node.js - 使用mongoose的cursor的问题

问题描述

自己测试过成功的样例,自己新建了个集合插入了几条数据：

//testSchema.jsvar mongoose = require(’./db.js’), Schema = mongoose.Schema;var TestSchema = new Schema({ name: {type: String}, age: {type: Number}})var TestModel = mongoose.model(’stream’, TestSchema, ’stream’);var cache = [];var co = require(’co’);co(function*() { 'use strict'; const cursor = TestModel.find({}).cursor(); for (let doc = yield cursor.next(); doc != null; doc = yield cursor.next()) {console.log(doc); }});

数据是可以都拿到的

但是我去试自己爬虫爬到的数据集合，只取4条数据出来，就有问题:

//test.jsvar mongoose = require(’./db.js’), Schema = mongoose.Schema;var LagouSchema = new Schema({ name: {type: String}, cid: {type: Number}, process: {type: String}, content: {type: String}, url: {type: String}, tag: {type: String}, total: {type: Number}, salary: {type: Array}});var Lagou = mongoose.model(’lagou’, LagouSchema, ’lagou’);var co = require(’co’);co(function*() { 'use strict'; const cursor = Lagou.find({’cid’: {$gte:22777, $lte:22780}}).cursor(); for (let doc = yield cursor.next(); doc != null; doc = yield cursor.next()) {console.log(doc); }});

然后卡这儿就不会动了，代码都是一致的，怎么就取不出数据来呢，求解

问题解答

感觉你遇到的情况是cursor是空的。

检查一下：

1、在mongo下面使用相同的条件查询一下，看是否有返回的文档。