ERROR: Please install mysql2 package manually

问题

When using the sequalize db:migrate command I am getting the following error. Looking at some of the previous comments on similar issues people said it is a dependency issue but whenever I run

npm install mysql2

npm install -g mysql2

I get the same error.

larry@DESKTOP-NSSNPRR:/mnt/c/Users/larry/Desktop/node/AAF-NodeJS$
sequelize db:migrate

Sequelize CLI [Node: 10.1.0, CLI: 4.0.0, ORM: 4.37.10]

(node:2241) ExperimentalWarning: The fs.promises API is experimental
Loaded configuration file "db/config/database.json".
Using environment "development".

ERROR: Please install mysql2 package manually

Here is my package.json like some of you have asked for.

{
  "name": "aaf-website-node",
  "version": "0.0.1",
  "description": "Nodejs implementation of the achieve anything website",
  "main": "app.js",
  "scripts": {
    "start": "node bin/www",
    "dev": "node node_modules/nodemon/bin/nodemon.js bin/www",
    "test": "jasmine",
    "console": "node console.js"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/AchieveGirl/AAF-NodeJS.git"
  },
  "keywords": [
    "nodejs",
    "express"
  ],
  "author": "Larry Cherry",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/AchieveGirl/AAF-NodeJS/issues"
  },
  "homepage": "https://github.com/AchieveGirl/AAF-NodeJS/blob/master/README.md",
  "dependencies": {
    "body-parser": "^1.18.2",
    "bootstrap": "^4.0.0",
    "compression": "^1.7.2",
    "cookie-parser": "^1.4.3",
    "dotenv": "^5.0.1",
    "ejs": "^2.5.7",
    "eslint": "^4.19.1",
    "express": "^4.16.3",
    "express-ejs-layouts": "^2.3.1",
    "express-minify": "^1.0.0",
    "express-minify-html": "^0.12.0",
    "jquery": "^3.3.1",
    "lodash": "^4.17.5",
    "morgan": "^1.9.0",
    "mysql2": "^1.5.3",
    "node-fetch": "^2.1.2",
    "node-minify": "^2.4.1",
    "popper.js": "^1.14.3",
    "sequelize": "^4.37.10",
    "sequelize-cli": "^4.0.0",
    "serve-favicon": "^2.4.5",
    "webpack": "^4.1.1",
    "webpack-cli": "^2.0.12"
  },
  "devDependencies": {
    "nodemon": "^1.17.2",
    "pryjs": "^1.0.3"
  }
}

回答1:

So I finally figured out the bug. The issue appears to come from when you are calling the migration from global install of sequelize-cli instead of the locally installed version of sequelize in my project. All I had to do was call the script form the node modules folder and it worked perfectly. I was calling the command this way sequelize db:migrate when I needed to call the local installed package this way node_modules/.bin/sequelize db:migrate

回答2:

This one worked for me

npm install mysql2 --save

回答3:

i installed mysql2 package globally out of my project folder using :

npm install mysql2 -g

回答4:

The reason that you getting an error message to prompt you to install the mysql2 module is because of the db:migrate command is relied on the mysql2 but as an optionalDependencies, so you have to install the mysql2 module manually

回答5:

List your global npm packages

npm list -g --depth 0
Uninstall sequelize

npm uninstall -g sequelize
Install sequelize in project scope

npm install --save sequelize

回答6:

I was unable to call a specific instance of sequelize (local vs global), so I uninstalled the global sequelize that I had added through yarn yarn global remove sequelize and then added it locally to my project yarn add sequelize.

npm equivalents would be npm -g uninstall sequelize and npm install sequelize.

Note in case anyone is going through the same, I did have mysql2 installed.

回答7:

Since version 5.2.0 nodejs comes alongside with an utility called npx, which is destined to be used as the "package runner", as it first look packages inside your node_modules you should not have any more troubles running commands with it.

NPM now should be used as a dependency manager instead of a command runner.

You can check differences of both here

回答8:

I solved it by running :-

yarn add mysql2

回答9:

Did you try saving the config.json file before to run sequelize db:migrate? In my case that was the i

来源：https://stackoverflow.com/questions/50614067/error-please-install-mysql2-package-manually

标签

node.js

sequelize.js