st_sortcourse.aspx.cs

本人上传的是学生管理系统,希望能给广大编程爱好都以帮助

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 STGROUP
{
	/// <summary>
	/// ST_sortcourse 的摘要说明。
	/// </summary>
	public class ST_sortcourse : System.Web.UI.Page
	{
		SqlConnection st_conn1;
		protected System.Web.UI.WebControls.DropDownList st_ddl_course;
		protected System.Web.UI.WebControls.TextBox st_tbx_teacher;
		protected System.Web.UI.WebControls.TextBox st_tbx_term;
		protected System.Web.UI.WebControls.RequiredFieldValidator st_rfv_year;
		protected System.Web.UI.WebControls.Button st_btn_look;
		protected System.Web.UI.WebControls.DataGrid st_dtg_sort;
		protected System.Web.UI.WebControls.TextBox st_tbx_courseid;
		protected System.Web.UI.WebControls.TextBox st_tbx_year;
		protected System.Web.UI.WebControls.Button st_btn_sort;
		protected System.Web.UI.WebControls.CustomValidator st_cv_course;
		protected System.Web.UI.WebControls.Label st_lbl_note;
		protected System.Web.UI.WebControls.Label st_lbl_all;
		protected System.Web.UI.WebControls.Button st_btn_yes;
		protected System.Web.UI.WebControls.Button st_btn_no;
		protected System.Web.UI.WebControls.Panel st_pn_yes;string st_sqlstr;
		private void Page_Load(object sender, System.EventArgs e)
		{	string st_connstr= ConfigurationSettings.AppSettings["st_dbconn"];
			st_conn1=new SqlConnection(st_connstr);	
			if(!IsPostBack)
			{
				//课程名称下拉列表框绑定
				
				SqlConnection st_conn2=new SqlConnection(st_connstr);	
				st_conn2.Open ();
				string st_sql1="select * from ST_course where ST_Course_kind='2'";
				SqlCommand st_comm1=new SqlCommand (st_sql1,st_conn2);
				SqlDataReader st_dr=st_comm1.ExecuteReader ();
				st_ddl_course.Items .Add (new ListItem("","") );
				while(st_dr.Read ())
				{
					st_ddl_course.Items .Add (new ListItem(st_dr["ST_Course_name"].ToString() ,st_dr["ST_Course_id"].ToString()) );
				}
				st_conn2.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.st_btn_look.Click += new System.EventHandler(this.st_btn_look_Click);
			this.st_btn_sort.Click += new System.EventHandler(this.st_btn_sort_Click);
			this.st_btn_yes.Click += new System.EventHandler(this.st_btn_yes_Click);
			this.st_btn_no.Click += new System.EventHandler(this.st_btn_no_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void st_btn_sort_Click(object sender, System.EventArgs e)
		{
			//在数据库中找出选此课的总人数
			string st_sqlstr="select COUNT(ST_Student_id) from ST_student_course where ST_Course_id='"+st_tbx_courseid.Text+"' and ST_Course_year='"+st_tbx_year.Text+"'";
			SqlCommand st_comm1=new SqlCommand(st_sqlstr,st_conn1);		
			st_conn1.Open();
			SqlDataReader st_dr1=st_comm1.ExecuteReader();
			if(st_dr1.Read())
			{
				st_lbl_all.Text="选此课总人数为："+st_dr1[0].ToString();
            		}
			else
			{
				st_lbl_all.Text="无人选此课";
			}
			st_pn_yes.Visible=true;
			st_conn1.Close();
		
		}
	  
		private void st_btn_yes_Click(object sender, System.EventArgs e)
		{
		    st_sqlstr="insert into ST_student_course(ST_Student_id,ST_Course_id,ST_Course_year) values(@Student_id,@Course_id,@Course_year)";
			SqlCommand st_comm=new SqlCommand(st_sqlstr,st_conn1);
			st_comm.Parameters.Add(new SqlParameter("@Student_id",SqlDbType.VarChar,50));
			st_comm.Parameters.Add(new SqlParameter("@Course_id",SqlDbType.VarChar,50));
			st_comm.Parameters.Add(new SqlParameter("@Course_year",SqlDbType.VarChar,50));
			st_comm.Parameters["@Student_id"].Value=Session["User_id"].ToString();
			st_comm.Parameters["@Course_id"].Value=st_tbx_courseid.Text;
			st_comm.Parameters["@Course_year"].Value=st_tbx_year.Text;
			st_conn1.Open();
			try
			{
				st_comm.ExecuteNonQuery();
			}
			catch(SqlException)
			{
				st_lbl_note.Text="添加失败!";
			}
            
			st_conn1.Close();
		
		}

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

		private void st_cv_course_ServerValidate(object source, System.Web.UI.WebControls.ServerValidateEventArgs args)
		{			
			st_conn1.Open();
			st_sqlstr="select * from ST_course where ST_Course_id='"+st_tbx_courseid.Text+"'";
			SqlCommand st_comm=new SqlCommand(st_sqlstr,st_conn1);
			SqlDataReader st_dr1=st_comm.ExecuteReader();
			if(st_dr1.Read())
			{
				args.IsValid=true;
			}
			else
			{
				args.IsValid=false;
			}
			st_conn1.Close();
		}

		private void st_btn_look_Click(object sender, System.EventArgs e)
		{
			if(st_ddl_course.SelectedItem.Text=="")
			{
				if(st_tbx_teacher.Text=="")
				{st_sqlstr="select ST_course.ST_Course_name,ST_course.ST_Course_id,ST_teacher.ST_Teacher_name,ST_course.ST_Course_credit,ST_course.ST_Course_period from ST_course,ST_teacher,ST_teacher_course where ST_teacher_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_teacher_course.ST_Course_id=ST_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id";
				}
				else
				{
				st_sqlstr="select ST_course.ST_Course_name,ST_course.ST_Course_id,ST_teacher.ST_Teacher_name,ST_course.ST_Course_credit,ST_course.ST_Course_period from ST_course,ST_teacher,ST_teacher_course where ST_teacher_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_teacher_course.ST_Course_id=ST_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher.ST_Teacher_name='"+st_tbx_teacher.Text+"'";
			
				}
			}
			else
			{
				if(st_tbx_teacher.Text=="")
				{
				st_sqlstr="select ST_course.ST_Course_name,ST_course.ST_Course_id,ST_teacher.ST_Teacher_name,ST_course.ST_Course_credit,ST_course.ST_Course_period from ST_course,ST_teacher,ST_teacher_course where ST_teacher_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_teacher_course.ST_Course_id=ST_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_course.ST_Course_name='"+st_ddl_course.SelectedItem.Text+"'";
			
				}
				else
				{
					st_sqlstr="select ST_course.ST_Course_name,ST_course.ST_Course_id,ST_teacher.ST_Teacher_name,ST_course.ST_Course_credit,ST_course.ST_Course_period from ST_course,ST_teacher,ST_teacher_course where ST_teacher_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_teacher_course.ST_Course_id=ST_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_course.ST_Course_name='"+st_ddl_course.SelectedItem.Text+"' and ST_teacher.ST_Teacher_name='"+st_tbx_teacher.Text+"'";
			
				}
			}
			SqlDataAdapter st_da=new SqlDataAdapter(st_sqlstr,st_conn1);
			DataSet st_ds=new DataSet();
			st_da.Fill(st_ds);
			st_dtg_sort.DataSource=st_ds;
			st_dtg_sort.DataBind();
		}
		
	}
}