Npgsql.NpgsqlCommand.ExecuteNonQuery C# (CSharp) Method

        public override Int32 ExecuteNonQuery()
        {
            //We treat this as a simple wrapper for calling ExecuteReader() and then
            //update the records affected count at every call to NextResult();
            NpgsqlEventLog.LogMethodEnter(LogLevel.Debug, CLASSNAME, "ExecuteNonQuery");
            int? ret = null;
            using (NpgsqlDataReader rdr = GetReader(CommandBehavior.SequentialAccess))
            {
                do
                {
                    int thisRecord = rdr.RecordsAffected;
                    if (thisRecord != -1)
                    {
                        ret = (ret ?? 0) + thisRecord;
                    }
                    lastInsertedOID = rdr.LastInsertedOID ?? lastInsertedOID;
                }
                while (rdr.NextResult());
            }
            return ret ?? -1;
        }

        public void Long([Values(CommandBehavior.Default, CommandBehavior.SequentialAccess)] CommandBehavior behavior)
        {
            var builder = new StringBuilder("ABCDEééé", Conn.BufferSize);
            builder.Append('X', Conn.BufferSize);
            var expected = builder.ToString();
            ExecuteNonQuery("CREATE TEMP TABLE data (name TEXT)");
            var cmd = new NpgsqlCommand(@"INSERT INTO data (name) VALUES (@p)", Conn);
            cmd.Parameters.Add(new NpgsqlParameter("p", expected));
            cmd.ExecuteNonQuery();

            const string queryText = @"SELECT name, 'foo', name, name, name, name FROM data";
            cmd = new NpgsqlCommand(queryText, Conn);
            var reader = cmd.ExecuteReader(behavior);
            reader.Read();

            var actual = reader[0];
            Assert.That(actual, Is.EqualTo(expected));

            if (IsSequential(behavior))
                Assert.That(() => reader[0], Throws.Exception.TypeOf<InvalidOperationException>(), "Seek back sequential");
            else
                Assert.That(reader[0], Is.EqualTo(expected));

            Assert.That(reader.GetString(1), Is.EqualTo("foo"));
            Assert.That(reader.GetFieldValue<string>(2), Is.EqualTo(expected));
            Assert.That(reader.GetValue(3), Is.EqualTo(expected));
            Assert.That(reader.GetFieldValue<string>(4), Is.EqualTo(expected));
            Assert.That(reader.GetFieldValue<char[]>(5), Is.EqualTo(expected.ToCharArray()));
        }