MessageDAL

using System;
using System.Data;
using System.Text;
using System.Data.SqlClient;
namespace Website.DAL
{
	/// <summary>
	/// 数据访问类Message。
	/// </summary>
	public class Message
	{
		public Message()
		{}
		#region  成员方法

		/// <summary>
		/// 得到最大ID
		/// </summary>
		public int GetMaxId()
		{
		return DbHelperSQL.GetMaxID("MessageId", "Message"); 
		}

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

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


		/// <summary>
		/// 增加一条数据
		/// </summary>
		public int Add(Website.Model.Message model)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("insert into Message(");
			strSql.Append("MessageContent,MessageAddTime,MessageAddId,MessageToId,MessageIsDisplay)");
			strSql.Append(" values (");
			strSql.Append("@MessageContent,@MessageAddTime,@MessageAddId,@MessageToId,@MessageIsDisplay)");
			strSql.Append(";select @@IDENTITY");
			SqlParameter[] parameters = {
					new SqlParameter("@MessageContent", SqlDbType.VarChar,400),
					new SqlParameter("@MessageAddTime", SqlDbType.DateTime),
					new SqlParameter("@MessageAddId", SqlDbType.Int,4),
					new SqlParameter("@MessageToId", SqlDbType.Int,4),
					new SqlParameter("@MessageIsDisplay", SqlDbType.Int,4)};
			parameters[0].Value = model.MessageContent;
			parameters[1].Value = model.MessageAddTime;
			parameters[2].Value = model.MessageAddId;
			parameters[3].Value = model.MessageToId;
			parameters[4].Value = model.MessageIsDisplay;

			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(Website.Model.Message model)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("update Message set ");
			strSql.Append("MessageContent=@MessageContent,");
			strSql.Append("MessageAddTime=@MessageAddTime,");
			strSql.Append("MessageAddId=@MessageAddId,");
			strSql.Append("MessageToId=@MessageToId,");
			strSql.Append("MessageIsDisplay=@MessageIsDisplay");
			strSql.Append(" where MessageId=@MessageId ");
			SqlParameter[] parameters = {
					new SqlParameter("@MessageId", SqlDbType.Int,4),
					new SqlParameter("@MessageContent", SqlDbType.VarChar,400),
					new SqlParameter("@MessageAddTime", SqlDbType.DateTime),
					new SqlParameter("@MessageAddId", SqlDbType.Int,4),
					new SqlParameter("@MessageToId", SqlDbType.Int,4),
					new SqlParameter("@MessageIsDisplay", SqlDbType.Int,4)};
			parameters[0].Value = model.MessageId;
			parameters[1].Value = model.MessageContent;
			parameters[2].Value = model.MessageAddTime;
			parameters[3].Value = model.MessageAddId;
			parameters[4].Value = model.MessageToId;
			parameters[5].Value = model.MessageIsDisplay;

			DbHelperSQL.ExecuteSql(strSql.ToString(),parameters);
		}

		/// <summary>
		/// 删除一条数据
		/// </summary>
		public void Delete(int MessageId)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("delete Message ");
			strSql.Append(" where MessageId=@MessageId ");
			SqlParameter[] parameters = {
					new SqlParameter("@MessageId", SqlDbType.Int,4)};
			parameters[0].Value = MessageId;

			DbHelperSQL.ExecuteSql(strSql.ToString(),parameters);
		}


		/// <summary>
		/// 得到一个对象实体
		/// </summary>
		public Website.Model.Message GetModel(int MessageId)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("select MessageId,MessageContent,MessageAddTime,MessageAddId,MessageToId,MessageIsDisplay from Message ");
			strSql.Append(" where MessageId=@MessageId ");
			SqlParameter[] parameters = {
					new SqlParameter("@MessageId", SqlDbType.Int,4)};
			parameters[0].Value = MessageId;

			Website.Model.Message model=new Website.Model.Message();
			DataSet ds=DbHelperSQL.Query(strSql.ToString(),parameters);
			if(ds.Tables[0].Rows.Count>0)
			{
				if(ds.Tables[0].Rows[0]["MessageId"].ToString()!="")
				{
					model.MessageId=int.Parse(ds.Tables[0].Rows[0]["MessageId"].ToString());
				}
				model.MessageContent=ds.Tables[0].Rows[0]["MessageContent"].ToString();
				if(ds.Tables[0].Rows[0]["MessageAddTime"].ToString()!="")
				{
					model.MessageAddTime=DateTime.Parse(ds.Tables[0].Rows[0]["MessageAddTime"].ToString());
				}
				if(ds.Tables[0].Rows[0]["MessageAddId"].ToString()!="")
				{
					model.MessageAddId=int.Parse(ds.Tables[0].Rows[0]["MessageAddId"].ToString());
				}
				if(ds.Tables[0].Rows[0]["MessageToId"].ToString()!="")
				{
					model.MessageToId=int.Parse(ds.Tables[0].Rows[0]["MessageToId"].ToString());
				}
				if(ds.Tables[0].Rows[0]["MessageIsDisplay"].ToString()!="")
				{
					model.MessageIsDisplay=int.Parse(ds.Tables[0].Rows[0]["MessageIsDisplay"].ToString());
				}
				return model;
			}
			else
			{
			return null;
			}
		}

		/// <summary>
		/// 获得数据列表
		/// </summary>
		public DataSet GetList(string strWhere)
		{
			StringBuilder strSql=new StringBuilder();
			strSql.Append("select MessageId,MessageContent,MessageAddTime,MessageAddId,MessageToId,MessageIsDisplay ");
			strSql.Append(" FROM Message ");
			if(strWhere.Trim()!="")
			{
				strSql.Append(" where "+strWhere);
			}
			return DbHelperSQL.Query(strSql.ToString());
		}

		/*
		/// <summary>
		/// 分页获取数据列表
		/// </summary>
		public DataSet GetList(int PageSize,int PageIndex,string strWhere)
		{
			SqlParameter[] parameters = {
					new SqlParameter("@tblName", SqlDbType.VarChar, 255),
					new SqlParameter("@fldName", SqlDbType.VarChar, 255),
					new SqlParameter("@PageSize", SqlDbType.Int),
					new SqlParameter("@PageIndex", SqlDbType.Int),
					new SqlParameter("@IsReCount", SqlDbType.Bit),
					new SqlParameter("@OrderType", SqlDbType.Bit),
					new SqlParameter("@strWhere", SqlDbType.VarChar,1000),
					};
			parameters[0].Value = "Message";
			parameters[1].Value = "ID";
			parameters[2].Value = PageSize;
			parameters[3].Value = PageIndex;
			parameters[4].Value = 0;
			parameters[5].Value = 0;
			parameters[6].Value = strWhere;	
			return DbHelperSQL.RunProcedure("UP_GetRecordByPage",parameters,"ds");
		}*/

		#endregion  成员方法
	}
}

 

转载于:https://www.cnblogs.com/lx1988729/archive/2013/05/27/3100851.html