Question

我有文件要通过mongoose向mongo添加数据：

var mongoose = require('mongoose');
var mongoDB = 'mongodb://myuser:mypass@ds145293.mlab.com:45293/employees';
mongoose.connect(mongoDB);
mongoose.Promise = global.Promise;
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'MongoDB connection error:'))
db.once('open',function(){
    console.log('connected')
    var kittySchema = mongoose.Schema({
        name: String
      });
    var Kitten = mongoose.model('Kitten', kittySchema);
    var fluffy = new Kitten({ name: 'fluffy' });
    fluffy.save(function (err, fluffy) {
        if (err) return console.error(err);
        console.log('saved');
      });
})
mongoose.connection.close()

从猫鼬站点几乎逐字复制。我能够连接到数据库，但是我没有第二个控制台日志。我有数据库但没有集合。这是问题吗？

Answer 1

将mongoose.Schema替换为new Schema，我也不认为此mongoose.Promise = global.Promise是必需的。

Answer 2

在关闭数据库之前无法完成保存。有很多选项可以等待保存。我喜欢异步/等待。

编辑：对不起，那太快了。更新了示例。

var mongoose = require('mongoose');
var mongoDB = 'mongodb://localhost/something';

async function run() {
    await mongoose.connect(mongoDB);
    console.log('connected')
    var kittySchema = new mongoose.Schema({ name: String }); 
    var Kitten = mongoose.model('Kitten', kittySchema);
    var fluffy = new Kitten({ name: 'fluffy' });
    await fluffy.save();
    console.log('saved');
    mongoose.connection.close();
}

run();

或者您也可以在保存后将其移到附近：

var mongoose = require('mongoose');
var mongoDB = 'mongodb://localhost/something';

mongoose.connect(mongoDB);
mongoose.Promise = global.Promise;
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'MongoDB connection error:'))
db.once('open', function () { 
    console.log('connected')
    var kittySchema = new mongoose.Schema({name: String });
    var Kitten = mongoose.model('Kitten', kittySchema);
    var fluffy = new Kitten({ name: 'fluffy' });
    fluffy.save(function (err, fluffy) {
        if (err) return console.error(err);
        console.log('saved');
        mongoose.connection.close();
    });
})

猫鼬保存（例如从其网站无法正常工作的示例）

2 个答案: