Check if Django is able to connect with given parameters or return an error message, instead of causing an internal server error (500)

Question

I'm trying to build dynamic connections to databases. This because I just now and then have to query them to get some data. The sources change over time, so I'm not in favor of adding them to settings.

Currently I have the following code:

    DBTYPE = (
        ('postgres', ('PostgreSQL')),
        ('mysql', ('MySQL')),
        ('mysql', ('MariaDB')),
        ('oracle', ('Oracle')),
        ('mssql', ('MSSQL')),
        ('sqlite', ('SQLite')),
    )
    URLTEMPLATES = (
        ('postgres', ('postgres://{USER}:{PASSWORD}@{HOST}:{PORT}/{NAME}')),
        ('mysql', ('mysql://{USER}:{PASSWORD}@{HOST}:{PORT}/{NAME}')),
        ('oracle', ('oracle://{USER}:{PASSWORD}@{HOST}:{PORT}/{NAME}')),
        ('mssql', ('mssql://{USER}:{PASSWORD}@{HOST}:{PORT}/{NAME}')),
        ('sqlite', ('sqlite:///{HOST}')),
    )
    dburl = [item for item in URLTEMPLATES if item[0] == self.engine]
    self.db_url = dburl.format(**template_values)
    dbsetting = dj_database_url.parse(self.db_url,conn_max_age=600,conn_health_checks=True,)
    


     database_id = self.name 
                newDatabase = {}
                for conn in connections.all():
                    print(conn)
                try:
                    newDatabase["id"] = database_id
                    newDatabase['ENGINE'] = dbsetting['ENGINE']
                    newDatabase['NAME'] = dbsetting['NAME']
                    newDatabase['USER'] = dbsetting['USER']
                    newDatabase['PASSWORD'] = dbsetting['PASSWORD']
                    newDatabase['HOST'] = dbsetting['HOST']
                    newDatabase['PORT'] = dbsetting['PORT']
                    newDatabase['ATOMIC_REQUESTS'] = True
                    newDatabase['TIME_ZONE'] = 'Europe/Paris'
                    newDatabase['CONN_HEALTH_CHECKS'] = False
                    newDatabase['CONN_MAX_AGE'] = 600
                    newDatabase['OPTIONS'] = {}
                    newDatabase['AUTOCOMMIT'] = False
                    connections.databases[database_id] = newDatabase
    
                   cursor = connections[database_id].cursor()
                   cursor.close()

What I would like to achieve is, that when Django is unable to connect, it just responds with a message that connection could not be established.

Now I get, for example:

Exception Type: OperationalError
Exception Value:    
(1045, "Access denied for user 'test'@'localhost' (using password: YES)")

In those case I would just like to respond with an error that the connection could not be established.

How could I go about this?