>my $ref = $sth->fetchrow_arrayref();
>foreach my $row (@$ref) {
may be you want use just like this
while (my $row = $sth->fetchrow_arrayref() )
OR you can use 'fetchall_arrayref' instead of 'fetchrow_arrayref'.
'fetchrow_arrayref()' fetches the next row of data and returns a reference
to an array holding the field values.
'fetchall_arrayref()' returns a reference to an array that contains one
reference per row.
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