ajax-promise-axios练习

# mquery `mquery` is a fluent mongodb query builder designed to run in multiple environments. [](https://travis-ci.org/aheckmann/mquery) [](http://badge.fury.io/js/mquery) [](https://www.npmjs.com/package/mquery) ## Features - fluent query builder api - custom base query support - MongoDB 2.4 geoJSON support - method + option combinations validation - node.js driver compatibility - environment detection - [debug](https://github.com/visionmedia/debug) support - separated collection implementations for maximum flexibility ## Use ```js const mongo = require('mongodb'); const client = new mongo.MongoClient(uri); await client.connect(); // get a collection const collection = client.collection('artists'); // pass it to the constructor await mquery(collection).find({...}); // or pass it to the collection method const docs = await mquery().find({...}).collection(collection); // or better yet, create a custom query constructor that has it always set const Artist = mquery(collection).toConstructor(); const docs = await Artist().find(...).where(...); ``` `mquery` requires a collection object to work with. In the example above we just pass the collection object created using the official [MongoDB driver](https://github.com/mongodb/node-mongodb-native). ## Fluent API - [mquery](#mquery) - [Features](#features) - [Use](#use) - [Fluent API](#fluent-api) - [Helpers](#helpers) - [find()](#find) - [findOne()](#findone) - [count()](#count) - [findOneAndUpdate()](#findoneandupdate) - [findOneAndUpdate() options](#findoneandupdate-options) - [findOneAndRemove()](#findoneandremove) - [findOneAndRemove() options](#findoneandremove-options) - [distinct()](#distinct) - [exec()](#exec) - [stream()](#stream) - [all()](#all) - [and()](#and) - [box()](#box) - [circle()](#circle) - [elemMatch()](#elemmatch) - [equals()](#equals) - [exists()](#exists) - [geometry()](#geometry) - [gt()](#gt) - [gte()](#gte) - [in()](#in) - [intersects()](#intersects) - [lt()](#lt) - [lte()](#lte) - [maxDistance()](#maxdistance) - [mod()](#mod) - [ne()](#ne) - [nin()](#nin) - [nor()](#nor) - [near()](#near) - [Example](#example) - [or()](#or) - [polygon()](#polygon) - [regex()](#regex) - [select()](#select) - [String syntax](#string-syntax) - [selected()](#selected) - [selectedInclusively()](#selectedinclusively) - [selectedExclusively()](#selectedexclusively) - [size()](#size) - [slice()](#slice) - [within()](#within) - [where()](#where) - [$where()](#where-1) - [batchSize()](#batchsize) - [collation()](#collation) - [comment()](#comment) - [hint()](#hint) - [j()](#j) - [limit()](#limit) - [maxTime()](#maxtime) - [skip()](#skip) - [sort()](#sort) - [read()](#read) - [Preferences:](#preferences) - [Preference Tags:](#preference-tags) - [readConcern()](#readconcern) - [Read Concern Level:](#read-concern-level) - [writeConcern()](#writeconcern) - [Write Concern:](#write-concern) - [slaveOk()](#slaveok) - [tailable()](#tailable) - [wtimeout()](#wtimeout) - [Helpers](#helpers-1) - [collection()](#collection) - [then()](#then) - [merge(object)](#mergeobject) - [setOptions(options)](#setoptionsoptions) - [setOptions() options](#setoptions-options) - [setTraceFunction(func)](#settracefunctionfunc) - [mquery.setGlobalTraceFunction(func)](#mquerysetglobaltracefunctionfunc) - [mquery.canMerge(conditions)](#mquerycanmergeconditions) - [mquery.use$geoWithin](#mqueryusegeowithin) - [Custom Base Queries](#custom-base-queries) - [Validation](#validation) - [Debug support](#debug-support) - [General compatibility](#general-compatibility) - [ObjectIds](#objectids) - [Read Preferences](#read-preferences) - [Future goals](#future-goals) - [Installation](#installation) - [License](#license) ## Helpers - [collection](#collection) - [then](#then) - [merge](#mergeobject) - [setOptions](#setoptionsoptions) - [setTraceFunction](#settracefunctionfunc) - [mquery.setGlobalTraceFunction](#mquerysetglobaltracefunctionfunc) - [mquery.canMerge](#mquerycanmergeconditions) - [mquery.use$geoWithin](#mqueryusegeowithin) ### find() Declares this query a _find_ query. Optionally pass a match clause. ```js mquery().find() mquery().find(match) await mquery().find() const docs = await mquery().find(match); assert(Array.isArray(docs)); ``` ### findOne() Declares this query a _findOne_ query. Optionally pass a match clause. ```js mquery().findOne() mquery().findOne(match) await mquery().findOne() const doc = await mquery().findOne(match); if (doc) { // the document may not be found console.log(doc); } ``` ### count() Declares this query a _count_ query. Optionally pass a match clause. ```js mquery().count() mquery().count(match) await mquery().count() const number = await mquery().count(match); console.log('we found %d matching documents', number); ``` ### findOneAndUpdate() Declares this query a _findAndModify_ with update query. Optionally pass a match clause, update document, options. When executed, the first matching document (if found) is modified according to the update document and passed back. #### findOneAndUpdate() options Options are passed to the `setOptions()` method. - `returnDocument`: string - `'after'` to return the modified document rather than the original. defaults to `'before'` - `upsert`: boolean - creates the object if it doesn't exist. defaults to false - `sort`: if multiple docs are found by the match condition, sets the sort order to choose which doc to update ```js query.findOneAndUpdate() query.findOneAndUpdate(updateDocument) query.findOneAndUpdate(match, updateDocument) query.findOneAndUpdate(match, updateDocument, options) // the following all execute the command await query.findOneAndUpdate() await query.findOneAndUpdate(updateDocument) await query.findOneAndUpdate(match, updateDocument) const doc = await await query.findOneAndUpdate(match, updateDocument, options); if (doc) { // the document may not be found console.log(doc); } ``` ### findOneAndRemove() Declares this query a _findAndModify_ with remove query. Alias of findOneAndDelete. Optionally pass a match clause, options. When executed, the first matching document (if found) is modified according to the update document, removed from the collection and passed as a result. #### findOneAndRemove() options Options are passed to the `setOptions()` method. - `sort`: if multiple docs are found by the condition, sets the sort order to choose which doc to modify and remove ```js A.where().findOneAndDelete() A.where().findOneAndRemove() A.where().findOneAndRemove(match) A.where().findOneAndRemove(match, options) // the following all execute the command await A.where().findOneAndRemove() await A.where().findOneAndRemove(match) const doc = await A.where().findOneAndRemove(match, options); if (doc) { // the document may not be found console.log(doc); } ``` ### distinct() Declares this query a _distinct_ query. Optionally pass the distinct field, a match clause. ```js mquery().distinct() mquery().distinct(match) mquery().distinct(match, field) mquery().distinct(field) // the following all execute the command await mquery().distinct() await mquery().distinct(field) await mquery().distinct(match) const result = await mquery().distinct(match, field); console.log(result); ``` ### exec() Executes the query. ```js const docs = await mquery().findOne().where('route').intersects(polygon).exec() ``` ### stream() Executes the query and returns a stream. ```js var stream = mquery().find().stream(options); s