private void AddReferrersParametersToCommand(Referrer referrer, DbConnectionHelper conn, DbCommand cmd)
{
var parms = cmd.Parameters;
parms.Add(conn.CreateParameter("BlogId", Blog.CurrentInstance.Id.ToString()));
parms.Add(conn.CreateParameter("ReferrerId", referrer.Id.ToString()));
parms.Add(conn.CreateParameter(FormatParamName("ReferralDay"), referrer.Day));
parms.Add(conn.CreateParameter(FormatParamName("ReferrerUrl"), (referrer.ReferrerUrl != null ? (object)referrer.ReferrerUrl.ToString() : DBNull.Value)));
parms.Add(conn.CreateParameter(FormatParamName("ReferralCount"), referrer.Count));
parms.Add(conn.CreateParameter(FormatParamName("Url"), (referrer.Url != null ? (object)referrer.Url.ToString() : DBNull.Value)));
parms.Add(conn.CreateParameter(FormatParamName("IsSpam"), referrer.PossibleSpam));
}