Node.js 猫鼬多重连接

目前我的连接有以下代码mongoose.js：

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;

var mongoose = require('../model/mongoose');
var schema = mongoose.Schema({...});

需要连接的文件是test.js：

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;

var mongoose = require('../model/mongoose');
var schema = mongoose.Schema({...});

---

---

如何更新mongoose.js以使用mongoose.createConnection（…）函数的多个连接

当我进行这样的更改时，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“未定义不是函数”。 如果我使用此代码：

var mongoose = require('mongoose');
db = mongoose.createConnection('mongodb://localhost/db_name');
db.open('localhost');
module.exports = mongoose;

我得到“错误：试图打开未关闭的连接”

---

有什么建议吗？

Mongoose通过连接池处理连接

您可以使用

server:{poolSize:5}

选项来增加/减少池（并行连接数）

如果需要连接到不同的数据库，请查看此处

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");
});

---

嗯。以你为例，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;

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);

module.exports = {
    default: 'main',
    main: 'mongodb://localhost/main',
    admin: 'mongodb://localhost/admin',
};

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;

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;

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' 
});

content.js

var mongoose = require('mongoose');
mongoose.main_conn = mongoose.createConnection('mongodb://localhost/main');
mongoose.admin_conn = mongoose.createConnection('mongodb://localhost/admin');
module.exports = mongoose;

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);

module.exports = {
    default: 'main',
    main: 'mongodb://localhost/main',
    admin: 'mongodb://localhost/admin',
};

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;

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;

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' 
});

---

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

config.js

var mongoose = require('mongoose');
mongoose.main_conn = mongoose.createConnection('mongodb://localhost/main');
mongoose.admin_conn = mongoose.createConnection('mongodb://localhost/admin');
module.exports = mongoose;

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);

module.exports = {
    default: 'main',
    main: 'mongodb://localhost/main',
    admin: 'mongodb://localhost/admin',
};

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;

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;

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' 
});

connection.js

var mongoose = require('mongoose');
mongoose.main_conn = mongoose.createConnection('mongodb://localhost/main');
mongoose.admin_conn = mongoose.createConnection('mongodb://localhost/admin');
module.exports = mongoose;

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);

module.exports = {
    default: 'main',
    main: 'mongodb://localhost/main',
    admin: 'mongodb://localhost/admin',
};

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;

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;

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' 
});

model.js（自定义类）

user.js

var mongoose = require('mongoose');
mongoose.main_conn = mongoose.createConnection('mongodb://localhost/main');
mongoose.admin_conn = mongoose.createConnection('mongodb://localhost/admin');
module.exports = mongoose;

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);

module.exports = {
    default: 'main',
    main: 'mongodb://localhost/main',
    admin: 'mongodb://localhost/admin',
};

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;

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;

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' 
});

---

是的，我需要多个DB连接。我看到了这个答案，但对我来说仍然不起作用。conn和conn2的示例看起来最好，但我不能将其分为两个文件。你能试着举一个例子吗？为你增加了一个工作例子。这是您所需要的吗？如果它对任何人都有帮助，仅供参考，请不要使用mongoose.model（'User'，Schema），就像您使用connect一样（不要使用mongoose.model）；使用connectionname.model，如示例TypeError中所示：conn.model不是一个函数，如果出现此错误，请不要使用

。然后使用
或
。在
createConnection
上捕获
，就像使用
connect
…@AeroWang>一样。在看到您的评论之前，我至少犹豫了30分钟，我们如何关闭这些连接并行？我得到错误
TypeError:client.s.dbCache[name]。emit不是函数