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MongoDB

问题

你需要与一个MongoDB数据库连接的接口。

解决方案

对于 Node.js

安装

保存记录

mongo = require 'mongodb'

server = new mongo.Server "127.0.0.1", 27017, {}

client = new mongo.Db 'test', server, {w:1}

# save() updates existing records or inserts new ones as needed
exampleSave = (dbErr, collection) ->
    console.log "Unable to access database: #{dbErr}" if dbErr
    collection.save { _id: "my_favorite_latte", flavor: "honeysuckle" }, (err, docs) ->
        console.log "Unable to save record: #{err}" if err
        client.close()

client.open (err, database) ->
    client.collection 'coffeescript_example', exampleSave

查找记录

mongo = require 'mongodb'

server = new mongo.Server "127.0.0.1", 27017, {}

client = new mongo.Db 'test', server, {w:1}

exampleFind = (dbErr, collection) ->
    console.log "Unable to access database: #{dbErr}" if dbErr
    collection.find({ _id: "my_favorite_latte" }).nextObject (err, result) ->
        if err
            console.log "Unable to find record: #{err}"
        else
            console.log result # => {  id: "my_favorite_latte", flavor: "honeysuckle" }
        client.close()

client.open (err, database) ->
    client.collection 'coffeescript_example', exampleFind

对于浏览器

一个基于 REST 的接口在工程中,会提供基于AJAX的访问通道。

讨论

这个方法将save和find分开进单独的实例,其目的是分散MongoDB指定的连接任务的关注点以及回收任务。async 模块可以帮助这样的异步调用。