grade.cs

《精通ASP.NET2.0网络应用系统开发》书中的源码

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;
using SQLHelper;

namespace StudentManager
{
	/// <summary>
	/// Summary description for Grade
	/// </summary>
	public class Grade
	{
		public SqlDataReader GetGrades()
		{
			///定义类SQLHelper
			SQLHelper.SQLHelper sqlHelper = new SQLHelper.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_GetGrades",out dr);
			}
			catch (Exception ex)
			{
				///抛出执行数据库异常
				SystemError.CreateErrorLog(ex.Message);
				throw new Exception(ex.Message,ex);
			}

			///返回从数据库获取的结果
			return (dr);
		}

		public SqlDataReader GetSingleGrade(int nGradeID)
		{
			///定义类SQLHelper
			SQLHelper.SQLHelper sqlHelper = new SQLHelper.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("@GradeID",SqlDbType.Int,4,nGradeID)
			};

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

			///返回从数据库获取的结果
			return (dr);
		}

		public int AddGrade(string sDesn,int nYearDate,int nSemester)
		{
			///定义类SQLHelper
			SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();

			///创建访问数据库的参数			
			SqlParameter[] paramList = {
				sqlHelper.CreateInParam("@Desn",SqlDbType.VarChar,200,sDesn),										  
				sqlHelper.CreateInParam("@YearDate",SqlDbType.Int,4,nYearDate),
				sqlHelper.CreateInParam("@Semester",SqlDbType.Int,4,nSemester)
			};

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

		public void UpdateGrade(int nGradeID,string sDesn,int nYearDate,int nSemester)
		{
			///定义类SQLHelper
			SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();

			///创建访问数据库的参数			
			SqlParameter[] paramList = {
				sqlHelper.CreateInParam("@GradeID",SqlDbType.Int,4,nGradeID),
                sqlHelper.CreateInParam("@Desn",SqlDbType.VarChar,200,sDesn),										  
				sqlHelper.CreateInParam("@YearDate",SqlDbType.Int,4,nYearDate),
				sqlHelper.CreateInParam("@Semester",SqlDbType.Int,4,nSemester)
			};

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

		public void DeleteGrade(int nGradeID)
		{
			///定义类SQLHelper
			SQLHelper.SQLHelper sqlHelper = new SQLHelper.SQLHelper();

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

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