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Re: libpq (C++) - Insert binary data

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thanks for this tip, but as far as I understand it libpqtypes is not part of the original lipq libary . This will result in the same problem as with the Qt libraries, it will add another dependecy to my plugin, which is not allowed.

Chris

On 2010/09/30 10:59 PM, Merlin Moncure wrote:
On Thu, Sep 30, 2010 at 11:42 AM, GOO Creations<goocreations@xxxxxxxxx>  wrote:
  Yes there is a reason I'm not using Qt's libraries. Qt doesn't come out
with PSQL as default driver (meaning you have to manually download the
driver for Qt postgres). I'm developing a plugin for an app that restricts
Qt, no extra depedncies are allowed. But the app has libpq as dependcy, so
I'm able to use that.
here is my response from the previous time I answered the question.
There a number of ways to deal with this (my favorite by far is
libpqtypes, but I'm quite biased!):

On Wed, Jul 21, 2010 at 9:27 AM, Merlin Moncure<mmoncure@xxxxxxxxx>  wrote:
On Mon, Jul 19, 2010 at 8:14 PM, vinicius_bra<viniciusams@xxxxxxxxxxxx>  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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