I'm totally new to mongoDB and not experienced with Node.js so please excuse if the code below is far from perfect.
The goal is to remove a document from a collection, referenced by its _id
. The removal is done (checked in mongo shell), but the code does not end (running node myscript.js
doesn't get my shell back). If I add a db.close()
I get { [MongoError: Connection Closed By Application] name: 'MongoError' }
.
var MongoClient = require("mongodb").MongoClient;
var ObjectID = require("mongodb").ObjectID;
MongoClient.connect('mongodb://localhost/mochatests', function(err, db) {
if (err) {
console.log("error connecting");
throw err;
}
db.collection('contacts', {}, function(err, contacts) {
if (err) {
console.log("error getting collection");
throw err;
}
contacts.remove({_id: ObjectID("52b2f757b8116e1df2eb46ac")}, {safe: true}, function(err, result) {
if (err) {
console.log(err);
throw err;
}
console.log(result);
});
});
db.close();
});
Do I not have to close the connection? What's happening when I'm not closing it and the program doesn't end?
Thanks!
Welcome to asynchronous style:
db.close()
should be in the callback, after removing is done. Example:
MongoClient.connect('mongodb://localhost/mochatests', function(err, db) {
db.collection('contacts', {}, function(err, contacts) {
contacts.remove({_id: ObjectID("52b2f757b8116e1df2eb46ac")}, function(err, result) {
if (err) {
console.log(err);
}
console.log(result);
db.close();
});
});
});
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.