如何通过 package.json 中的脚本运行应用程序？

Question

I have a script like below in my package.json:

"start:dev": "nest start MYSQL_PORT=3306 MYSQL_HOST=localhost MYSQL_USERNAME=root MYSQL_DATABASE=testdb MYSQL_PASSWORD=",

why, when i run npm run start:dev my app is crashed with this error:

[Nest] 2264   - 02.01.2021, 19:01:10   [TypeOrmModule] Unable to connect to the database. Retrying (1)... +120ms
Error: ER_ACCESS_DENIED_ERROR: Access denied for user ''@'localhost' (using password: NO)

I have a databse o Xaamp without using password ,

my typeorm config to db:

 type: 'mysql',
 host: process.env.MYSQL_HOST,
 port: process.env.MYSQL_PORT ? +process.env.MYSQL_PORT : 3306,
 username: process.env.MYSQL_USERNAME,
 password: process.env.MYSQL_PASSWORD || '',
 database: process.env.MYSQL_DATABASE,

thanks for any helps

Answer 1

Since you are using Windows, try moving the environment variables before the nest start command and add SET before each environment variable.

"start:dev": "SET MYSQL_PORT=3306 && SET MYSQL_HOST=localhost && SET MYSQL_USERNAME=root && SET MYSQL_DATABASE=testdb && SET MYSQL_PASSWORD= && nest start",