問題描述

自己測試過成功的樣例,自己新建了個(gè)集合插入了幾條數(shù)據(jù)：

//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); }});

數(shù)據(jù)是可以都拿到的

但是我去試自己爬蟲爬到的數(shù)據(jù)集合，只取4條數(shù)據(jù)出來，就有問題:

//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); }});

然后卡這兒就不會動(dòng)了，代碼都是一致的，怎么就取不出數(shù)據(jù)來呢，求解

問題解答

感覺你遇到的情況是cursor是空的。

檢查一下：

1、在mongo下面使用相同的條件查詢一下，看是否有返回的文檔。