毕业设计基于node.js的学生信息管理系统源码.zip

# 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 require('mongodb').connect(uri, function (err, db) { if (err) return handleError(err); // get a collection var collection = db.collection('artists'); // pass it to the constructor mquery(collection).find({..}, callback); // or pass it to the collection method mquery().find({..}).collection(collection).exec(callback) // or better yet, create a custom query constructor that has it always set var Artist = mquery(collection).toConstructor(); Artist().find(..).where(..).exec(callback) }) ``` `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 - [find](#find) - [findOne](#findOne) - [count](#count) - [remove](#remove) - [update](#update) - [findOneAndUpdate](#findoneandupdate) - [findOneAndDelete, findOneAndRemove](#findoneandremove) - [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) - [or](#or) - [polygon](#polygon) - [regex](#regex) - [select](#select) - [selected](#selected) - [selectedInclusively](#selectedinclusively) - [selectedExclusively](#selectedexclusively) - [size](#size) - [slice](#slice) - [within](#within) - [where](#where) - [$where](#where-1) - [batchSize](#batchsize) - [collation](#collation) - [comment](#comment) - [hint](#hint) - [j](#j) - [limit](#limit) - [maxScan](#maxscan) - [maxTime, maxTimeMS](#maxtime) - [skip](#skip) - [sort](#sort) - [read, setReadPreference](#read) - [readConcern, r](#readconcern) - [slaveOk](#slaveok) - [snapshot](#snapshot) - [tailable](#tailable) - [writeConcern, w](#writeconcern) - [wtimeout, wTimeout](#wtimeout) ## Helpers - [collection](#collection) - [then](#then) - [thunk](#thunk) - [merge](#mergeobject) - [setOptions](#setoptionsoptions) - [setTraceFunction](#settracefunctionfunc) - [mquery.setGlobalTraceFunction](#mquerysetglobaltracefunctionfunc) - [mquery.canMerge](#mquerycanmerge) - [mquery.use$geoWithin](#mqueryusegeowithin) ### find() Declares this query a _find_ query. Optionally pass a match clause and / or callback. If a callback is passed the query is executed. ```js mquery().find() mquery().find(match) mquery().find(callback) mquery().find(match, function (err, docs) { assert(Array.isArray(docs)); }) ``` ### findOne() Declares this query a _findOne_ query. Optionally pass a match clause and / or callback. If a callback is passed the query is executed. ```js mquery().findOne() mquery().findOne(match) mquery().findOne(callback) mquery().findOne(match, function (err, doc) { if (doc) { // the document may not be found console.log(doc); } }) ``` ### count() Declares this query a _count_ query. Optionally pass a match clause and / or callback. If a callback is passed the query is executed. ```js mquery().count() mquery().count(match) mquery().count(callback) mquery().count(match, function (err, number){ console.log('we found %d matching documents', number); }) ``` ### remove() Declares this query a _remove_ query. Optionally pass a match clause and / or callback. If a callback is passed the query is executed. ```js mquery().remove() mquery().remove(match) mquery().remove(callback) mquery().remove(match, function (err){}) ``` ### update() Declares this query an _update_ query. Optionally pass an update document, match clause, options or callback. If a callback is passed, the query is executed. To force execution without passing a callback, run `update(true)`. ```js mquery().update() mquery().update(match, updateDocument) mquery().update(match, updateDocument, options) // the following all execute the command mquery().update(callback) mquery().update({$set: updateDocument, callback) mquery().update(match, updateDocument, callback) mquery().update(match, updateDocument, options, function (err, result){}) mquery().update(true) // executes (unsafe write) ``` ##### the update document All paths passed that are not `$atomic` operations will become `$set` ops. For example: ```js mquery(collection).where({ _id: id }).update({ title: 'words' }, callback) ``` becomes ```js collection.update({ _id: id }, { $set: { title: 'words' }}, callback) ``` This behavior can be overridden using the `overwrite` option (see below). ##### options Options are passed to the `setOptions()` method. - overwrite Passing an empty object `{ }` as the update document will result in a no-op unless the `overwrite` option is passed. Without the `overwrite` option, the update operation will be ignored and the callback executed without sending the command to MongoDB to prevent accidently overwritting documents in the collection. ```js var q = mquery(collection).where({ _id: id }).setOptions({ overwrite: true }); q.update({ }, callback); // overwrite with an empty doc ``` The `overwrite` option isn't just for empty objects, it also provides a means to override the default `$set` conversion and send the update document as is. ```js // create a base query var base = mquery({ _id: 108 }).collection(collection).toConstructor(); base().findOne(function (err, doc) { console.log(doc); // { _id: 108, name: 'cajon' }) base().setOptions({ overwrite: true }).update({ changed: true }, function (err) { base.findOne(function (err, doc) { console.log(doc); // { _id: 108, changed: true }) - the doc was overwritten }); }); }) ``` - multi Updates only modify a single document by default. To update multiple documents, set the `multi` option to `true`. ```js mquery() .collection(coll) .update({ name: /^match/ }, { $addToSet: { arr: 4 }}, { multi: true }, callback) // another way of doing it mquery({ name: /^match/ }) .collection(coll) .setOptions({ multi: true }) .update({ $addToSet: { arr: 4 }}, callback) // update multiple documents with an empty doc var q = mquery(collection).where({ name: /^match/ }); q.setOptions({ multi: true, overwrite: true }) q.update({ }); q.update(function (err, result) { console.log(arguments); }); ``` ### findOneAndUpdate() Declares this query a _findAndModify_ with update query. Optionally pass a match clause, update document, options, or callback. If a callback is passed, the query is executed. When executed, the first matching document (if found) is modified according to the update document and passed back to the callback. ##### options Options are passed to the `setOptions()` method. - `new`: boolean - true to return the modified document rather than the original. defaults to true - `upsert`: boolean - creates the object if it doesn't exist. defaults to false - `sort`: if multiple docs are found by the match condition, set