modifycourse.aspx.cs

一个学生管理系统的C++源程序

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace sms
{
    //该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)

	/// <summary>
	/// modifycourse 的摘要说明。
	/// </summary>
	public class modifycourse : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DropDownList Ddl_teacher;
		protected System.Web.UI.WebControls.DropDownList Ddl_class;
		protected System.Web.UI.WebControls.TextBox Tbx_year;
		protected System.Web.UI.WebControls.Button Btn_ok;
		protected System.Web.UI.WebControls.Label Lbl_note;
		protected System.Web.UI.WebControls.TextBox Tbx_course;
		protected System.Web.UI.WebControls.RequiredFieldValidator Rv_year;
		protected System.Web.UI.WebControls.Button Btn_delete;
	
		private void Page_Load(object sender, System.EventArgs e)
		{
			//教师名称下拉列表框绑定
			string strconn= ConfigurationSettings.AppSettings["dsn"];
			//连接本地计算机的sms数据库
			SqlConnection cn0= new SqlConnection (strconn);
			if(!IsPostBack)
			{	
				cn0.Open ();
				string mysql="select * from teacher";
				SqlCommand cm0=new SqlCommand  (mysql,cn0);
				SqlDataReader dr0=cm0.ExecuteReader ();
				while(dr0.Read ())
				{
					Ddl_teacher.Items .Add (new ListItem(dr0["Teacher_name"].ToString(),dr0["Teacher_id"].ToString()) );
				}
				cn0.Close ();				
				//班级名称下拉列表框绑定
				cn0.Open ();
				string mysql2="select * from class";
				SqlCommand cm2=new SqlCommand  (mysql2,cn0);
				SqlDataReader dr2=cm2.ExecuteReader ();
				while(dr2.Read ())
				{
					Ddl_class.Items .Add (new ListItem(dr2["Class_name"].ToString() ,dr2["Class_id"].ToString()) );
				}
				cn0.Close ();
				cn0.Open();
				string mysql1="select * from teacher_course where Course_id=@Course_id";
				SqlCommand cm1=new SqlCommand  (mysql1,cn0);				
				cm1.Parameters.Add(new SqlParameter("@Course_id",SqlDbType.VarChar,50));
				cm1.Parameters["@Course_id"].Value=Request.QueryString["Course_id"].ToString();
                SqlDataReader dr1=cm1.ExecuteReader ();
				if(dr1.Read())
				{
					Tbx_course.Text=dr1["Course_id"].ToString();
					Ddl_teacher.Items.FindByValue(dr1["Teacher_id"].ToString()).Selected=true;
					Ddl_class.Items.FindByValue(dr1["Class_id"].ToString()).Selected=true;
					Ddl_class.Items.FindByValue(dr1["Class_id"].ToString()).Attributes.CssStyle["color"]="red";
					Tbx_year.Text=dr1["Course_year"].ToString();
				}
				else
			   {Response.Write("此课程未分配教师！请返回");
				Response.End();				
			   }
			    cn0.Close();
			}

		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.Btn_ok.Click += new System.EventHandler(this.Btn_ok_Click);
			this.Btn_delete.Click += new System.EventHandler(this.Btn_delete_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void Btn_ok_Click(object sender, System.EventArgs e)
		{
			string strconn= ConfigurationSettings.AppSettings["dsn"];
		    SqlConnection cn=new SqlConnection(strconn);
			cn.Open();
			string strsql="update teacher_course set Teacher_id=@Teacher_id,Class_id=@Class_id,Course_year=@Course_year where Course_id=@Course_id";
			SqlCommand cm=new SqlCommand(strsql,cn);				
			cm.Parameters.Add(new SqlParameter("@Course_id",SqlDbType.VarChar,50));
			cm.Parameters.Add(new SqlParameter("@Teacher_id",SqlDbType.VarChar,50));
			cm.Parameters.Add(new SqlParameter("@Class_id",SqlDbType.VarChar,50));
			cm.Parameters.Add(new SqlParameter("@Course_year",SqlDbType.VarChar,50));
			cm.Parameters["@Course_id"].Value=Request.QueryString["Course_id"].ToString();
            cm.Parameters["@Teacher_id"].Value=Ddl_teacher.SelectedItem.Value;
            cm.Parameters["@Class_id"].Value=Ddl_class.SelectedItem.Value;
			cm.Parameters["@course_year"].Value=Tbx_year.Text;			
			cm.ExecuteNonQuery();
			try
			{
			Lbl_note.Text="修改成功，请返回！";
			}
			catch
			{
					Lbl_note.Text="修改有误，请检查输入！";
			 }
           cn.Close();
		}

		private void Btn_delete_Click(object sender, System.EventArgs e)
		{
				string strconn= ConfigurationSettings.AppSettings["dsn"];
			SqlConnection cn=new SqlConnection(strconn);
			cn.Open();
			string strsql="delete from teacher_course  where Teacher_id=@Teacher_id and Class_id=@Class_id and Course_year=@Course_year and Course_id=@Course_id";
			SqlCommand cm=new SqlCommand  (strsql,cn);
			
				cm.Parameters.Add(new SqlParameter("@Course_id",SqlDbType.VarChar,50));
				cm.Parameters.Add(new SqlParameter("@Teacher_id",SqlDbType.VarChar,50));
				cm.Parameters.Add(new SqlParameter("@Class_id",SqlDbType.VarChar,50));
				cm.Parameters.Add(new SqlParameter("@Course_year",SqlDbType.VarChar,50));
				cm.Parameters["@Course_id"].Value=Tbx_course.Text;
				cm.Parameters["@Teacher_id"].Value=Ddl_teacher.SelectedItem.Value;
				cm.Parameters["@Class_id"].Value=Ddl_class.SelectedItem.Value;
				cm.Parameters["@course_year"].Value=Tbx_year.Text;
			try
			{	
				cm.ExecuteNonQuery();
				Lbl_note.Text="删除成功，请返回！";
				Btn_ok.Enabled=false;
				Btn_delete.Enabled=false;
			}
			catch
			{
				Lbl_note.Text="删除有误,请查明对应关系，再做删除！";
				}
			cn.Close();		
		}		
	}
}