You've stringified all three of your arguments which isn't what you want to do. A DBI handle is an object which is (usually) implemented as a reference to a data structure such as a hash. When you pass it through double quotes you're breaking that reference (hand waving a bit here; see perlobj for more details) so when you try and call methods upon it you're trying to call methods on a string value (hence your error).

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re^5: $dbh could not be passed to function unless another variable is also passed by Fletch
in thread $dbh could not be passed to function unless another variable is also passed by tukusejssirs

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