Following the php toolbox, it shows that the database is connected, but it cannot connect to the MYSQL database.
The call displays "Execution failed, please refer to: No database selected"
Don’t forget to add database $dbname when using mysqli_connect(), or use mysqli_select_db() to select a database. Otherwise, you cannot connect to a specific database.
No database selected, which means no database is selected, select it and then import it
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Don’t forget to add database $dbname when using mysqli_connect(), or use mysqli_select_db() to select a database. Otherwise, you cannot connect to a specific database.
No database selected, which means no database is selected, select it and then import it