) {if (! Err) {// delete all users whose names contain simon}); User. findOne ({email: 'simon @ theholmesoffice.com '}, function (err, user) {if (! Err) {user. remove (function (err) {//

Mongoose simple table connection query and Mongoose simple The original article is taken from my front-end blog. You are welcome to visit Http://www.hacke2.cn As I mentioned in this article, it is based on Node. js + jade + Mongoose mimic gokk. TV, at that time, the development was stopped because I deeply felt that I was wrong at that time. I should use two sche

');/** Get model, create instance of book Entity **/varBook = Mongoose.model (' book ');varBook =NewBook ({name:' MEAN Web Develop ', Author:' Green ', Publishtime:NewDate ()}); Book.author= ' Jim ';//parameters can be re-specified/** Insert Data **/Book.save (function(ERR) {//perform the Save and view the return statusConsole.log (' Save status: ', err? ' Failed ': ' Success ');})Simple queryFind.jsvar mongoose = require ('

Mongoose getting started with mongooseNo matter what database you use as the db service, connect is an essential step. Method 1: @ Param {String} uri @ param {Object} options @ param {Function} callbackconnect (uri, [options], [callbakc]) returns the mongoose Object. connect ('mongodb: // localhost/test', {mongos: true}, function (err, result) {if (err) {console. log ('error ing to MongoDB Database. '+ err)

; var newtask = new Taskmodel (Task); Newtask.save (function (err, taskItem) { if (err) { return callback (ERR); } Callback (null, TaskItem); });　　It is important to note that the database document storage method is modified on the task prototype chain and is implemented using the Save () function. During the operation of the data store, first generate an instance from the prototype object, w

Ns_write_to_socket function!\n", Conn->flags, (conn->sock!= null?conn->sock:-1));//just for debugging Ns_write_to_socket (conn);} }}} Loop=0; for (conn = mgr->active_connections; conn! = NULL; conn = tmp_conn) {printf ("The For Loop %d times\n ", loop++); tmp_conn = Conn->next;if (Conn->flags nsf_close_immediately) | | (Conn->send_iobuf.len = = 0 (conn->flags Nsf_finished_sending_data))) {printf ("for the Flag--%d--2--, for the sock--%d--call Ns_close_conn function!\n", Conn->flags, (conn

Detailed description of node. js's addition, deletion, modification, and query operations based on the mongoose module, nodejsmongoose MongoDB MongoDB is a Javascript-based database with a JSON storage format, while Node is also a JavaScript-based environment (library ), therefore, the combination of node and mongoDB can reduce the time space overhead caused by data conversion. Mongoose It is an object mode

when calling its Delete method, because you will delete it from the database, not just the array.Populate existing documentIf we have an existing mongoose document and want to populate it with some path,mongoose >= 3.6 supports the Document#populate () method.Populating multiple existing documentIf we have one or more

A burst of Byron teacher spoke about MongoDB's crud operations, including:How to create a new database (use dbname), delete a database (use dbname →db.dropdatabase ()), add data (db. CollectionName. Insert ({}) to view the data in the table (db. CollectionName. Find), sorted (sort), the data is too many to take the first few (. limit), skip the first few (. skip), limit and skip together in the time of the page is the most favorite, such as a page i

mongoose. model. After obtaining the Model object, you can perform operations such as adding, deleting, modifying, and querying. Model objects include methods such as find (), findOne (), update (), and remove (), which are similar to the usage in mongo shell. Each of these methods has an optional callback. When you provide these callback, the execution result will be returned to you through this callback. If you do not provide it, these methods will

Mongoose is an node.js mongodb object Model tool for convenient operation in the environment. Therefore, to use mongoose , you must install the node.js environment and the mongodb database. Mongoose makes MongoDB operations easier and easier. Can get its source code in GitHub, but also here to view the API documentation, English, the document content is more

when defining a schema is consistent with the first parameter of the Mongoose.model. Get the Model object, you can perform additions and deletions to check and other operations. The model object has methods such as find (), FindOne (), update (), remove (), and so on, similar to our usage in the MONGO shell. These methods have an optional callback, and when you provide these callback, the results of the execution will be returned to you through this callback. If you do not, these methods retur

: ' Female ' } }); //Select CollectionLet Monmodel = Db.model (' user ', Monschema); //Data SetLet content = {name: ' Nick ', age:23, Gender: ' Male '}; //instantiating an object and inserting dataLet Moninsert =NewMonmodel (content); Moninsert.save (err)= { if(Err) {Console.log (err); } Else{Console.log (' successfully inserting data '); } //Close the database db.close ();}); Delete and change the complete code: //Introducing ModulesCons

Database var db = mongoose.createconnection (' mongodb://127.0.0.1:27017/test '); Set data type var Monschema = new Mongooose. Schema ({ name:{type:string,default: "username"}, Age:{type:number}, sex:{type:string} ); Select Set var Monmodel = Db.model (' user ', Monschema); DataSet var content = {Name: "Nick", Age:23,sex: ' Male '}; Instantiate the object and insert the data var moninsert = new Monmodel (content); Moninsert.save (function (err) { if (err) { console.log (err); } else{ con

Mongoose Library in short, a convenient package for manipulating MongoDB databases in the node environment, an object model tool similar to Orm,mongoose converts data from a database into JavaScript objects for you to use in your app.Of course, you have to install the Environment node. js and MongoDB = "MongoDB installationMongoDB is one of the most popular NoSQL databases, developed specifically for node.

query based on static methodsMongoosemodel.findbytitle (' Emtity_demo_title ', function (error, result) {if (Error) {Console.log (Error);} else {Console.log (result);}Close Database LinkDb.close ();});Mongoose Findvar criteria = {title: ' Emtity_demo_title '}; Query criteriavar fields = {title:1, content:1, time:1}; Fields to returnvar options = {};Mongoosemodel.find (Criteria, fields, options, function (error, result) {if (Error) {Console.log (Error

Mongoose: how to solve the problem that unique does not take effect and how to remove the unique restriction, mongooseunique Preface Unique is a member of schema Constraints Verification. Its role is to make the value of a field unique (cannot be repeated) To keep the field unique, use the type value:{type:String,unique:true,dropDups: true} Note:Once mongoose modifies the data storage organization, the data

Mongoose Reference Manualtags (space delimited): MongoDB In general, we do not directly use MongoDB functions to manipulate MongoDB database Mongose is a set of Operations MongoDB database interface.SchemaA database model skeleton, stored as a file, does not have direct access to the database, which means that it does not have the ability to manipulate the database. Can be said to be a data attribute model (the traditional meaning of the table s

like this:var blog = new Blog({ is my blog title‘, author: ‘me‘, body: ‘the body of my blog. can you see that?‘ });Database operationsAfter defining the model, we can make a record of the additions and deletions to check the changes. Mongoose to add and delete is very simple, with our previous section of the blog model for example, when we initialized a blog post record, and did not save it into t

• Delete Database Db.dropdatabase ()• Disconnect MongoDB from MongoDB service exitAction Collection Method Db.worker.help () View Help API• See which collections are in the current database show collections• Create collection Db.createcollection ("collection_name")• Inserting a document into the collection Db.collection_name.insert Note: Document refers to the documents to be inserted• See how many document data are in the collection Db.collection_nam