connect_info
We can't cache very effectively without bind variables, so force the "disable_sth_caching" setting to be
turned on when the connect info is set.
_prep_for_execute
Manually subs in the values for the usual "?" placeholders.
interpolate_unquoted
This method is called by "_prep_for_execute" for every column in order to determine if its value should
be quoted or not. The arguments are the current column data type and the actual bind value. The return
value is interpreted as: true - do not quote, false - do quote. You should override this in you
Storage::DBI::<database> subclass, if your RDBMS does not like quotes around certain datatypes (e.g.
Sybase and integer columns). The default method returns false, except for integer datatypes paired with
values containing nothing but digits.
WARNING!!!
Always validate that the bind-value is valid for the current datatype.
Otherwise you may very well open the door to SQL injection attacks.
_prep_interpolated_value
Given a datatype and the value to be inserted directly into a SQL query, returns the necessary string to
represent that value (by e.g. adding a '$' sign)