PHP OOPs tutorial in Hindi # MySQL with PHP using class and OOP

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best php course on yt

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Sir project kya aane vala hai?

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Fatal error: Uncaught PDOException: SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected in C:\xampp\htdocs\tut\php-mysql\oop\student.php:12 Stack trace: #0 C:\xampp\htdocs\tut\php-mysql\oop\student.php(12): PDOStatement->execute() #1 C:\xampp\htdocs\tut\php-mysql\oop\student.php(20): Student->getData() #2 {main} thrown in C:\xampp\htdocs\tut\php-mysql\oop\student.php on line 12 sir how to solve this errors