API文档： http://mongoosejs.com/docs/guide.html

cnpm install mongoose --save

二、创建一个model模型

<span style="color: #008000">//</span><span style="color: #008000"> goods.js</span>
<span style="color: #0000ff">var</span> mongoose = require(‘mongoose‘<span style="color: #000000">);
</span><span style="color: #0000ff">var</span> Schema =<span style="color: #000000"> mongoose.Schema;
</span><span style="color: #008000">//</span><span style="color: #008000"> 定义一个Schema</span>
<span style="color: #0000ff">var</span> produtSchema = <span style="color: #0000ff">new</span><span style="color: #000000"> Schema({
    </span>‘productId‘:String,   <span style="color: #008000">//</span><span style="color: #008000"> 或者 ‘productId‘:{type:String}</span>
    ‘productName‘<span style="color: #000000">:String,
    </span>‘salePrice‘<span style="color: #000000">:Number,
    </span>‘productImage‘<span style="color: #000000">:String
})
</span><span style="color: #008000">//</span><span style="color: #008000"> 输出(导出)</span>
module.exports = mongoose.model(‘good‘,produtSchema); <span style="color: #008000">//</span><span style="color: #008000"> 定义一个good商品模型，可以根据这个商品模型调用其API方法。</span><span style="color: #008000">
//</span><span style="color: #008000"> 这个模型定义的是数据库dumall的goods集合数据，所以这个model取名good是对应这个集合，连接数据库之后，这个模型会根据名字的复数形式"goods"来查找数据集合。</span><span style="color: #008000">
//</span><span style="color: #008000"> module.exports = mongoose.model(‘good‘,produtSchema,‘goods‘); 也可以后面注明链接的是数据库的goods集合</span>

三、连接数据库

<span style="color: #008000">//</span><span style="color: #008000"> db.js</span>
<span style="color: #0000ff">var</span> mongoose = require(‘mongoose‘<span style="color: #000000">);
</span><span style="color: #0000ff">var</span> Goods = require(‘./goods.js‘<span style="color: #000000">);
</span><span style="color: #008000">//</span><span style="color: #008000"> 链接MongoDB数据库,数据库的名称叫dumall</span>
mongoose.connect(‘mongodb://127.0.0.1:27017/dumall‘);  <span style="color: #008000">//</span><span style="color: #008000"> 若是带账号密码的：‘mongodb://root:123456@127.0.0.1:27017/dumall‘</span>
<span style="color: #008000">//</span><span style="color: #008000"> 连接成功操作</span>
mongoose.connection.on("connected",<span style="color: #0000ff">function</span><span style="color: #000000">(){
    console.log(</span>"MongoDB connected success."<span style="color: #000000">)
})
</span><span style="color: #008000">//</span><span style="color: #008000"> 连接失败操作</span>
mongoose.connection.on("error",<span style="color: #0000ff">function</span><span style="color: #000000">(){
    console.log(</span>"MongoDB connected fail."<span style="color: #000000">)
})
</span><span style="color: #008000">//</span><span style="color: #008000"> 连接断开操作</span>
mongoose.connection.on("disconnected",<span style="color: #0000ff">function</span><span style="color: #000000">(){
    console.log(</span>"MongoDB connected disconnected."<span style="color: #000000">)
})
</span><span style="color: #008000">//</span><span style="color: #008000"> 连接成功之后，用model的good商品模型查询到数据库的goods集合。</span>
Goods.find({},<span style="color: #0000ff">function</span><span style="color: #000000">(err, doc){ 
    </span><span style="color: #0000ff">if</span><span style="color: #000000">(err) {
        console.log(err.message)
    }</span><span style="color: #0000ff">else</span><span style="color: #000000">{
        console.log(doc)
    }
})</span>

doc的内容：

mongoose查询数据库步骤

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