Question

我尝试在另一个进程中执行一些数据库操作，所以我使用了child_process。但是我无法从这个过程更新我的数据库：没有连接。

app.js

...
mongoose.connect(mongodb://localhost/myDb);

var db = mongoose.connection;

db.on('error', function () {
  throw new Error('unable to connect to database');
});

// When the connection is disconnected
db.on('disconnected', function () {
  console.log('disconnected');
});

child_express.exec('node ' + __dirname + '/path/to/my/my-service.js', (err, stdout, stderr) => {
  if(err) console.error(stderr);
  else console.log(stdout);
});

我-service.js

MyModel = require('../models/my-model');
...
myModel.updateBook(book);

我-model.js

var mongoose = require('mongoose'),
    Schema = mongoose.Schema;

// console.log(mongoose.connection.readyState); => 0

var bookSchema = new Schema({..});  
var Book = mongoose.model('Book', bookSchema);

exports.updateBook = function(book) {
    Book.find({ bookId: book.bookId }, function (err, book) {
        console.log(book);
    });
};

如何从child_process获取连接？

在child_process中使用数据库

0 个答案: