使用egg.js和egg-sequelize连接mysql

1.通过 egg-init 初始化一个项目:

egg-init --type=simple --dir=sequelize-project
cd sequelize-project
npm i

2.安装并配置 egg-sequelize 插件（它会辅助我们将定义好的 Model 对象加载到 app 和 ctx 上）和 mysql2模块：

3.

• 在 config/plugin.js 中引入 egg-sequelize 插件

exports.sequelize = {
  enable: true,
  package: 'egg-sequelize',
};

• 在 配置数据库信息（在 config/config.default.js 中添加 sequelize 配置）

/* eslint valid-jsdoc: "off" */

'use strict';

/**
 * @param {Egg.EggAppInfo} appInfo app info
 */
module.exports = appInfo => {
  /**
   * built-in config
   * @type {Egg.EggAppConfig}
   **/
  const config = {};

  // use for cookie sign key, should change to your own and keep security
  config.keys = appInfo.name + '_1553528793275_7075';

  // add your middleware config here
  config.middleware = [];
  config.sequelize = {
    dialect: 'mysql',
    host: '127.0.0.1',
    port: 3306,
    database: 'egg_test',         //数据库民
    username: 'root',             //数据库的用户名
    password: 'root'                   //
} 
  // add your user config here
  const userConfig = {
    // myAppName: 'egg',
  };

  return {
    ...config,
    ...userConfig,
  };
};

　　

4.使用model 连接数据表

Model/user.js

'use strict';
 
module.exports = app => {
    const { STRING, INTEGER } = app.Sequelize;

    const User = app.model.define('user',
        {
            userid: { type: INTEGER, primaryKey: true, autoIncrement: true },
            username: STRING(50),
            sex: STRING(4),
            userpass:STRING(32)
        },
        {
            freezeTableName: true, // Model 对应的表名将与model名相同
            timestamps: false,
        }
    );
 
    return User;
};

　　5.调用model操作数据库

controller/user.js

'use strict';

const Controller = require('egg').Controller;

class HomeController extends Controller {
  async index() {
    const { ctx } = this;
    ctx.body = 'hi, egg';
  }
}

module.exports = HomeController;

　　6.创建数据库

ALTER TABLE `user`
MODIFY COLUMN `userid`  int(11) NOT NULL DEFAULT '' FIRST ,
MODIFY COLUMN `sex`  char(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '' AFTER `username`;

　　

7.添加路由

'use strict';

/**
 * @param {Egg.Application} app - egg application
 */
module.exports = app => {
  const { router, controller } = app;
  router.get('/', controller.home.index);
  router.get('/user', controller.user.index);
};