How to deal with the error message of "CDbCommand failed to execute the SQL statement FOREIGN KEY" in yii1.1 - yii

Question

I am encounted an error of "CDbCommand failed to execute the SQL statement FOREIGN KEY" when I wanted to delete a record on my admin page. I know it is saying the record has a constraint through foreign key. But how to deal with this error message? For example, just warn "you can not delete this record...".
CDbCommand failed to execute the SQL statement: SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (yxbeauty.tbl_project_user_role, CONSTRAINT tbl_project_user_role_ibfk_1 FOREIGN KEY (project_id) REFERENCES tbl_project (id))

Answer 1

I tried to use the try{...} and catch{...} to resolve above program, my code is as below.
public function actionDelete($id)
{
try{
if(Yii::app()->request->isPostRequest)
{
// we only allow deletion via POST request
$this->loadModel($id)->delete();
// if AJAX request (triggered by deletion via admin grid view), we should not
redirect the browser
if(!isset($_GET['ajax']))
$this->redirect(isset($_POST['returnUrl']) ? $_POST['returnUrl'] :
array('admin'));
}
}
catch (Exception $e) {
echo 'warning: ' . $e->getMessage();
}
}
But, I could not echo the warning message. Can you give me your advise?