Javascript Mongodb find不';t返回数组
我不确定我错过了什么。我想在Nodejs函数中查询MongoDB数据库。下面的Javascript Mongodb find不';t返回数组,javascript,node.js,mongodb,asynchronous,promise,Javascript,Node.js,Mongodb,Asynchronous,Promise,我不确定我错过了什么。我想在Nodejs函数中查询MongoDB数据库。下面的jobs变量保持返回未定义。我希望它返回一个数组。如果在collection.find中运行console.log,它将输出我试图返回的数组 async function getDataFromMongoDB(page) { const MongoClient = require("mongodb").MongoClient; const uri = "mongodb://localhost:3001";
jobs
变量保持返回未定义。我希望它返回一个数组。如果在collection.find中运行console.log,它将输出我试图返回的数组
async function getDataFromMongoDB(page) {
const MongoClient = require("mongodb").MongoClient;
const uri = "mongodb://localhost:3001";
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect(async function(err) {
console.log(5, err);
const collection = client.db("meteor").collection("jobs");
const jobs = await collection.find().toArray((err, items) => {
return items;
});
console.log("jobs", jobs);
// return jobs;
// console.log(jobs);
// perform actions on the collection object
client.close();
});
}
client.connect
是async
函数并接受回调。您无法访问回调范围之外的作业
变量
为此,您可以将client.connect
方法包装到函数中,并从中返回承诺
async function getDataFromMongoDB(page) {
const MongoClient = require("mongodb").MongoClient;
const uri = "mongodb://localhost:3001";
const client2 = new MongoClient(uri, { useNewUrlParser: true });
const client = await connectToMongodb(client2)
const collection = client.db("meteor").collection("jobs");
const jobs = await collection.find().toArray();
console.log("jobs", jobs);
}
connectToMongodb(client) {
return new Promise((resolve, reject) => {
client.connect(function(err) {
return resolve(client)
});
})
}
尝试const jobs=wait collection.find().toArray();console.log(jobs)
谢谢,@Subburaj可以工作,但我仍然无法从客户端.connect中获取作业。