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  • C#窗口航空总结

    public string con = "Data Source=.;Initial Catalog=ticket;Integrated Security=True";//连接数据库语句
    private void Form1_Load(object sender, EventArgs e)
    {
    SqlConnection conn = new SqlConnection(con);//连接数据库

    string sql = "select * from CityInfo";//sql语句

    SqlCommand cmd = new SqlCommand(sql, conn);

    SqlDataAdapter da = new SqlDataAdapter();//卡车对象
    da.SelectCommand = cmd;
    DataSet ds = new DataSet();//建立两个临时数据表
    da.Fill(ds, "CityInfo");
    da.Fill(ds, "CityInfo2");


    //向数据集第一行添加数据"请选择"
    DataRow row = ds.Tables["CityInfo"].NewRow();
    row["Id"] = -1;
    row["CityName"] = "请选择";
    ds.Tables["CityInfo"].Rows.InsertAt(row, 0);

    DataRow row1 = ds.Tables["CityInfo2"].NewRow();
    row1["Id"] = -1;
    row1["CityName"] = "请选择";
    ds.Tables["CityInfo2"].Rows.InsertAt(row1, 0);

    //向下拉框填充数据
    this.comboBox1.DataSource = ds.Tables["CityInfo"];
    this.comboBox1.ValueMember = "Id";
    this.comboBox1.DisplayMember = "CityName";

    this.comboBox2.DataSource = ds.Tables["CityInfo2"];
    this.comboBox2.ValueMember = "Id";
    this.comboBox2.DisplayMember = "CityName";

    }

    private void but1_Click(object sender, EventArgs e)
    {

    int go = Convert.ToInt32(comboBox1.SelectedValue);//接受下拉框的值
    int qu = Convert.ToInt32(comboBox2.SelectedValue);
    string str = "Data Source=.;Initial Catalog=Ticket;Integrated Security=True";//连接数据库语句
    string sql = " select f.FlightNo,a.Airways ,f.LeaveTime,f.LandTime,f.Price from AirwaysInfo as a,FlightInfo as f where a.Id=f.AirwaysId and LeaveCity='" + go + "' and Destination='" + qu + "'";//连表查询语句
    SqlConnection conn = new SqlConnection(str);
    SqlDataAdapter da = new SqlDataAdapter(sql, conn);
    DataSet ds = new DataSet();
    da.Fill(ds, "aa");//保存在临时数据表
    dgv1.DataSource = ds.Tables["aa"];

    }

    private void dgv1_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
    {

    //获取数据库中的值,赋给变量
    string no = dgv1.SelectedRows[0].Cells[0].Value.ToString();
    string hangban = dgv1.SelectedRows[0].Cells[1].Value.ToString();
    string chu = Convert.ToString(dgv1.SelectedRows[0].Cells[2].Value);
    string mudidi = dgv1.SelectedRows[0].Cells[3].Value.ToString();
    int piaojia = Convert.ToInt32(dgv1.SelectedRows[0].Cells[4].Value);
    txt1.Text = no;//航班号
    txt5.Text = hangban;//航班公司
    txt2.Text = comboBox1.Text;//出发地
    txt6.Text = comboBox2.Text;//目的地
    txt3.Text = Convert.ToString(chu);//出发时间
    txt7.Text = mudidi;//到达时间
    txt4.Text = piaojia.ToString();//成人票价

    }

    private void but2_Click(object sender, EventArgs e)
    {
    SqlConnection conn = new SqlConnection(con);
    string date = dtp1.Value.ToString();//时间控件转字符串
    conn.Open();
    Random rd = new Random();
    int num1 = rd.Next(10000, 10000000);//随机数
    string sql =@"insert into OrderInfo ([OrderId],[FlightNo],
    [LeaveDate],[Number])values('" + num1 + "','" + txt1.Text + "','" + date + "','" + nup1.Text + "')";
    try
    {

    if (txt1.Text==string.Empty)//判断是否有航班
    {
    MessageBox.Show("请选择一个航班!");
    }
    else
    {

    if (DateTime.Now < dtp1.Value)//判断时间
    {
    SqlCommand cmd = new SqlCommand(sql, conn);
    int num = cmd.ExecuteNonQuery();
    if (num > 0)
    {
    MessageBox.Show("增加'" + nup1.Text + "'张成功!");
    }
    else
    {
    MessageBox.Show("增加失败!");
    }
    }
    else {
    MessageBox.Show("时间格式不对!");
    }

    }
    }
    catch (Exception ex)
    {

    MessageBox.Show("异常!"+ex, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
    finally
    {
    conn.Close();
    }


    }

    private void but3_Click(object sender, EventArgs e)
    {
    DialogResult result = MessageBox.Show("确定退出吗!!", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
    if (result == DialogResult.Yes)
    {
    this.Close();
    }
    }

    做项目啊,还是应该熟悉所有的知识!书到用时方恨少!

    好好学习,天天向上!

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  • 原文地址:https://www.cnblogs.com/www-zhazha-com/p/8523773.html
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