读取SQL server数据通过控件teechart显示曲线

最新推荐文章于 2024-03-09 11:38:13 发布

原创最新推荐文章于 2024-03-09 11:38:13 发布 · 4.1k 阅读

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#sql server #string #security #database #cmd #object

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using System;
using System.Drawing;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Diagnostics;

namespace tchart_SQL
{
    public partial class Form1 : Form
    {
        private string connString = @"server = localhost;integrated security = true; database = student";
        string s = "select studentID,[英语],[数学],[语文],[总分] from score order by studentID Desc";//[英语],[数学],[语文],[总分]
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Stopwatch sw = new Stopwatch();//测试性能
            sw.Start();
            tChart1.Aspect.View3D = false;
            SqlConnection conn = new SqlConnection(connString);
            conn.Open();
            SqlCommand cmd2 = new SqlCommand(s, conn);
            SqlDataReader aReader = cmd2.ExecuteReader();
            line1.Title = "英语";
            line2.Title = "数学";
            line3.Title = "语文";
            line4.Title = "总分";

            while (aReader.Read())
            {
                line1.Add(Convert.ToInt32(aReader[1]),aReader[0].ToString(),Color.Red);
                line2.Add(Convert.ToInt32(aReader[2]),aReader[0].ToString(),Color.Black);
                line3.Add(Convert.ToInt32(aReader[3]),aReader[0].ToString(),Color.Blue);
                line4.Add(Convert.ToInt32(aReader[4]),aReader[0].ToString(),Color.DarkRed);
            }
            aReader.Close();
            conn.Close();
            sw.Stop();
            MessageBox.Show(sw.ElapsedMilliseconds.ToString());
        }
    }
}