> I have a table like this
> 
> CREATE TABLE foo (bar TEXT NOT NULL DEFAULT 'default_value');
> 
> and I'd like to create a reusable statement to do inserts into foo, like this:
> 
> INSERT INTO foo (bar) VALUES (?);
> 
> Sometimes I have values for bar and sometimes I don't and want the
> default. Is there any way to indicate to the statement that I want the
> bound parameter to be "nothing" therefore giving me the default value?
> If I bind that column to NULL I get a constraint error.

Could you simply create two separate prepared statements (one which sets 
bar and one which doesn't), then use the appropriate one, depending on 
whether you know the value of bar?  Perhaps not as elegant as reusing 
one statement for everything, but it should work easily enough.

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