This method is supported by sql server too (at least the version of the PDO driver 5.7.1)
Example:
array(8) {
["flags"]=>
int(0)
["sqlsrv:decl_type"]=>
string(12) "int identity"
["native_type"]=>
string(6) "string"
["table"]=>
string(0) ""
["pdo_type"]=>
int(2)
["name"]=>
string(8) "IdCompra"
["len"]=>
int(10)
["precision"]=>
int(0)
}