> 
> You probably should define your domain like this:
> 
>    CREATE DOMAIN myvarchar varchar(42);
> 

That's what I thought, so it won't do what I want. I need to be able to set the 
length at the time of declaration.

So suppose I wanted to implement myvarchar in C. In my _in function, how do I 
know how big my column declaration is? Eg if someone tries to insert 50 
characters into my 42 character field, how do I get the declared length and 
then tell postgres that the data to be inserted is too big?
 
Thanks

James



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