When a non-zero-length array is returned by getPropertyInfo, each element is a DriverPropertyInfo object representing a connection URL attribute that has not already been specified. Only those that make sense in the current context are returned.
This DriverPropertyInfo object contains:
If an attribute has a default value, this is set in the value field of DriverPropertyInfo, even if the attribute has not been set in the connection URL or the Properties object. If the attribute does not have a default value and it is not set in the URL or the Properties object, its value will be null.
Several fields in a DriverPropertyInfo object are allowed to be null.