批量更新list<string,string>

        public void UpdateList(List<MysqlModule.Model.pro_premanifest> modelList)
        {

            List<MySqlParameter> parameterList = new List<MySqlParameter>();

            int x = modelList.Count;
            Hashtable SQLStringList = new Hashtable();
            for (int i = 0; i < x; i++)
            {
                StringBuilder strSql = new StringBuilder();
                strSql.Append("update pro_premanifest set ");
                MysqlModule.Model.pro_premanifest mani = modelList[i];
                int y = 0;
                if (mani.checks != null)
                {
                    strSql.Append("checks=@checks,");
                    parameterList.Add(new MySqlParameter("@checks", MySqlDbType.Int32, 11));
                    parameterList[y].Value = mani.checks;
                    y = y + 1;
                }
                if (mani.reason != null)
                {
                    strSql.Append("reason=@reason,");
                    parameterList.Add(new MySqlParameter("@reason", MySqlDbType.VarChar, 50));
                    parameterList[y].Value = mani.reason;
                    y = y + 1;
                }
                if (mani.audit_by != null)
                {
                    strSql.Append("audit_by=@audit_by,");
                    parameterList.Add(new MySqlParameter("@audit_by", MySqlDbType.VarChar, 50));
                    parameterList[y].Value = mani.audit_by;
                    y = y + 1;
                }
                if (mani.audit_time != null)
                {
                    strSql.Append("audit_time=@audit_time,");
                    parameterList.Add(new MySqlParameter("@audit_time", MySqlDbType.DateTime));
                    parameterList[y].Value = mani.audit_time;
                    y = y + 1;
                }
                strSql = strSql.Remove(strSql.Length - 1, 1);
                strSql.Append(" where id=@id; ");
                parameterList.Add(new MySqlParameter("@id", MySqlDbType.VarChar, 50));
                parameterList[y].Value = mani.id;
                MySqlParameter[] parameters = parameterList.ToArray(); ;
                SQLStringList.Add(strSql, parameters);
                parameterList.Clear();
            }
            DbHelperMySQL.ExecuteSqlTran(SQLStringList);
        }