带有 Sequelizejs 的 Nodejs，每个模型使用单独的文件

问题描述

这是一个令人尴尬的初学者问题，但我只是想解决我对 Sequelizejs 的担忧.我想将每个模型拆分成自己的文件，以保持我的源代码组织.为了做到这一点，我需要 require("sequelize') 和 var sequelize = new Sequelize('DB-Name', 'DB-User', 'DB-Password'); 在每个文件的开头.

This is an embarrassingly beginner question, but I just want to settle my worries about Sequelizejs. I want to split out each model into its own file to keep my source organized. In order to do that I need to require("sequelize') and var sequelize = new Sequelize('DB-Name', 'DB-User', 'DB-Password'); at the start of each file.

我的问题是，这会为每个模型创建一个到数据库的新连接，还是会继续重复使用相同的连接?我应该放弃每个文件一个模型"的整个概念而只创建一个主 Models.js 文件吗?

My question is, will that create a new connection to the database per model, or will it just keep re-using the same connection? Should I abandon the whole concept of "one model per file" and just create a master Models.js file?

我对 Node 非常陌生，并且仍在习惯它的约定.感谢您的帮助！

I am very new to Node and am still getting used to its conventions. Thanks for the help!

推荐答案

每个模型都定义为自己的模块，您可以导出该模块:

Every model is defined as its own module, which you export:

module.exports = function(sequelize, DataTypes){
    return sequelize.define('Brand', {
        name: {
            type: DataTypes.STRING,
            unique: true,
            allowNull: false },
        description: {
            type: DataTypes.TEXT,
            allowNull: false },
        status: {
            type: DataTypes.INTEGER,
            unique: false,
            allowNull: true }
    })
};

然后在初始化 Sequelize 时简单地导入模块(在这里可以导入很多模型):

Then simply import the module when you initialize Sequelize (and you can import many models here):

var Sequelize = require("sequelize");
var config = require("../../config/config.js");
var sequelize = new Sequelize(config.database, config.username, config.password,
    { dialect: config.dialect, host: config.host, port: config.port,
      omitNull: true, logging: false });
var Brand = require("./Brand").Brand;

您可以在 http://nodejs.org/api/modules.htm 但上面的例子应该会让你开始.

You can read up more on modules at http://nodejs.org/api/modules.htm but the example above should get you started.

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