出现错误：请手动安装 mysql2 软件包，即使已安装

Question

这是我的index.js和config.json文件：

const { Sequelize } = require('sequelize');
const env = process.env.NODE_ENV || 'development';
const config = require('../config/config.json')[env];

const sequelize = new Sequelize({
  dialect: config.dialect,
  storage: config.storage,
  dialectModule: require('mysql2')
});

sequelize.authenticate()
  .then(() => {
      console.log('Connection has been established successfully.');
  })
  .catch(err => {
      console.error('Unable to connect to the database:', err);
  });

module.exports = sequelize;

config.json：

{
  "development": {
    "dialect": "sqlite",
    "storage": "./database.sqlite3",
    "migrations-path": "./migrations" 
  },
  "test": {
    "dialect": "sqlite",
    "storage": "./database_test.sqlite3",
    "migrations-path": "./migrations"
  },
  "production": {
    "dialect": "sqlite",
    "storage": "./database.sqlite3",
    "migrations-path": "./migrations"
  }
}

运行后出错

npx sequelize-cli db:migrate

:

已加载配置文件“config/config.json”。
使用环境“开发”。

错误：请手动安装 mysql2 软件包

我尝试全局安装 mysql2 并使用此命令：

npx sequelize-cli db:migrate --env development

，但没有任何效果

Answer 1

mysql2 应该安装在您的项目中：

npm install mysql2 --save

那么，

dialect: 'mysql',

更改此行并再次运行迁移命令。

npx sequelize-cli db:migrate --env development