Re: PQfformat() and Composite Formatted Results

Volkan YAZICI <yazicivo@ttnet.net.tr> writes:
> PQfformat() returns the format code indicating the format of the
> given column. But, AFAIC, it's not possible to gather composite
> formatted results using current query execution functions. They
> only permit to specify the return format of the whole result
> struct. (Like all of them will be binary or text.) Therefore, there
> doesn't remain any usage difference between PQbinaryTuples() and
> PQfformat().

> Please fix me if I'm wrong. Is this remained as a TODO for the
> protocol or I missed something totally?

It's not a protocol restriction, it's a libpq restriction made in the
name of keeping the API from getting too unwieldy.  We could add more
entry points with different parameter lists to address this.  I have
a feeling that refactoring the API of the query functions entirely
might be a better idea, though.
        regards, tom lane