Help! exception handling

Hello Friends
    
I have a problem I do not understand how to solve, need to  capture the error code ($ error-> getCode ()) and put on an equal setFlash  website that I use to set whether a save operation was deleted or modified  successfully or not.
    
The issue is that when there is an exception for an  inconsistency of BD (Error 2300) I can put a setFlash that says "can not  be deleted because the registration is being used by this table" or  something.
  
If I can lend a hand to address this.

I tried to use its own error handler class as follows:
class MyExceptionHandler extends ErrorHandler{
    public static function handle($error) {
        

        echo $error->getCode();
        
    }
}

Thanks.
  
I tried to use its own error handler class as follows:
      

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