Knex 要求安装 sqlite3 但我正在使用 mysql 数据库

Question

我正在尝试查询我的本地 MySQL 数据库，但是当我使用 knex 时，它告诉我安装 sqlite3 的驱动程序，我不需要它，因为我的数据库是MySQL.

我尝试安装 sqlite3 的驱动程序只是为了看看它是否能解决我的问题，但它只是让其他与 sqlite3 相关的错误出现，所以我只是删除了 sqlite3 驱动程序。

我已经有MySQL的驱动了。下面是我的代码。

为什么会出现这个错误？据我所知，它不应该要求我提供 sqlite3 驱动程序，而只是要求我在 knex 配置中传递的 MySQL。

*** 我已经尝试使用驱动程序 mysql2 但没有任何改变...

const knex = require('knex');
require('dotenv').config();

const listUsers = async (req, res) => {

    console.log(process.env.DATABASE_PASSWORD);
    //res.send(process.env.DATABASE_USER);

    knex({
        client: 'mysql',
        connection: {
            host: process.env.DATABASE_HOST,
            user: process.env.DATABASE_USER,
            password: process.env.DATABASE_PASSWORD,
            database: process.env.DATABASE_NAME
        }
    })

    knex('users')
        .select('*')
        .then(mysqlres => res.send(mysqlres))
        .catch(mysqlerr => res.send(console.log(mysqlerr)))
}

module.exports = {
    listUsers
};

这是我的错误：


Knex: run
$ npm install sqlite3 --save
Cannot find module 'sqlite3'
Require stack:
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\dialects\sqlite3\index.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\knex.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\index.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\knex.js
- D:\coding\Studies\Moblex\backend-mysql\src\controllers\userController.js
- D:\coding\Studies\Moblex\backend-mysql\src\routes.js
- D:\coding\Studies\Moblex\backend-mysql\src\server.js
Error: Cannot find module 'sqlite3'
Require stack:
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\dialects\sqlite3\index.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\knex.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\index.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\knex.js
- D:\coding\Studies\Moblex\backend-mysql\src\controllers\userController.js
- D:\coding\Studies\Moblex\backend-mysql\src\routes.js
- D:\coding\Studies\Moblex\backend-mysql\src\server.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:965:15)
    at Function.Module._load (internal/modules/cjs/loader.js:841:27)
    at Module.require (internal/modules/cjs/loader.js:1025:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at Client_SQLite3._driver (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\dialects\sqlite3\index.js:36:12)    
    at Client_SQLite3.initializeDriver (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\client.js:232:26)
    at Client_SQLite3.Client (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\client.js:70:10)
    at new Client_SQLite3 (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\dialects\sqlite3\index.js:18:10)        
    at new Knex (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\knex.js:53:28)
    at Knex (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\knex.js:17:12)
(node:12648) UnhandledPromiseRejectionWarning: Error: Knex: run
$ npm install sqlite3 --save
Cannot find module 'sqlite3'
Require stack:
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\dialects\sqlite3\index.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\knex.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\index.js
- D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\knex.js
- D:\coding\Studies\Moblex\backend-mysql\src\controllers\userController.js
- D:\coding\Studies\Moblex\backend-mysql\src\routes.js
- D:\coding\Studies\Moblex\backend-mysql\src\server.js
    at Client_SQLite3.initializeDriver (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\client.js:236:13)
    at Client_SQLite3.Client (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\client.js:70:10)
    at new Client_SQLite3 (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\dialects\sqlite3\index.js:18:10)        
    at new Knex (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\knex.js:53:28)
    at Knex (D:\coding\Studies\Moblex\backend-mysql\node_modules\knex\lib\knex.js:17:12)
    at listUsers (D:\coding\Studies\Moblex\backend-mysql\src\controllers\userController.js:19:5)
    at Layer.handle [as handle_request] (D:\coding\Studies\Moblex\backend-mysql\node_modules\express\lib\router\layer.js:95:5)  
    at next (D:\coding\Studies\Moblex\backend-mysql\node_modules\express\lib\router\route.js:137:13)
    at Route.dispatch (D:\coding\Studies\Moblex\backend-mysql\node_modules\express\lib\router\route.js:112:3)
    at Layer.handle [as handle_request] (D:\coding\Studies\Moblex\backend-mysql\node_modules\express\lib\router\layer.js:95:5)  
(node:12648) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12648) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Answer 1

伙计们，我只是想在应用配置时我需要创建一个新的 Knex 实例，这将起作用！而它之前要求驱动器sqlite3的原因是因为knex使用sqlite3模型。因此，因为我没有使用自己的配置创建 Knex 的新实例，所以它使用的是默认设置。

所以这是我的解决方案代码！

const listUsers = async (req, res) => {


   const knexapp = knex({
        client: 'mysql2',
        connection: {
            database: process.env.DATABASE_NAME,
            user: process.env.DATABASE_USER,
            password: process.env.DATABASE_PASSWORD
        },
        pool: {
            min: 2,
            max: 10
        },
        migrations: {
            tableName: 'knex_migrations'
        }
    })

    knexapp('users').select('*').then(resmsql => res.send(resmsql)).catch(err => res.send(err))

Knex 要求安装 sqlite3 但我正在使用 mysql 数据库

Knex asking for install sqlite3 but I'm using mysql database

javascript

node.js

knex.js

node-sqlite3