Your question isn't clear

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Why would you want to replace undef values (which correspond to NULL-values in the database) with the string "null" anyway? That can change the datatype of the column (since numeric columns can also contain NULL values, which you change to a text datatype).

To answer your question, if you use

$sth->bind_columns(\$var1, \$var2, \$var3);
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@list_of_refs_to_vars_to_bind = (\$var1, \$var2, \$var3);
$sth->bind_columns(@list_of_refs_to_vars_to_bind);
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map { $$_ = "null" if (!defined $$_); } @list_of_refs_to_vars_to_bind;
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Hi, Thanks for the Map idea, I'm new to perl (but not other similar languages).
Can someone explain why the example:

map { $$_ = "null" if (!defined $$_); } @list_of_refs_to_vars_to_bind;

...uses $$_ when I would expect it to use $_ - i've googled round and round but haven't found an explanation yet.

many thanks
jonathan

A decent tut on reference/dereference -- such as those found in Tutorials right here in the Monastery -- should make the answer clear.

If you didn't program your executable by toggling in binary, it wasn't really programming!