sortcourse.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>
	/// sortcourse 的摘要说明。
	/// </summary>
	public class sortcourse : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DataGrid Dgd_sort;
		protected System.Web.UI.WebControls.TextBox Tbx_courseid;
		protected System.Web.UI.WebControls.TextBox Tbx_year;
		protected System.Web.UI.WebControls.Button Btn_look;
		protected System.Web.UI.WebControls.TextBox Tbx_teacher;
		protected System.Web.UI.WebControls.TextBox Tbx_term;
		protected System.Web.UI.WebControls.Button Btn_sort;
		protected System.Web.UI.WebControls.Label Lbl_all;
		protected System.Web.UI.WebControls.Label Lbl_note;
		protected System.Web.UI.WebControls.Button Btn_yes;
		protected System.Web.UI.WebControls.Button Btn_no;
		protected System.Web.UI.WebControls.Panel Pn_yes;
		protected System.Web.UI.WebControls.CustomValidator Cv_course;
		protected System.Web.UI.WebControls.RequiredFieldValidator Rfv_year;
		SqlConnection cn;
		protected System.Web.UI.WebControls.DropDownList Ddl_course;string strsql;
		private void Page_Load(object sender, System.EventArgs e)
		{	string strconn= ConfigurationSettings.AppSettings["dsn"];
			cn=new SqlConnection(strconn);	
			if(!IsPostBack)
			{
				//课程名称下拉列表框绑定
				
				SqlConnection cn0=new SqlConnection(strconn);	
				cn0.Open ();
				string mysql1="select * from course where Course_kind='2'";
				SqlCommand cm1=new SqlCommand (mysql1,cn0);
				SqlDataReader dr1=cm1.ExecuteReader ();
				Ddl_course.Items .Add (new ListItem("","") );
				while(dr1.Read ())
				{
					Ddl_course.Items .Add (new ListItem(dr1["Course_name"].ToString() ,dr1["Course_id"].ToString()) );
				}
				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_sort.Click += new System.EventHandler(this.Btn_sort_Click);
			this.Cv_course.ServerValidate += new System.Web.UI.WebControls.ServerValidateEventHandler(this.Cv_course_ServerValidate);
			this.Btn_yes.Click += new System.EventHandler(this.Btn_yes_Click);
			this.Btn_no.Click += new System.EventHandler(this.Btn_no_Click);
			this.Btn_look.Click += new System.EventHandler(this.Btn_look_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void Btn_sort_Click(object sender, System.EventArgs e)
		{
			
			string strsq="select COUNT(Student_id) from student_course where Course_id='"+Tbx_courseid.Text+"' and Course_year='"+Tbx_year.Text+"'";
			SqlCommand cm1=new SqlCommand(strsq,cn);		
			cn.Open();
			SqlDataReader dr=cm1.ExecuteReader();
			if(dr.Read())
			{
				Lbl_all.Text="选此课总人数为："+dr[0].ToString();
            }
			else
			{
				Lbl_all.Text="无人选此课";
			}
			Pn_yes.Visible=true;
			cn.Close();
		
		}
	  
		private void Btn_yes_Click(object sender, System.EventArgs e)
		{
		    strsql="insert into student_course(Student_id,Course_id,Course_year) values(@Student_id,@Course_id,@Course_year)";
			SqlCommand cm=new SqlCommand(strsql,cn);
			cm.Parameters.Add(new SqlParameter("@Student_id",SqlDbType.VarChar,50));
			cm.Parameters.Add(new SqlParameter("@Course_id",SqlDbType.VarChar,50));
			cm.Parameters.Add(new SqlParameter("@Course_year",SqlDbType.VarChar,50));
			cm.Parameters["@Student_id"].Value=Session["User_id"].ToString();
			cm.Parameters["@Course_id"].Value=Tbx_courseid.Text;
			cm.Parameters["@Course_year"].Value=Tbx_year.Text;
			cn.Open();
			try
			{
				cm.ExecuteNonQuery();
			}
			catch(SqlException)
			{
				Lbl_note.Text="添加失败!";
			}
            
			cn.Close();
		
		}

		private void Btn_no_Click(object sender, System.EventArgs e)
		{
		 Lbl_all.Text="请重新选择";
		}

		private void Cv_course_ServerValidate(object source, System.Web.UI.WebControls.ServerValidateEventArgs args)
		{			
			cn.Open();
			strsql="select * from course where Course_id='"+Tbx_courseid.Text+"'";
			SqlCommand cm=new SqlCommand(strsql,cn);
			SqlDataReader dr=cm.ExecuteReader();
			if(dr.Read())
			{
				args.IsValid=true;
			}
			else
			{
				args.IsValid=false;
			}
			cn.Close();
		}

		private void Btn_look_Click(object sender, System.EventArgs e)
		{
			if(Ddl_course.SelectedItem.Text=="")
			{
				if(Tbx_teacher.Text=="")
				{strsql="select course.Course_name,course.Course_id,teacher.Teacher_name,course.Course_credit,course.Course_period from course,teacher,teacher_course where teacher_course.Course_year='"+Tbx_term.Text+"' and teacher_course.Course_id=course.Course_id and teacher_course.Teacher_id=teacher.Teacher_id";
				}
				else
				{
				strsql="select course.Course_name,course.Course_id,teacher.Teacher_name,course.Course_credit,course.Course_period from course,teacher,teacher_course where teacher_course.Course_year='"+Tbx_term.Text+"' and teacher_course.Course_id=course.Course_id and teacher_course.Teacher_id=teacher.Teacher_id and teacher.Teacher_name='"+Tbx_teacher.Text+"'";
			
				}
			}
			else
			{
				if(Tbx_teacher.Text=="")
				{
				strsql="select course.Course_name,course.Course_id,teacher.Teacher_name,course.Course_credit,course.Course_period from course,teacher,teacher_course where teacher_course.Course_year='"+Tbx_term.Text+"' and teacher_course.Course_id=course.Course_id and teacher_course.Teacher_id=teacher.Teacher_id and course.Course_name='"+Ddl_course.SelectedItem.Text+"'";
			
				}
				else
				{
					strsql="select course.Course_name,course.Course_id,teacher.Teacher_name,course.Course_credit,course.Course_period from course,teacher,teacher_course where teacher_course.Course_year='"+Tbx_term.Text+"' and teacher_course.Course_id=course.Course_id and teacher_course.Teacher_id=teacher.Teacher_id and course.Course_name='"+Ddl_course.SelectedItem.Text+"' and teacher.Teacher_name='"+Tbx_teacher.Text+"'";
			
				}
			}
			SqlDataAdapter da=new SqlDataAdapter(strsql,cn);
			DataSet ds=new DataSet();
			da.Fill(ds);
			Dgd_sort.DataSource=ds;
			Dgd_sort.DataBind();
		}
		
	}
}