Somone said:

This can be very difficult to get right.

The whole thing seems like a tremendous can of worms.

I think what I'm going to do is allow the user to specify additional functions, such as

    use EZDBI 'Replace';
[download]

This will create a Replace function which can be used just like the existing Insert and Delete functions, if the database supports it. If not, the Replace function will generate a syntax error, as if you had done $dbh->prepare("REPLACE ...");

Trying to emulate REPLACE on databases that don't support that natively seems to be too perilous. The user is still free to write eval { Insert ... } or Update... if they want to.

--
Mark Dominus
Perl Paraphernalia