DAL/MessageService.cs

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using System;
using System.Data;
using System.Text;
using System.Data.SqlClient;

namespace DAL
{
	/// <summary>
	/// 数据访问类:MessageService
	/// </summary>
	public partial class MessageService
	{
		public MessageService()
		{}
		#region  BasicMethod
        /// <summary>
        /// 更新信息为已读状态
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public static int UpdateStatus(int id)
        {
            string sql = "update Message set status = 1 where id = " + id;
            return DBHelperSQL.ExecuteSql(sql);
        }
        /// <summary>
        /// 查询未读信息数量
        /// </summary>
        /// <param name="shoperId"></param>
        /// <returns></returns>
        public static int GetMesCount(int shoperId)
        {
            string sql = "select count(*) from Message where shopId = " + shoperId + " and status = 0";
            object obj = DBHelperSQL.GetSingle(sql);
            if(obj != null)
            {
                return Convert.ToInt32(obj);
            }
            return 0;
        }

		/// <summary>
		/// 是否存在该记录
		/// </summary>
		public bool Exists(int id)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("select count(1) from Message");
			strSql.Append(" where id=@id");
			SqlParameter[] parameters = {
					new SqlParameter("@id", SqlDbType.Int,4)
			};
			parameters[0].Value = id;

			return DBHelperSQL.Exists(strSql.ToString(),parameters);
		}


		/// <summary>
		/// 增加一条数据