Mongoose入门介绍
发布于 4年前 作者 xuanhou 7826 次浏览 最后一次编辑是 3年前
什么是Mongoose?

Mongoose是基于node-mongodb-native开发的MongoDB nodejs驱动，可以在异步的环境下执行。

如何安装Mongoose?



npm install mongoose



如何使用Mongoose?


  • test.js代码：


var mongoose = require('mongoose')

  , Schema = mongoose.Schema



mongoose.connect('mongodb://localhost/test');



var TestSchema = new Schema({

   user_id        : {type : Number, index : true}

  ,username       : {type : String}

});



var model_name = coll_name = 'taobao';

mongoose.model(model_name, TestSchema, coll_name);



var TAOBAO  = mongoose.model(model_name, coll_name);

var taobao  = new TAOBAO();

taobao.user_id  = 1;

taobao.username = 'xuanhou';

taobao.save(function(err) {

  if (err) {

    console.log('save failed');

  }

  console.log('save success');

});


  • 执行test.js


node test.js

  • 查看是否执行成功：


[xuanhou.ysh[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[@XXXX](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX)](/user/XXXX) test]$ mongo

MongoDB shell version: 1.8.0

connecting to: test

> show collections

system.indexes

taobao

> db.taobao.find()

{ "_id" : ObjectId("4db65fafcb4312401d000001"), "user_id" : 1, "username" : "xuanhou" }

> exit

bye

为什么还要基于node-mongodb-native开发mongoose呢？

下面是node-mongodb-native实现的代码相信能让你了解为什么很多人选择Mongoose（callback层数太多）: 



var client = new Db('integration_tests_20', new Server("127.0.0.1", 27017, {}));

  client.open(function(err, p_client) {

        client.createCollection('test_insert', function(err, collection) {

          client.collection('test_insert', function(err, collection) {

            for(var i = 1; i < 1000; i++) {

              collection.insert({c:1}, function(err, docs) {});

            }



            collection.insert({a:2}, function(err, docs) {

              collection.insert({a:3}, function(err, docs) {

                collection.count(function(err, count) {

                  test.assertEquals(1001, count);

                  // Locate all the entries using find

                  collection.find(function(err, cursor) {

                    cursor.toArray(function(err, results) {

                      test.assertEquals(1001, results.length);

                      test.assertTrue(results[0] != null);



                      // Let's close the db

                      client.close();

                    });

                  });

                });

              });

            });

          });

        });

  });

目前Mongoose的开发情况如何？

Mongoose已经实现了大部分功能，但还有些Mongodb提供的feature没有实现，所以也给使用者提供了打补丁的机会，下面是我最近给Mongoose打的两个补丁：

  • 让mongoose支持distinct操作


Index: model.js

===================================================================

--- model.js    (revision 12218)

+++ model.js    (working copy)

@@ -492,6 +492,34 @@

};



/**

+ * `distinct` values for key

+ *

+ * [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[@param](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param) {String} key

+ * [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[@param](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param) {Object} conditions

+ * [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[@param](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param) {Function} optional callback

+ * [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[@api](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api) public

+ */

+

+Model.distinct = function (key, conditions, callback) {

+  if ('function' == typeof conditions) {

+    callback = conditions;

+    conditions = {};

+  }

+  var query = new Query(conditions, key).bind(this, 'distinct');

+  if ('undefined' == typeof callback)

+    return query;

+  var cQuery;

+  if (cQuery = this._cumulativeQuery) {

+    merge(query._conditions, cQuery._conditions);

+    if (query.options && cQuery.options)

+      merge(query.options, cQuery.options);

+    delete this._cumulativeQuery;

+  }

+  if (!query.model) query.bind(this, 'distinct');

+  return query.distinct(callback);

+};

+

+/**

* `where` enables a very nice sugary api for doing your queries.

* For example, instead of writing:

*     User.find({age: {$gte: 21, $lte: 65}}, callback);

Index: query.js

===================================================================

--- query.js    (revision 12218)

+++ query.js    (working copy)

@@ -11,6 +11,10 @@



function Query (criteria, options) {

options = this.options = options || {};

+  if ('string' == typeof options) {

+    this._key = options;

+    options = this.options = {};

+  }

this.safe = options.safe

this._conditions = {};

if (criteria) this.find(criteria);

@@ -730,6 +734,24 @@

};



/**

+ * Casts this._conditions and sends a distinct

+ * command to mongodb. Invokes a callback upon

+ * receiving results.

+ *

+ * [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[@param](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param)](/user/param) {Function} callback fn(err, cardinality)

+ * [[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[@api](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api)](/user/api) public

+ */

+Query.prototype.distinct = function (callback) {

+  this.op = 'distinct';

+  var model = this.model;

+  this.cast(model);

+  var castQuery = this._conditions;

+  var key = this._key;

+  model.collection.distinct(key, castQuery, callback);

+  return this;

+};

+

+/**

* Casts the query, sends the update command to mongodb.

* If there is an error, the callback handles it. Otherwise,

* we just invoke the callback whereout passing it an error.


  • 让$gt/$gte/$lt/$lte等操作支持字符串参数


Index: string.js

===================================================================

--- string.js    (revision 12218)

+++ string.js    (working copy)

@@ -139,10 +139,15 @@

}



SchemaString.prototype.$conditionalHandlers = {

-    '$ne': handleSingle

+    '$lt': handleSingle

+  , '$lte': handleSingle

+  , '$gt': handleSingle

+  , '$gte': handleSingle

+  , '$ne': handleSingle

, '$in': handleArray

, '$nin': handleArray

};

+

SchemaString.prototype.castForQuery = function ($conditional, val) {

var handler;

if (arguments.length === 2) {
9 回复

通过 mongoose 能不能把一个文件存到mongodb数据库中去，希望大家提供思路！！！

我目前是写了一个nodejs负责将CSV文件中的内容导入到mongodb中去的。

1）生成CSV文件（mysql数据库导出的数据）
2）NodeJs每次读一行，然后分割为很多个fields，然后调用save将这些field组成的document插入到mongodb中
3）读取文件结束，关闭连接

mongoose是一个orm，如果只是想简单的读写，不需要定义schema和验证，可以方便的使用mongoq
https://github.com/zzdhidden/mongoq

[…] http://cnodejs.org/blog/?p=824 此条目发表在 未分类 分类目录，贴了 mongodb, mongoose, 学习 […]

[…] http://cnodejs.org/blog/?p=824 此条目发表在 转载 分类目录，贴了 mongodb, mongoose, 学习 […]

你实现mongoose存取文件了吗 存文件就是将文件转成字节流然后存进去 我现在不知道怎么取出来

层数太多那个例子，貌似和node-mongodb-native没关吧？

学习中～

关于第一个例子: helomongoose.model(model_name, TestSchema, coll_name); var TAOBAO = mongoose.model(model_name, coll_name);

为什么这样写？ 表示不是很明白。可以这样吗？

var TAOBAO  = mongoose.model(model_name, TestSchema, coll_name);
回到顶部