Question about array read using protocol 3.0 implementation in C#

Carlos Guzman Alvarez <carlosga@telefonica.net> writes:

I'm trying to read an array, using binary format code and my own
implementation of the 3.0 protocol in C#, at this moment i have made
test with arrays of int2 and float4, seems that the server sends a
header of 24 bytes before the data in the buffer, i need to know what
these 24 bytes mean :),

Use the source Luke ... array_send, in backend/utils/adt/arrayfuncs.c,
does this:

/* Send the array header information */
pq_sendint(&buf, ndim, 4);
pq_sendint(&buf, v->flags, 4);
pq_sendint(&buf, element_type, sizeof(Oid));
for (i = 0; i < ndim; i++)
{
pq_sendint(&buf, ARR_DIMS(v)[i], 4);
pq_sendint(&buf, ARR_LBOUND(v)[i], 4);
}

I believe flags is always 0 at the moment; it might be a good idea
to punt if you see a nonzero there.

regards, tom lane

Hello:

Use the source Luke ... array_send, in backend/utils/adt/arrayfuncs.c,
does this:

/* Send the array header information */
pq_sendint(&buf, ndim, 4);
pq_sendint(&buf, v->flags, 4);
pq_sendint(&buf, element_type, sizeof(Oid));
for (i = 0; i < ndim; i++)
{
pq_sendint(&buf, ARR_DIMS(v)[i], 4);
pq_sendint(&buf, ARR_LBOUND(v)[i], 4);
}

Thanks very much.

I believe flags is always 0 at the moment; it might be a good idea
to punt if you see a nonzero there.

I have added code for check it.

--
Best regards

Carlos Guzma'n A'lvarez
Vigo-Spain

- Miembro del Proyecto FirebirdSQL.
- Miembro honorario de la Fundacio'n FirebirdSQL.

http://www.firebirdsql.org

Hello:

Thanks another wuestion in this case about oidvector i'm reviewing
oidvectorsend() at backend/utils/adt/oid.c and seems that for this
datatype the server sends only array data, i'm rigth ??, i think yes but
i want to be sure ;) ( and i think the same can be applied to int2vector
?? )

--
Best regards

Carlos Guzm�n �lvarez
Vigo-Spain

Carlos Guzman Alvarez <carlosga@telefonica.net> writes:

Thanks another wuestion in this case about oidvector i'm reviewing
oidvectorsend() at backend/utils/adt/oid.c and seems that for this
datatype the server sends only array data, i'm rigth ??, i think yes but
i want to be sure ;) ( and i think the same can be applied to int2vector
?? )

Right, the fixed-length array types are a whole 'nother critter.

regards, tom lane

Hello:

Right, the fixed-length array types are a whole 'nother critter.

Thanks

--
Best regards

Carlos Guzm�n �lvarez
Vigo-Spain