添加科目.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 添加科目 : System.Web.UI.Page
{
  
    public string sqlconn;
    DataRow dtr;
    SqlDataAdapter myadapter;
    SqlCommandBuilder scb;
    DataSet myDataSet;
    SqlConnection mysqlconnection;
    int returnValue;
    DataTable tb;
    int numberOfRow;
    int i;
    protected void Page_Load(object sender, EventArgs e)
    {
        sqlconn = "data source=.;database=学生成绩智能管理系统;user id=sa;password=sa;";
        mysqlconnection = new SqlConnection(sqlconn);
        SqlCommand mysqlcommand = mysqlconnection.CreateCommand();
        mysqlcommand.CommandText = "select max(课程号) as 最大编号 from 课程表";
        myadapter = new SqlDataAdapter();
        myadapter.SelectCommand = mysqlcommand;
        myDataSet = new DataSet();
        mysqlconnection.Open();
        numberOfRow = myadapter.Fill(myDataSet, "课程表");
        mysqlconnection.Close();
        tb = myDataSet.Tables["课程表"];
        TextBox1.Text = Convert.ToString(myDataSet.Tables["课程表"].Rows[0]["最大编号"]);
        Button2.Enabled = false;
        Button3.Enabled = false;
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        if (TextBox2.Text == "" || TextBox3.Text == "" || TextBox5.Text == "" )
        {
            Response.Write("<script>alert('请完善信息!');</script>");
            Button3.Enabled = false;
        }
        else
        {
            Button2.Enabled = false;
            Button3.Enabled = true;
        }
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        myDataSet.Clear();
        SqlCommand mysqlcommand = mysqlconnection.CreateCommand();
        myadapter.SelectCommand = mysqlcommand;
        mysqlcommand.CommandText = "select * from 课程表";
        mysqlconnection.Open();
        numberOfRow = myadapter.Fill(myDataSet, "课程表");
        tb = myDataSet.Tables["课程表"];
        dtr = tb.NewRow();
        dtr["课程号"] = TextBox2.Text;
        dtr["课程名"] = TextBox3.Text;
        dtr["学分"] = TextBox5.Text;
        dtr["备注"] = TextBox7.Text;
        tb.Rows.Add(dtr);
        SqlCommandBuilder scb = new SqlCommandBuilder(myadapter);
        myadapter.Update(myDataSet.Tables["课程表"]);
        Response.Write("<script>alert('课程添加成功！');</script>");
        mysqlconnection.Close();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        mysqlconnection.Open();
        SqlCommand coutsqlcommand = mysqlconnection.CreateCommand();
        coutsqlcommand.CommandText = "select count(*) as 数目 from 课程表 where 课程号=" + "'" + Convert.ToString(TextBox2.Text) + "'";
        if (TextBox2.Text != "")
        {
            returnValue = (int)coutsqlcommand.ExecuteScalar();
            mysqlconnection.Close();
            if (returnValue == 1)
            {
                Response.Write("<script>alert('课程号已存在!');</script>");
                Button3.Enabled = false;
                Button2.Enabled = false;
            }
            else
            {
                Response.Write("<script>alert('课程号可以用!');</script>");
                Button3.Enabled = false;
                Button2.Enabled = true;
            }
        }
    }
}