任课信息查询.aspx.cs

学生管理系统 功能不是很强大 但是很实用

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class 任课信息查询 : System.Web.UI.Page
{
    public SqlDataAdapter myadapter;
    SqlConnection mysqlconnection;
    DataSet myDataSet;
    SqlCommand mysqlcommand;
    protected void Page_Load(object sender, EventArgs e)
    {
        String sqlconn = "data source=.;database=学生成绩智能管理系统;user id=sa;password=sa;";
        mysqlconnection = new SqlConnection(sqlconn);
        mysqlcommand = mysqlconnection.CreateCommand();
        mysqlcommand.CommandText = "select distinct 成绩表.日期 from 成绩表,学生表,课程表,教师表 where 成绩表.课程号=课程表.课程号 and 成绩表.学号=学生表.学号 and 成绩表.任课教师编号=教师表.教师编号";
        mysqlconnection.Open();
        SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
        if (!IsPostBack)
        {
            while (myDataReader.Read())
            {
                this.DropDownList3.Items.Add(myDataReader.GetValue(0).ToString());
            }
        }
        myDataReader.Close();
        mysqlcommand = mysqlconnection.CreateCommand();
        mysqlcommand.CommandText = "select distinct 教师表.姓名 from 成绩表,学生表,课程表,教师表 where 成绩表.课程号=课程表.课程号 and 成绩表.学号=学生表.学号 and 成绩表.任课教师编号=教师表.教师编号";
        myDataReader = mysqlcommand.ExecuteReader();
        if (!IsPostBack)
        {
            DropDownList2.Items.Clear();
            while (myDataReader.Read())
            {
                this.DropDownList2.Items.Add(myDataReader.GetValue(0).ToString());
            }
        }
        myDataReader.Close();
        mysqlcommand.CommandText = "select distinct 教师表.教师编号,教师表.姓名,课程表.课程号,课程表.课程名,成绩表.日期 from 成绩表,学生表,课程表,教师表 where 成绩表.课程号=课程表.课程号 and 成绩表.学号=学生表.学号 and 成绩表.任课教师编号=教师表.教师编号";
        myDataSet = new DataSet();
        myadapter = new SqlDataAdapter();
        myadapter.SelectCommand = mysqlcommand;
        myadapter.Fill(myDataSet, "任课表");
        this.GridView1.DataSource = new DataView(myDataSet.Tables["任课表"]);
        this.GridView1.DataBind();
        mysqlconnection.Close();
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        mysqlcommand.CommandText = "select distinct " + DropDownList1.SelectedValue + " from 成绩表,学生表,课程表,教师表 where 成绩表.课程号=课程表.课程号 and 成绩表.学号=学生表.学号 and 成绩表.任课教师编号=教师表.教师编号";
        mysqlconnection.Open();
        SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
        DropDownList2.Items.Clear();
        while (myDataReader.Read())
        {
            this.DropDownList2.Items.Add(myDataReader.GetValue(0).ToString());
        }
        myDataReader.Close();
        mysqlconnection.Close();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        mysqlcommand.CommandText = "select distinct 教师表.教师编号,教师表.姓名,课程表.课程号,课程表.课程名,成绩表.日期 from 成绩表,学生表,课程表,教师表 where 成绩表.课程号=课程表.课程号 and 成绩表.学号=学生表.学号 and 成绩表.任课教师编号=教师表.教师编号 and " + DropDownList1.SelectedValue + "=" + "'" + DropDownList2.Text + "'";
        myDataSet = new DataSet();
        myadapter.SelectCommand = mysqlcommand;
        myDataSet.Clear();
        mysqlconnection.Open();
        myadapter.Fill(myDataSet, "任课表");
        this.GridView1.DataSource = new DataView(myDataSet.Tables["任课表"]);
        this.GridView1.DataBind();
        mysqlconnection.Close();
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        mysqlconnection.Open();
        mysqlcommand.CommandText = "select distinct 教师表.教师编号,教师表.姓名,课程表.课程号,课程表.课程名,成绩表.日期 from 成绩表,学生表,课程表,教师表 where 成绩表.课程号=课程表.课程号 and 成绩表.学号=学生表.学号 and 成绩表.任课教师编号=教师表.教师编号";
        myadapter.SelectCommand = mysqlcommand;
        myDataSet.Clear();
        myadapter.Fill(myDataSet, "任课表");
        this.GridView1.DataSource = new DataView(myDataSet.Tables["任课表"]);
        this.GridView1.DataBind();
        mysqlconnection.Close();
    }
}