grade_query.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>
	/// grade_query 的摘要说明。
	/// </summary>
	public partial class grade_query : System.Web.UI.Page
	{
	    string strsql;
		protected System.Web.UI.WebControls.Button Btn_look;
		protected void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
	
		}

		#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()
		{    

		}
		#endregion

		protected void Btn_information_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("query.aspx");
		}

		protected void Btn_ok_Click(object sender, System.EventArgs e)
		{
			
			if(Tbx_course.Text=="")
			{
				strsql="select course.Course_name,student_course.Course_id,Course_year,Student_grade,Course_credit,Course_kind from student_course,course where Course_year='"+Tbx_term.Text+"' and student_course.Course_id=course.Course_id and Student_id='"+Session["User_id"].ToString()+"'";
				
			}
			else
			{
				strsql="select course.Course_name,student_course.Course_id,Course_year,Student_grade,Course_credit,Course_kind from student_course,course where Course_year='"+Tbx_term.Text+"'and course.Course_id=student_course.Course_id and course.Course_name='"+Tbx_course.Text+"'and Student_id='"+Session["User_id"].ToString()+"'";
			}
            DataAccess DataAs = new DataAccess();
            DataTable DT = DataAs.CreateDatatable(strsql);
			GridView1.DataSource=DT;
            GridView1.DataBind();
			Lbl_note.Visible=true;
			display();
		}
		public void display()
		{
            strsql = "select COALESCE(SUM(Course_credit),0) from course,student_course where Course_year='" + Tbx_term.Text + "' and student_course.Course_id=course.Course_id and Course_kind=2 and Student_grade>=60";
            DataAccess DataAs = new DataAccess();
            DataTable DT = DataAs.CreateDatatable(strsql);
            if ((int)DT.Rows[0][0] != 0)
            {
                Lbl_sort.Text = "本学期选修课的总学分为：" + DT.Rows[0][0].ToString();
            }
            else
            {
                Lbl_sort.Text = "本学期选修课的总学分为：0";
            }
			strsql="select SUM(Course_credit) from course,student_course where Course_year='"+Tbx_term.Text+"' and student_course.Course_id=course.Course_id and Course_kind<2 and Student_grade>=60";
            DT = DataAs.CreateDatatable(strsql);
            if ((int)DT.Rows[0][0] != 0)
            {
                Lbl_must.Text = "本学期必修课的总学分为：" + DT.Rows[0][0].ToString();
            }
            else
            {
                Lbl_must.Text = "本学期选修课的总学分为：0";
            }
		}

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

		
		protected void Btn_see_Click(object sender, System.EventArgs e)
		{
		  Response.Redirect("sortcourse.aspx");
		}

		protected void Btn_personnel_Click(object sender, System.EventArgs e)
		{
		Response.Redirect("updatepwd.aspx");
		}

		protected void Btn_course_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("course_student.aspx");
		}

		protected void Btn_grade_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("grade_query.aspx");
		}
        protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            GridView1.PageIndex = e.NewPageIndex;
           
        }
}
}