猫鼬多重连接
猫鼬多重连接
提问于 2015-10-02 11:44:21
目前，我有用于连接mongoose.js的代码。
var mongoose = require('mongoose');
var uriUtil = require('mongodb-uri');
var mongodbUri = 'mongodb://localhost/db_name';
var mongooseUri = uriUtil.formatMongoose(mongodbUri);
mongoose.connect(mongooseUri);
module.exports = mongoose;需要连接的文件是test.js。
var mongoose = require('../model/mongoose');
var schema = mongoose.Schema({...});如何更新mongoose.js以使用mongoose.createConnection的多个连接(.)功能？
当我做这样的更改时，我只对一个连接进行更改：
var mongoose = require('mongoose');
mongoose.createConnection('mongodb://localhost/db_name');
mongoose.open('localhost');
module.exports = mongoose;我得到“未定义不是一个函数”。如果我使用这个代码：
var mongoose = require('mongoose');
db = mongoose.createConnection('mongodb://localhost/db_name');
db.open('localhost');
module.exports = mongoose;我得到了“错误:试图打开未关闭的连接”
有什么建议吗？
回答 3
Stack Overflow用户
回答已采纳
发布于 2015-10-02 14:05:55
通过连接池http://mongoosejs.com/docs/connections.html处理连接
您可以使用server: {poolSize: 5}选项来增加/减少池(并行连接数)
如果您需要连接到不同的数据库，请在这里查看Mongoose and multiple database in single node.js project
多个连接的示例：
var mongoose = require('mongoose')
var conn = mongoose.createConnection('mongodb://localhost/db1');
var conn2 = mongoose.createConnection('mongodb://localhost/db2');
var Schema = new mongoose.Schema({})
var model1 = conn.model('User', Schema);
var model2 = conn2.model('Item', Schema);
model1.find({}, function() {
console.log("this will print out last");
});
model2.find({}, function() {
console.log("this will print out first");
});Stack Overflow用户
发布于 2015-10-03 13:48:09
好的。通过您的例子，我找到了一个适合我需要的解决方案。
mongoose.js
var mongoose = require('mongoose');
mongoose.main_conn = mongoose.createConnection('mongodb://localhost/main');
mongoose.admin_conn = mongoose.createConnection('mongodb://localhost/admin');
module.exports = mongoose;content.js
var mongoose = require('../model/mongoose');
var schema = mongoose.Schema({...});
/// functions here
schema.statics.func_a(){...};
schema.statics.func_b(){...};
// And finaly updated only one line
//exports.Content = mongoose.model('Content', schema);
exports.Content = mongoose.main_conn.model('Content', schema);唯一的问题是，可以将连接对象添加到mongoose对象中，或者可能有更优雅的解决方案。
Stack Overflow用户
发布于 2017-03-03 03:53:31
config.js
module.exports = {
default: 'main',
main: 'mongodb://localhost/main',
admin: 'mongodb://localhost/admin',
};connection.js
const mongoose = require('mongoose');
const config = require('./config');
mongoose.Promise = global.Promise;
function createConnection(name) {
return mongoose.createConnection(config[name]);
}
module.exports = createConnection(config[config.default]);
module.exports.on = createConnection;model.js (自定义类)
const connection = require('./connection');
class Model {
constructor(name, data) {
this.data = data;
return this.connection().model(name, data.schema);
}
connection() {
if (this.data.connection) {
return connection.on(this.data.connection);
}
return connection;
}
}
module.exports = Model;user.js
const Schema = require('mongoose').Schema;
const conn = require('./connection');
const Model = require('./model');
const userSchema = new Schema({
name: String,
email: String,
password: String
});
// USING MONGOOSE MODEL
// default connection
const UserM1 = conn.model('User', userSchema);
// admin connection
const UserM2 = conn.on('admin').model('User', userSchema);
// USING CUSTOM MODEL
// default connection
const UserC1 = new Model('User', {
schema: userSchema
});
// admin connection
const UserC2 = new Model('User', {
schema: userSchema,
connection: 'admin'
});页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/32906467
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