sortcourse.aspx.cs

C# SQL遍写的学生选课系统 给大家看看 有点多 有点复杂

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 partial class sortcourse : System.Web.UI.Page
	{
        private string strsql;
        private DataAccess DataAs;
		protected void Page_Load(object sender, System.EventArgs e)
		{		
			if(!IsPostBack)
			{
				//课程名称下拉列表框绑定
				string mysql1="select * from course where Course_kind='2'";
                DataAccess DataAs = new DataAccess();
                DataTable DT = DataAs.CreateDatatable(mysql1);
				Ddl_course.Items .Add (new ListItem("","") );
                for (int i = 0; i < DT.Rows.Count;i++ )
                {
                    Ddl_course.Items.Add(new ListItem(DT.Rows[i][1].ToString(), DT.Rows[i][0].ToString()));
                }
				
			}
		}

		#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.Cv_course.ServerValidate += new System.Web.UI.WebControls.ServerValidateEventHandler(this.Cv_course_ServerValidate);

		}
		#endregion

		protected void Btn_sort_Click(object sender, System.EventArgs e)
		{
			
			strsql="select COUNT(Student_id) from student_course where Course_id='"+Tbx_courseid.Text+"' and Course_year='"+Tbx_year.Text+"'";
            DataAs = new DataAccess();
            DataTable DT = DataAs.CreateDatatable(strsql);
			if((int)DT.Rows[0][0] != 0)
			{
				Lbl_all.Text="选此课总人数为："+DT.Rows[0][0].ToString();
            }
			else
			{
				Lbl_all.Text="无人选此课";
			}
			Pn_yes.Visible=true;
		
		}
	  
		protected void Btn_yes_Click(object sender, System.EventArgs e)
		{
            string id = Session["User_id"].ToString() + Tbx_courseid.Text;
            strsql = "insert into student_course(ID,Student_id,Course_id,Course_year) values('"+id+"','" + Session["User_id"].ToString() + "','" + Tbx_courseid.Text + "','" + Tbx_year.Text + "')";
			DataAs = new DataAccess();
            bool Result = DataAs.ExecSql(strsql);
			if (!Result)
            {
				Lbl_note.Text="添加失败!";
			}
		
		}

		protected 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)
		{			
			strsql="select * from course where Course_id='"+Tbx_courseid.Text+"'";
            DataAs = new DataAccess();
            DataTable DT = DataAs.CreateDatatable(strsql);
			if(DT.Rows.Count>0)
			{
				args.IsValid=true;
			}
			else
			{
				args.IsValid=false;
			}
		}

		protected 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+"'";
			
				}
			}
            DataAs = new DataAccess();
            DataTable DT = DataAs.CreateDatatable(strsql);
			GridView1.DataSource=DT;
            GridView1.DataBind();
		}

        protected void Tbx_courseid_TextChanged(object sender, EventArgs e)
        {

        }
        protected void Cv_course_ServerValidate1(object source, ServerValidateEventArgs args)
        {

        }
}
}