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     "SELECT name,age FROM ?" # wrong will probably fail.

With most drivers, placeholders can't be used for any element of a sta
+tement that would prevent the database server from validating the sta
+tement and creating a query execution plan for it.

sub get_table_list ($) {
    my $log = shift;
...
    print"\n\n";
        $dbobject->disconnect;
}