student_course.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.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;

namespace sms
{
	/// <summary>
	/// student_course 的摘要说明。
	/// </summary>
	public class student_course : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button Btn_student;
		protected System.Web.UI.WebControls.DataGrid Dgd_sort;
		protected System.Web.UI.WebControls.Label Lbl_all;
		protected System.Web.UI.WebControls.TextBox Tbx_year;
		protected System.Web.UI.WebControls.Label Lbl_note;
		protected System.Web.UI.WebControls.Button Btn_exit;
		protected System.Web.UI.WebControls.DropDownList Ddl_course;
		protected System.Web.UI.WebControls.DropDownList Ddl_teacher;
	    SqlConnection cn;
		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 ();
				//课程名称下拉列表框绑定
				cn0.Open ();
				string mysql1="select * from course";
				SqlCommand cm1=new SqlCommand  (mysql1,cn0);
				SqlDataReader dr1=cm1.ExecuteReader ();
				while(dr1.Read ())
				{
					Ddl_course.Items .Add (new ListItem(dr1["Course_name"].ToString() ,dr1["Course_id"].ToString()) );
				}
				cn0.Close ();
			}
			// 在此处放置用户代码以初始化页面
			cn=new SqlConnection(strconn);
			
		}

		#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_student.Click += new System.EventHandler(this.Btn_student_Click);
			this.Btn_exit.Click += new System.EventHandler(this.Btn_exit_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void Btn_student_Click(object sender, System.EventArgs e)
		{ Bindgrid();		  
		}
		public void DataGrid_delete(object sender,DataGridCommandEventArgs e)
		{
			
			string strsql="delete from student_course where ID=@id";
			SqlCommand cm=new SqlCommand(strsql,cn);
			cm.Parameters.Add(new SqlParameter("@ID",SqlDbType.BigInt,8));
			cm.Parameters["@id"].Value=Dgd_sort.DataKeys[(int)e.Item.ItemIndex];
			cm.Connection.Open();
			try
			{
				cm.ExecuteNonQuery();
				Lbl_note.Text="删除成功";
				
			}
			catch(SqlException)
			{
				Lbl_note.Text="删除失败";
				Lbl_note.Style["color"]="red";
			}
			cm.Connection.Close();			
			Bindgrid();
		}
		
		public void Bindgrid()
		{
			string strsql="select student_course.ID,student.Student_id,student.Student_classid from student_course,student,teacher_course where student_course.Course_id='"+Ddl_course.SelectedItem.Value+"' and student_course.Course_year=teacher_course.Course_year and student_course.Course_year='"+Tbx_year.Text+"'and teacher_course.Teacher_id='"+Ddl_teacher.SelectedItem.Value+"'and student_course.Course_id=teacher_course.Course_id and student.Student_id=student_course.Student_id";
			SqlDataAdapter da=new SqlDataAdapter(strsql,cn);
			DataSet ds=new DataSet();
			da.Fill(ds);
			Dgd_sort.DataSource=ds;
			Dgd_sort.DataBind();
			string strsq="select COUNT(*) from student_course,student,teacher_course where student_course.Course_id='"+Ddl_course.SelectedItem.Value+"' and student_course.Course_year=teacher_course.Course_year and student_course.Course_year='"+Tbx_year.Text+"'and teacher_course.Teacher_id='"+Ddl_teacher.SelectedItem.Value+"'and student_course.Course_id=teacher_course.Course_id and student.Student_id=student_course.Student_id";
			SqlCommand cm1=new SqlCommand(strsq,cn);		
			cn.Open();
			SqlDataReader dr=cm1.ExecuteReader();
			if(dr.Read())
			{
					Lbl_all.Text="选课总人数为："+dr[0].ToString();
			}
			else
			{
				Lbl_all.Text="无人选此课";
			}
			cn.Close();
		}

		private void Btn_exit_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("default.aspx");
		}
		
	}
}