/// <summary>
        /// 增加一条数据
        /// </summary>
        public int Add(LPWeb.Model.ContactActivities model)
        {
            StringBuilder strSql = new StringBuilder();

            strSql.Append("insert into ContactActivities(");
            strSql.Append("ContactId,UserId,ActivityName,ActivityTime)");
            strSql.Append(" values (");
            strSql.Append("@ContactId,@UserId,@ActivityName,@ActivityTime)");
            strSql.Append(";select @@IDENTITY");
            SqlParameter[] parameters =
            {
                new SqlParameter("@ContactId",    SqlDbType.Int,        4),
                new SqlParameter("@UserId",       SqlDbType.Int,        4),
                new SqlParameter("@ActivityName", SqlDbType.NVarChar, 500),
                new SqlParameter("@ActivityTime", SqlDbType.DateTime)
            };
            parameters[0].Value = model.ContactId;
            parameters[1].Value = model.UserId;
            parameters[2].Value = model.ActivityName;
            parameters[3].Value = model.ActivityTime;

            object obj = DbHelperSQL.GetSingle(strSql.ToString(), parameters);

            if (obj == null)
            {
                return(1);
            }
            else
            {
                return(Convert.ToInt32(obj));
            }
        }
        /// <summary>
        /// 更新一条数据
        /// </summary>
        public void Update(LPWeb.Model.ContactActivities model)
        {
            StringBuilder strSql = new StringBuilder();

            strSql.Append("update ContactActivities set ");
            strSql.Append("ContactActivityId=@ContactActivityId,");
            strSql.Append("ContactId=@ContactId,");
            strSql.Append("UserId=@UserId,");
            strSql.Append("ActivityName=@ActivityName,");
            strSql.Append("ActivityTime=@ActivityTime");
            strSql.Append(" where ContactActivityId=@ContactActivityId ");
            SqlParameter[] parameters =
            {
                new SqlParameter("@ContactActivityId", SqlDbType.Int,        4),
                new SqlParameter("@ContactId",         SqlDbType.Int,        4),
                new SqlParameter("@UserId",            SqlDbType.Int,        4),
                new SqlParameter("@ActivityName",      SqlDbType.NVarChar, 500),
                new SqlParameter("@ActivityTime",      SqlDbType.DateTime)
            };
            parameters[0].Value = model.ContactActivityId;
            parameters[1].Value = model.ContactId;
            parameters[2].Value = model.UserId;
            parameters[3].Value = model.ActivityName;
            parameters[4].Value = model.ActivityTime;

            DbHelperSQL.ExecuteSql(strSql.ToString(), parameters);
        }
        /// <summary>
        /// 得到一个对象实体
        /// </summary>
        public LPWeb.Model.ContactActivities GetModel(int ContactActivityId)
        {
            StringBuilder strSql = new StringBuilder();

            strSql.Append("select  top 1 ContactActivityId,ContactId,UserId,ActivityName,ActivityTime from ContactActivities ");
            strSql.Append(" where ContactActivityId=@ContactActivityId ");
            SqlParameter[] parameters =
            {
                new SqlParameter("@ContactActivityId", SqlDbType.Int, 4)
            };
            parameters[0].Value = ContactActivityId;

            LPWeb.Model.ContactActivities model = new LPWeb.Model.ContactActivities();
            DataSet ds = DbHelperSQL.Query(strSql.ToString(), parameters);

            if (ds.Tables[0].Rows.Count > 0)
            {
                if (ds.Tables[0].Rows[0]["ContactActivityId"].ToString() != "")
                {
                    model.ContactActivityId = int.Parse(ds.Tables[0].Rows[0]["ContactActivityId"].ToString());
                }
                if (ds.Tables[0].Rows[0]["ContactId"].ToString() != "")
                {
                    model.ContactId = int.Parse(ds.Tables[0].Rows[0]["ContactId"].ToString());
                }
                if (ds.Tables[0].Rows[0]["UserId"].ToString() != "")
                {
                    model.UserId = int.Parse(ds.Tables[0].Rows[0]["UserId"].ToString());
                }
                model.ActivityName = ds.Tables[0].Rows[0]["ActivityName"].ToString();
                if (ds.Tables[0].Rows[0]["ActivityTime"].ToString() != "")
                {
                    model.ActivityTime = DateTime.Parse(ds.Tables[0].Rows[0]["ActivityTime"].ToString());
                }
                return(model);
            }
            else
            {
                return(null);
            }
        }