修改删除科目.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 修改删除科目 : 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 课程号 from 课程表";
        mysqlconnection.Open();
        SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
        if (!IsPostBack)
        {
            while (myDataReader.Read())
            {
                this.DropDownList1.Items.Add(myDataReader.GetValue(0).ToString());
            }

            myDataReader.Close();
        }
        mysqlconnection.Close();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        mysqlcommand = mysqlconnection.CreateCommand();
        mysqlcommand.CommandText = "select 课程号,课程名,学分,备注 from 课程表 where 课程号= '" + DropDownList1.Text + "'";
        mysqlconnection.Open();
        SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
        if(myDataReader.Read())
        {
            TextBox1.Text = myDataReader.GetValue(0).ToString();
            TextBox2.Text = myDataReader.GetValue(1).ToString();
            TextBox3.Text = myDataReader.GetValue(2).ToString();
            TextBox4.Text = myDataReader.GetValue(3).ToString();
        }
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        mysqlcommand = mysqlconnection.CreateCommand();
        mysqlconnection.Open();
        mysqlcommand.CommandText = "update 课程表 set 课程号=" + "'" + TextBox1.Text + "'" + ",课程名='" + TextBox2.Text + "',学分='"+  Convert.ToInt32(TextBox3.Text)+"',备注='"+TextBox4.Text +"'where 课程号='" + TextBox1.Text + "'";
        int returnValue = (int)mysqlcommand.ExecuteNonQuery();
        if (returnValue != 0)
        {
            Response.Write("<script>alert('修改成功!');</script>");
        }
           
        else
            Response.Write("<script>alert('未知错误!');</script>");
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        mysqlcommand = mysqlconnection.CreateCommand();
        mysqlconnection.Open();
        mysqlcommand.CommandText = "delete 课程表 where 课程号='" + TextBox1.Text + "'";
        int returnValue = (int)mysqlcommand.ExecuteNonQuery();
        if (returnValue != 0)
        {
            Response.Write("<script>alert('删除成功!');</script>");
        }
        else
            Response.Write("<script>alert('未知错误!');</script>");
    }
}