为什么插入不是这里的功能？

Question

dnp.js：5未捕获TypeError：db.collection（...）。insert不是函数     在addBusiness（dnp.js：5）

function addBusiness() {
db.collection("businesses").insert({owner_id : client.authedId(), 
                                     city: "mycity", 
                                     county: "mycounty", 
                                     name: "mybusiness", 
                                     state: "myState",
                                     street: "mystreet",
                                     zip: "myzip"});

}