Symfony get className object from String class declaration - doctrine-orm

Question

I have this code that returns column names of the className declared in the 2nd line :
public function listColumns(EntityManagerInterface $em ) {
$class = $em->getClassMetadata(Assure::class);
$fields = [];
if (!empty($class->discriminatorColumn)) {
$fields[] = $class->discriminatorColumn['name'];
}
$fields = array_merge($class->getColumnNames(), $fields);
foreach ($fields as $index => $field) {
if ($class->isInheritedField($field)) {
unset($fields[$index]);
}
}
foreach ($class->getAssociationMappings() as $name => $relation) {
if (!$class->isInheritedAssociation($name)){
foreach ($relation['joinColumns'] as $joinColumn) {
$fields[] = $joinColumn['name'];
}
}
}
return $fields;
}
I am trying to make this function parametrable so I can give it every time which table/className I am trying to get its columns

Answer 1

This is a possible solution to do what I want (extracting table column names ) differently :
public function listColumns2(EntityManagerInterface $em ) {
$conn = $this->getEntityManager()->getConnection();
$sql = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME =
N'Assure' ";
$stmt = $conn->prepare($sql);
$stmt->execute();
return $stmt->fetchAllAssociative();
}