st_grade_query.aspx.cs

学生管理系统（asp.net+sql server）

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_grade_query 的摘要说明。
	/// </summary>
	public class ST_grade_query : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button st_btn_ok;
		protected System.Web.UI.WebControls.DataGrid st_dtg_grade;
		protected System.Web.UI.WebControls.TextBox st_tbx_course;
		protected System.Web.UI.WebControls.Label st_lbl_must;
		protected System.Web.UI.WebControls.Label st_lbl_sort;
	    string st_sqlstr;
		protected System.Web.UI.WebControls.TextBox st_tbx_term;
		protected System.Web.UI.WebControls.Button st_btn_look;SqlConnection st_conn;
		private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
		string st_connstr= ConfigurationSettings.AppSettings["st_dbconn"];
			st_conn=new SqlConnection(st_connstr);	
		}

		#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_ok.Click += new System.EventHandler(this.st_btn_ok_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		

		private void st_btn_ok_Click(object sender, System.EventArgs e)
		{
			
			//当课程名称为空时，执行下面代码
			if(st_tbx_course.Text=="")
			{
				st_sqlstr="select ST_course.ST_Course_name,ST_student_course.ST_Course_id,ST_Course_year,ST_Student_grade,ST_Course_credit,ST_Course_kind from ST_student_course,ST_course where ST_Course_year='"+st_tbx_term.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_Student_id='"+Session["User_id"].ToString()+"'";
				
			}
			 //当课程名称非空时，执行下面代码
			else
			{
				st_sqlstr="select ST_course.ST_Course_name,ST_student_course.ST_Course_id,ST_Course_year,ST_Student_grade,ST_Course_credit,ST_Course_kind from ST_student_course,ST_course where ST_Course_year='"+st_tbx_term.Text+"'and ST_course.ST_Course_id=ST_student_course.ST_Course_id and ST_course.ST_Course_name='"+st_tbx_course.Text+"'and ST_Student_id='"+Session["User_id"].ToString()+"'";
			}
			st_conn.Open();
			SqlDataAdapter st_da=new SqlDataAdapter(st_sqlstr,st_conn);
			DataSet st_ds=new DataSet();
			st_da.Fill(st_ds);
			st_dtg_grade.DataSource=st_ds;
			st_dtg_grade.DataBind();
			st_conn.Close();
			 //在Label中显示信息
			display();
		}
		//选出必修课总学分和选修课总学分显示在Label中
		public void display()
		{
			//选出非选修课总学分，条件是必须及格
			st_sqlstr="select SUM(ST_Course_credit) from ST_course,ST_student_course where ST_Course_year='"+st_tbx_term.Text+"' and ST_Student_id=@Student_id and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_Course_kind=2 and ST_Student_grade>=60";
			SqlCommand st_comm=new SqlCommand(st_sqlstr,st_conn);
			st_comm.Parameters.Add(new SqlParameter("@Student_id",SqlDbType.VarChar,50));
			st_comm.Parameters["@Student_id"].Value=Session["User_id"].ToString();
			st_conn.Open();
			SqlDataReader dr=st_comm.ExecuteReader();
			if(dr.Read())
			{
				st_lbl_sort.Text="本学期选修课的总学分为："+dr[0].ToString();
			}
			else
			{
				st_lbl_sort.Text="本学期选修课的总学分为：0";
			}
			st_conn.Close();
			//选出选修课总学分，条件是必须及格
			st_sqlstr="select SUM(ST_Course_credit) from ST_course,ST_student_course where ST_Course_year='"+st_tbx_term.Text+"' and ST_Student_id=@Student_id and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_Course_kind<2 and ST_Student_grade>=60";
			st_comm=new SqlCommand(st_sqlstr,st_conn);
			st_comm.Parameters.Add(new SqlParameter("@Student_id",SqlDbType.VarChar,50));
			st_comm.Parameters["@Student_id"].Value=Session["User_id"].ToString();
			st_conn.Open();
			dr=st_comm.ExecuteReader();
			if(dr.Read())
			{
				st_lbl_must.Text="本学期必修课的总学分为："+dr[0].ToString();
			}
			else
			{
				st_lbl_must.Text="本学期必修课的总学分为：0";
			}
			st_conn.Close();		
		}

	}
}