From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
---|---|
To: | vinicius_bra <viniciusams(at)yahoo(dot)com(dot)br> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Insert and Retrieve unsigned char sequences using C |
Date: | 2010-07-21 13:27:52 |
Message-ID: | AANLkTim20LThxT_kBIPHDSx_AtY0hgjdKxJ6CZLJRa2u@mail.gmail.com |
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Lists: | pgsql-general |
On Mon, Jul 19, 2010 at 8:14 PM, vinicius_bra <viniciusams(at)yahoo(dot)com(dot)br> wrote:
>
> Hi All,
>
> I'm developing a system in C and I have a unsigned char pointer that
> represents a struct and I like to store it in a bytea column in postgreSQL.
> How can I do it?
> Example:
you have several options:
*) encode the memory for the structure PQescapeStringConn and send to
PQexec (my least favorite method)
*) set up a call to PQexecParams (more work, but faster and no escaping)
*) make a composite type on the server and send your structure in a
more classical SQL way
*) use libpqtypes (this is the most set up work, but the best in the
long run) :-)
w/libpqtypes:
PGbytea b = {sizeof(s), &s};
PGresult *res = PQexecf(conn, "insert into t values (%bytea)", b);
PQclear(res);
merlin
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