classm.cs

精通网络应用系统开发 光盘 该书是人民邮电出版社出版的

using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.Linq;
using System.Collections.Generic;
/// <summary>
/// Summary description for ClassM
/// </summary>
public class ClassM
{
	public ClassM()
	{
	}
    public Table<Class> GetClasss()
    {
        DataClassesDataContext db = new DataClassesDataContext();
        Table<Class> classes;
        try
        {
            classes = db.Classes;
        }
        catch (Exception ex)
        {
            ///抛出执行数据库异常
            throw new Exception(ex.Message, ex);
        }

        ///返回从数据库获取的结果
        return (classes);
    }

    public IList<Class> GetClassByGrade(int nGradeID)
    {
        DataClassesDataContext db = new DataClassesDataContext();
        IList<Class> cla;
        try
        {
            cla = db.Classes.Where(c => c.GradeID == nGradeID).ToList();
        }
        catch (Exception ex)
        {
            ///抛出执行数据库异常
            throw new Exception(ex.Message, ex);
        }

        ///返回从数据库获取的结果
        return (cla);
    }


    public Class GetSingleClass(int nClassID)
    {
        DataClassesDataContext db = new DataClassesDataContext();
        Class cla;
        try
        {
            cla= db.Classes.Where(c => c.ClassID == nClassID).First();
        }
        catch (Exception ex)
        {
            ///抛出执行数据库异常
            throw new Exception(ex.Message, ex);
        }

        ///返回从数据库获取的结果
        return (cla);
    }

    public void AddClass(string sDesn, int nGradeID, int nTeacherID, DateTime dStartDate,
        DateTime dEndDate, int nStuNum)
    {
        DataClassesDataContext db = new DataClassesDataContext();
        try
        {
            Class cla = new Class { 
                Desn = sDesn, 
                GradeID = nGradeID,
                TeacherID = nTeacherID,
                StartDate = dStartDate,
                EndDate = dEndDate, 
                StuNum = nStuNum 
            };
            db.Classes.InsertOnSubmit(cla);
            db.SubmitChanges();
        }
        catch (Exception ex)
        {
            ///抛出执行数据库异常
            throw new Exception(ex.Message, ex);
        }
    }

    public void UpdateClass(int nClassID, string sDesn, int nGradeID, int nTeacherID,
        DateTime dStartDate, DateTime dEndDate, int nStuNum)
    {
        DataClassesDataContext db = new DataClassesDataContext();
        try
        {
            Class cla = db.Classes.Where(c => c.ClassID == nClassID).First();
            cla.Desn = sDesn;
            cla.GradeID = nGradeID;
            cla.TeacherID = nTeacherID;
            cla.StartDate = dStartDate;
            cla.EndDate = dEndDate;
            cla.StuNum = nStuNum;
            db.SubmitChanges();
        }
        catch (Exception ex)
        {
            ///抛出执行数据库异常
            throw new Exception(ex.Message, ex);
        }
    }

    public void DeleteClass(int nClassID)
    {
        DataClassesDataContext db = new DataClassesDataContext();
        try
        {
            Class cla = db.Classes.Where(c => c.ClassID == nClassID).First();
            db.Classes.DeleteOnSubmit(cla);
            db.SubmitChanges();

        }
        catch (Exception ex)
        {
            ///抛出执行数据库异常
            throw new Exception(ex.Message, ex);
        }
    }
}