Update multiple records and fields on the List page

Yes, read this article for instance:

https://www.geeksforgeeks.org/sql-update-statement/
Google search phrase: sql update statement

Hi Sergey. Thanks
It works almost. I want for the FinalExportBy the logged in user. How do I state that??
global $dal;
while ( $data = $button->getNextSelectedRecord() ) {

// set ReportsTo field to 'Bob Smith'

$sql = "Update VoucherLines SET FinalExportYN='1',DateFinalExport=CURDATE(),FinalExportBy='1' where VoucherLinesID=".$data["VoucherLinesID"];
CustomQuery($sql);

}
$result["txt"] = "Records were updated.";

Check this:

https://xlinesoft.com/phprunner/docs/secapi_get_user_name.htm

global $dal;
while ( $data = $button->getNextSelectedRecord() ) {

// set ReportsTo field to 'Bob Smith'

$sql = "Update VoucherLines SET FinalExportYN='1',DateFinalExport=CURDATE(),FinalExportBy='getUserName()' where VoucherLinesID=".$data["VoucherLinesID"];
CustomQuery($sql);

}
$result["txt"] = "Records were updated.";
It is about FinalExportBy: I also tried Security:: getUserName and lots of other possibilities. No success.
How do I get the username in the field FinalExportBy?