From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Akbar Mokhtarani <akbarm(at)slac(dot)stanford(dot)edu> |
Cc: | PostgreSQL-interfaces <pgsql-interfaces(at)postgresql(dot)org> |
Subject: | Re: Array elements (urgent help needed) |
Date: | 2004-10-08 17:17:59 |
Message-ID: | 14101.1097255879@sss.pgh.pa.us |
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Lists: | pgsql-interfaces |
Akbar Mokhtarani <akbarm(at)slac(dot)stanford(dot)edu> writes:
* A standard varlena array has the following internal structure:
This didn't quite agree with what I found but it gave me a starting point.
That's because it's describing the *internal* structure. Since you're
on 7.4, what you are actually seeing is the on-the-wire representation
emitted by array_send(), which looks like:
/* 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);
}
/* Send the array elements using the element's own sendproc */
/* (so N element values in whatever the datatype format is) */
regards, tom lane
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