st_grade_manage.aspx.cs

This I develops based on the B/S structure student managementsystem management system, hoped brings

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>
	/// grade_manage 的摘要说明。
	/// </summary>
	public partial class ST_grade_manage : System.Web.UI.Page
	{
		SqlConnection st_conn;
		string st_sqlstr;
		protected 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()
		{    

		}
		#endregion


		protected void st_btn_search_Click(object sender, System.EventArgs e)
		{
			ST_BindGrid();

		}
		public void DataGrid_Page(object sender,DataGridPageChangedEventArgs e)
		{
			st_dtg_grade.CurrentPageIndex=e.NewPageIndex;
			ST_BindGrid();
		}
		public void ST_BindGrid()
		{
			if(st_ddl_way.SelectedItem.Text=="按学号")
			{
				if(st_tbx_term.Text=="所有")
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_student_course.ST_Student_id='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
				}
				else
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_student_course.ST_Student_id='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
				}
			}
			else if(st_ddl_way.SelectedItem.Text=="按课号")
			{
				if(st_tbx_term.Text=="所有")
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_student_course.ST_Course_id='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
				}
				else
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_student_course.ST_Course_id='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
				}
			}
			else if(st_ddl_way.SelectedItem.Text=="按课程名")
			{
				if(st_tbx_term.Text=="所有")
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_course.ST_Course_name='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
			
				}
				else
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_course.ST_Course_name='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
				}
			}
			else if(st_ddl_way.SelectedItem.Text=="按班级")
			{
				if(st_tbx_term.Text=="所有")
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_student.ST_Student_classid='"+st_tbx_name.Text+"'and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
			
				}
				else
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_student.ST_Student_classid='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
				}
			}
			else if(st_ddl_way.SelectedItem.Text=="按教师号")
			{
				if(st_tbx_term.Text=="所有")
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_teacher.ST_Teacher_id='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
			
				}
				else
				{
					st_sqlstr="select ST_student_course.ST_ID,ST_student_course.ST_Student_id,ST_student.ST_Student_name,ST_student.ST_Student_classid,ST_student_course.ST_Course_id,ST_course.ST_Course_name,ST_teacher.ST_Teacher_name,ST_student_course.ST_Student_grade from ST_course,ST_student,ST_teacher,ST_student_course,ST_teacher_course where ST_teacher.ST_Teacher_id='"+st_tbx_name.Text+"' and ST_student_course.ST_Course_year='"+st_tbx_term.Text+"' and ST_student_course.ST_Course_id=ST_course.ST_Course_id and ST_student_course.ST_Student_id=ST_student.ST_Student_id and ST_student_course.ST_Course_id=ST_teacher_course.ST_Course_id and ST_teacher_course.ST_Teacher_id=ST_teacher.ST_Teacher_id and ST_teacher_course.ST_Class_id=ST_student.ST_Student_classid"; 
				}
			}
			
			SqlCommand st_comm=new SqlCommand(st_sqlstr,st_conn);
			st_conn.Open();
			SqlDataReader dr=st_comm.ExecuteReader();
			if(dr.Read())
			{
				st_dtg_grade.Visible=true;
				st_conn.Close();
				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();
			}
			else
			{
				st_dtg_grade.Visible=false;
				st_lbl_note.Text="无纪录！";
			}
			st_conn.Close();
		}
		public void DataGrid_cancel(object sender,DataGridCommandEventArgs e)
		{
			
			st_dtg_grade.EditItemIndex=-1;
			ST_BindGrid();
			
		}
		public void DataGrid_edit(object sender,DataGridCommandEventArgs e)
		{
			
			st_dtg_grade.EditItemIndex=(int)e.Item.ItemIndex;
			ST_BindGrid();
			
		}
		public void DataGrid_update(object sender,DataGridCommandEventArgs e)
		{
			string st_sqlstr="update ST_student_course set ST_Student_grade=@Student_grade where ST_Student_id=@Student_id and ST_Course_id=@Course_id and ST_ID=@id";
			SqlCommand st_comm=new SqlCommand(st_sqlstr,st_conn);
			st_comm.Parameters.Add(new SqlParameter("@Student_grade",SqlDbType.Int,4));
			st_comm.Parameters.Add(new SqlParameter("@Course_id",SqlDbType.VarChar,50));
			st_comm.Parameters.Add(new SqlParameter("@Student_id",SqlDbType.VarChar,50));