Bug? {? = CALL insert_page_segment (?, ?)}

Hi!

I have a problem with newer versions of the ODBC driver. I made a small
testing example to reproduce the problem:

The following code works fine with version 09.02.0100 of the driver. With
09.03.0210, it crashes. With 09.03.0400, I get a strange exception and error
message.

This is all on Windows, 32-Bit. I tried Windows 7 and Windows 8.1; I also
tried Postgres versions 9.2.4, 9.2.9, 9.3.4 and 9.3.5, all 32-Bit.

Here is the create script for the database:

CREATE TABLE page_segments (
task_id uuid,
id uuid,
PRIMARY KEY (task_id, id)
);

CREATE FUNCTION insert_page_segment(theTaskId uuid, theId uuid) RETURNS int
AS $$
DECLARE
ret int NOT NULL := 0;
BEGIN
BEGIN
INSERT INTO page_segments (task_id, id) VALUES (theTaskId,
theId);
ret := 1;
EXCEPTION WHEN unique_violation THEN
-- ignore
END;
RETURN ret;
END
$$ LANGUAGE plpgsql;

And here is some C# code that calls the insert_page_segment function:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.Odbc;

namespace ODBCTest
{
class Program
{
const string ConnString = @"Driver={PostgreSQL
Unicode};server=localhost;port=5432;database=stringtest;uid=cartan;pwd=...";
static void Main(string[] args)
{
using (var conn = new OdbcConnection(ConnString))
{
conn.Open();
Guid g1 = Guid.NewGuid();
Guid g2 = Guid.NewGuid();
Console.WriteLine("First call returns {0}",
CallTheFunc(conn, g1, g2));
}
Console.WriteLine("Press any key to exit...");
Console.ReadKey(true);
}

static int CallTheFunc(OdbcConnection conn, Guid taskId, Guid id)
{
using (var trans = conn.BeginTransaction())
{
try
{
const string insertCmdText = @"{? = CALL
insert_page_segment (?, ?)}";
using (var insertCmd = new OdbcCommand(insertCmdText,
conn, trans))
{
var retParam = new OdbcParameter();
retParam.OdbcType = OdbcType.Int;
retParam.Direction = ParameterDirection.ReturnValue;
insertCmd.Parameters.Add(retParam);

var taskIdParam = new OdbcParameter();
taskIdParam.OdbcType = OdbcType.UniqueIdentifier;
taskIdParam.Value = taskId;
insertCmd.Parameters.Add(taskIdParam);

var idParam = new OdbcParameter();
idParam.OdbcType = OdbcType.UniqueIdentifier;
idParam.Value = id;
insertCmd.Parameters.Add(idParam);

insertCmd.ExecuteNonQuery();
int ret = (int) retParam.Value;

trans.Commit();
return ret;
}
}
catch
{
trans.Rollback();
throw;
}
}
}
}
}

With the old 9.2.1 driver, the function just returns 1 as expected. With
9.3.4, I get an unusual InvalidOperationException in ExecuteNonQuery(),
saying

"This OdbcTransaction has completed; it is no longer usable."

In the Postgres log file, I find this message:

2014-11-11 17:26:04 CET ERROR: function insert_page_segment(unknown) does
not exist at character 8
2014-11-11 17:26:04 CET HINT: No function matches the given name and
argument types. You might need to add explicit type casts.
2014-11-11 17:26:04 CET STATEMENT: SELECT insert_page_segment ($1, $2)
2014-11-11 17:26:04 CET FATAL: invalid frontend message type 0

Can anybody help me with this?

Regards,
--
Nils Gösche
Don’t ask for whom the <Ctrl-G> tolls.