我正在尝试将多个MongoDB数据库连接到一个Node.js项目中。这是我目前的结构和问题。
节点版本: v6.12.1
Express.js版本: 4.16.2
猫鼬版本: 4.13.6
当前结构:
primaryDB.js
var mongoose = require('mongoose');
var configDB = require('./database.js');
//Connect to MongoDB via Mongoose
mongoose.Promise = require('bluebird');
//mongoose.Promise = global.Promise;
mongoose.connect(configDB.url, { useMongoClient: true });
//Check for successful DB connection
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function() {
console.log("Primary DB Successfully Connected..");
});
module.exports = mongoose;
secondaryDB.js
var mongoose = require('mongoose');
mongoose.connect('mongodb://mongodb_address_goes_here:27017/db_name', { useMongoClient: true });
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', function() {
console.log("Secondary DB Successfully Connected..");
});
module.exports = mongoose;
然后将每个数据库连接分别导入其模式文件,模式文件从模式文件中导出模块。
手头的问题
当我运行我的应用程序时它启动正常并成功连接到两个DB但是我相信mongoose要么被覆盖了,要么因为我可以在主要上执行findOne()
命令但是次要失败,反之亦然
示例:
var async = require('async');
var primaryModel = require('../../../models/general/primary');
var SecondaryModel = require('../../../models/general/secondary');
function getInfo() {
async.waterfall([
getPrimaryName,
getSecondaryName
], function (err, info) {
});
};
function getPrimaryName(callback){
Primary.findOne({}, function (err, primaryInfo){
if (err) {
console.log("Error" + err);
}
console.log('Primary info is : ' + primaryInfo);
callback(null,primaryInfo);
});
}
function getSecondaryName(primaryInfo, callback) {
console.log(primaryInfo); //Make sure its being passed
Secondary.findOne({}, function (err, secondaryInfo) {
if (err) {
console.log("Error" + err);
}
console.log('Secondary Info is : ' + secondaryInfo);
callback(null, secondaryInfo);
});
}
上面的问题是我可能会从调用Primary而不是Secondary调用数据。我再次相信这是被某种被覆盖的东西。
任何帮助表示赞赏。对于详细程度感到抱歉。
答案 0 :(得分:2)
使用mongoose.createConnection
创建您的连接
所以
const conn1 = mongoose.createConnection('first server options')
const conn2 = mongoose.createConnection('second server options')
在这里阅读更多内容 http://mongoosejs.com/docs/connections.html#multiple_connections