Re: Two seperate problems with libpq - arrays and bytea edit

Teunis Peters <teunis(at)wintersgift(dot)com> writes:
> I'm trying to figure out how to read from and write to bytea values and
> array (specifically "text[2][]" for a key:value 'dictionary') and
> cannot figure it out.

Well, since you are asking for binary output format from PQexecParams,
the bytea result is going to just be raw binary data: you should not be
trying to apply PQunescapeBytea to it. I don't know the notation you
are using well enough to tell what's wrong with your second variant.

> Arrays I'm completely lost - I haven't a clue what the format would be.

Looking at array_send, the binary wire format is

number of dimensions (int4)
flags (int4)
element type id (Oid)
for each dimension:
dimension length (int4)
dimension lower subscript bound (int4)
for each array element:
element value, in the appropriate format

The "flags" are currently always 0, and I would recommend punting if
you see something else, since something else would very possibly
indicate a change in the wire format.

Don't forget that the wire format for integers is network byte order
(ie, big-endian).

regards, tom lane