未处理的拒绝SequelizeDatabaseError:未选择数据库

时间:2019-04-30 21:40:09

标签: mysql node.js express sequelize.js dotenv

我正在使用MySQL在Express.js应用程序中使用sequelize。

所有数据库凭据都存储在.env文件中,并且是正确的:

DATABASE_NAME= mydb
DATABASE_USERNAME= root
DATABASE_PASSWORD= pass
DATABASE_HOST= localhost
DATABASE_PORT= 3306

database.js文件:

require('dotenv').config();
const Sequelize = require('sequelize');

module.exports = new Sequelize(
    process.env.DATABAST_NAME,
    process.env.DATABASE_USERNAME,
    process.env.DATABASE_PASSWORD,
    {
        port: process.env.DATABASE_PORT,
        host: process.env.DATABASE_HOST,
        dialect: 'mysql'
    }
);

在用户模型中:

    const Sequelize = require('sequelize');
    const db = require('../config/database');

    module.exports = db.define('user', {
        username: {
            type: Sequelize.STRING,
            unique: true,
            primaryKey: true
        },
        email: {
            type: Sequelize.STRING,
            unique: true
        },
        password: {
            type: Sequelize.STRING
        },
    }, {
        freezeTableName: true,
        timestamps: false
    });

  user.findAll().then(data=>{
        console.log(data)
   });

数据库“ mydb”只有一个表“用户”,随着应用程序启动,出现错误:

Executing (default): SELECT `username`, `email`, `password` FROM `user` AS `user`;
Unhandled rejection SequelizeDatabaseError: No database selected
    at Query.formatError (C:\Users\me\WebstormProjects\Backend\node_modules\sequelize\lib\dialects\mysql\query.js:241:16)
    at Query.handler [as onResult] (C:\Users\me\WebstormProjects\Backend\node_modules\sequelize\lib\dialects\mysql\query.js:48:23)
    at Query.execute (C:\Users\me\WebstormProjects\Backend\node_modules\mysql2\lib\commands\command.js:30:14)
    at Connection.handlePacket (C:\Users\me\WebstormProjects\Backend\node_modules\mysql2\lib\connection.js:449:32)
    at PacketParser.Connection.packetParser.p [as onPacket] (C:\Users\me\WebstormProjects\Backend\node_modules\mysql2\lib\connection.js:72:12)
    at PacketParser.executeStart (C:\Users\me\WebstormProjects\Backend\node_modules\mysql2\lib\packet_parser.js:75:16)
    at Socket.Connection.stream.on.data (C:\Users\me\WebstormProjects\Backend\node_modules\mysql2\lib\connection.js:79:25)
    at Socket.emit (events.js:189:13)
    at addChunk (_stream_readable.js:284:12)
    at readableAddChunk (_stream_readable.js:265:11)
    at Socket.Readable.push (_stream_readable.js:220:10)
    at TCP.onStreamRead [as onread] (internal/stream_base_commons.js:94:17)
  1. 我尝试使用以下代码测试.env文件,并且一切都可读:

    var config = require('dotenv')。config(); console.log(config)

  2. 我试图在db.defind()中的'user'前面添加数据库名称,但遇到了同样的问题。

请,如果您有任何建议,请告诉我。

1 个答案:

答案 0 :(得分:-1)

  1. 使用以下命令从 dotenv 安装 npm 包:
npm install dotenv
  1. 通过添加以下几行,在位于“src”文件夹内的 dotenv 文件中要求 main.ts
import * as dotenv from "dotenv";
dotenv.config();
  1. 再次运行您的项目。