i think so, im guessing that the syntax is.
select all from the table oracle vault where the email matches the email submitted (.$email.) then set the corresponding placeholders of field1 and field2 (which are in the database)
I would then need to set someinputs on the receiving page using
<input type="hidden" value="[[+my.field1]]">
then FormItRetriever can access the fields?
and im guessing that it should be
$sql = "SELECT * FROM `oracle_vault` WHERE email = '".$email."'";
$stmt= $modx->query($sql);
if ($stmt) {
$row = $stmt->fetch(PDO_FETCH_ASSOC);
$modx->setPlaceholders(array(
'field1' => $row['field1'],
'field2' => $row['field2']
),'my.');
}