[Zope] Uppercasing a string in a ZSQL method?

[Scott Anderson]

I've tried the following to change a string to upper case in a ZSQL
method:

<dtml-sqlvar sNewAcctNo type=string upper> (doesn't work; sqlvar doesn't
define 'upper')

<dtml-let sNewAcctNo="_.upper(sNewAcctNo)"> (doesn't work;
exceptions.AttributeError)

<dtml-let sNewAcctNo="string.upper(sNewAcctNo)">  (doesn't work;
exceptions.NameError)

<dtml-let sNewAcctNo="upper(sNewAcctNo)">  (doesn't work;
exceptions.NameError)


What am I missing?

Thanks in advance,
-scott