Again: [GENERAL] Extending SQL with a C function

Hi,

I still haven't found it out, so here's my question again:

> how can I write a SQL extention in C, which works with "unusual" data
> types?
>
> I've managed to write a c function, which accepts int4 as input parameter
> and has got int4 as output parameter.
>
> My problem now is, that I want to use a char(10) as input parameter, since
> the input for that function is a colum, which is a char(10) type.
> How do I do this?
>
> (In the manuals, it is said, one should create an own data type in C - I've
> already done this, called it "char10", but of course, I cannot use this
> data type in SQL...)
>
Thank you very much
  Christoph
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