picture.cs

ASP.NET网络编程从入门到精通书的源代码资料

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

/// <summary>
	/// Summary description for Picture
	/// </summary>
public class Picture
{
	public SqlDataReader GetPictures()
	{
		///定义类SQLHelper
		SQLHelper sqlHelper = new SQLHelper();

		///定义保存从数据库获取的结果的DataReader
		SqlDataReader dr = null;

		try
		{
			///执行存储过程
			sqlHelper.RunProc("Pr_GetPictures",out dr);
		}
		catch(Exception ex)
		{
			///抛出执行数据库异常
			SQLHelper.CreateErrorMsg(ex.Message);
			throw new Exception(ex.Message,ex);
		}

		///返回从数据库获取的结果
		return (dr);
	}	

	public SqlDataReader GetSinglePicture(int nPictureID)
	{
		///定义类SQLHelper
		SQLHelper sqlHelper = new SQLHelper();

		///定义保存从数据库获取的结果的DataReader
		SqlDataReader dr = null;

		///创建访问数据库的参数			
		SqlParameter[] paramList = {
			sqlHelper.CreateInParam("@PictureID",SqlDbType.Int,4,nPictureID)
		};

		try
		{
			///执行存储过程
			sqlHelper.RunProc("Pr_GetSinglePicture",paramList,out dr);
		}
		catch(Exception ex)
		{
			///抛出执行数据库异常
			SQLHelper.CreateErrorMsg(ex.Message);
			throw new Exception(ex.Message,ex);
		}

		///返回从数据库获取的结果
		return (dr);
	}

	public int AddPicture(string sDesn,string sType,byte[] bData)
	{
		///定义类SQLHelper
		SQLHelper sqlHelper = new SQLHelper();

		///创建访问数据库的参数			
		SqlParameter[] paramList = {
			sqlHelper.CreateInParam("@Desn",SqlDbType.VarChar,200,sDesn),			
			sqlHelper.CreateInParam("@Type",SqlDbType.VarChar,200,sType),
			sqlHelper.CreateInParam("@Data",SqlDbType.Image,2147483647,bData)
		};

		try
		{
			///执行存储过程
			return (sqlHelper.RunProc("Pr_AddPicture",paramList));
		}
		catch(Exception ex)
		{
			///抛出执行数据库异常
			SQLHelper.CreateErrorMsg(ex.Message);
			throw new Exception(ex.Message,ex);
		}
	}	

	public void DeletePicture(int nPictureID)
	{
		///定义类SQLHelper
		SQLHelper sqlHelper = new SQLHelper();

		///创建访问数据库的参数			
		SqlParameter[] paramList = {
			sqlHelper.CreateInParam("@PictureID",SqlDbType.Int,4,nPictureID)
		};

		try
		{
			///执行存储过程
			sqlHelper.RunProc("Pr_DeletePicture",paramList);
		}
		catch(Exception ex)
		{
			///抛出执行数据库异常
			SQLHelper.CreateErrorMsg(ex.Message);
			throw new Exception(ex.Message,ex);
		}
	}
}