Mongoose Database Operations 3

Model.find(query, fields, options, callback)

Model.find({ ‘some.value‘: 5 }, function (err, docs) {  // docs is an array});

Model.findone

Model.findOne({ age: 5}, function (err, doc){  // doc is a Document});

Model.findbyid

Model.findById(obj._id, function (err, doc){  // doc is a Document});

Model.count

Model.count(conditions, callback);

Model.remove

Model.remove(conditions, callback);

Model.distinct

Model.distinct(field, conditions, callback);

Model.where

Model.where(‘age‘).gte(25).where(‘tags‘).in([‘movie‘, ‘music‘, ‘art‘]).select(‘name‘, ‘age‘, ‘tags‘).skip(20).limit(10).asc(‘age‘).slaveOk().hint({ age: 1, name: 1 }).exec(callback);

Model. $where

Model.$where(‘this.firstname === this.lastname‘).exec(callback)

Cursor Handling:

var query = Model.find({});query.where(‘field‘, 5);query.limit(5);query.skip(100);query.exec(function (err, docs) {  // called when the `query.complete` or `query.error` are called  // internally});

Model.update

var conditions = { name: ‘borne‘ }// 条件  , update = { $inc: { visits: 1 }}//改动  , options = { multi: true };//选项 multi 改动多个 Model.update(conditions, update, options, callback);function callback (err, numAffected) {  // numAffected is the number of updated documents})

Model.findOne({ name: ‘borne‘ }, function (err, doc){//doc 是模型  doc.name = ‘jason borne‘;  doc.visits.$inc();  doc.save();});

Mongoose Database Operations 3