The problem in your code is that $quantity appears to be undecleared when you first use it. strict has surely told you already.
If you want do do something on every element of a list but you only have the code to do it on a scalar, use map:
@quantity = map $dbh->quote($_) , @quantity.
And unrelated but important: check the return value of do() in order to notice errors. Forget these words if you have RaiseError/PrintError enabled.
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