[TYPO3] Making querystrings SQL safe?

[Bob]

Hi,

I'm gradually getting my head around Typoscript and developing my first 
sites, but have a quick question that's stumping me at the moment...

If I want to use a parameter from a querystring (e.g. "GPvar:day") in a 
"select.andWhere", what the quickest / easiest way to make it "SQL safe" 
(e.g. to handle any apostrophes)?

Currently, my code is something like the following:

   table = pages
   select.andWhere.data = GPvar:day
   select.andWhere.wrap = title LIKE '|'

However, "GPvar:day" could contain apostrophes which would cause 
undesirable behaviour...

Thanks,

Bob