我正在尝试对本地 MySQL 数据库进行查询,但是当我使用 knex 时,它要求我安装 sqlite3 的驱动程序,但我不需要,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可以解决我的问题,但它只是导致与sqlite3相关的其他错误出现,所以我只是删除了sqlite3驱动程序。
我已经有了MySQL的驱动。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,而只要求我提供 MySQL,因为我传递了 knex 的配置。
*** 我已经尝试过使用驱动程序 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.
伙计们,我想当我应用配置时我需要创建一个新的 Knex 实例,这样就可以了!之前之所以要求驱动器sqlite3,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配置。
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))
我在打字稿项目中遇到类似的 knex 问题。我已经使用客户端“mqsql”创建了一个 knex 实例,但它要求使用其他方言。谁能帮帮我吗?
ERROR in ./node_modules/knex/lib/dialects/sqlite3/index.js 42:11-29 Module not found: Error: Can't resolve 'sqlite3' in './node_modules/knex/lib/dialects/sqlite3'