VS2010連接配接SQL Server 2008并執行查詢操作

VS2010連接配接SQL Server 2008并執行查詢操作

先在SQL Server 2008中建一個Student資料庫，含有一個表student，4個字段，分别為姓名(varchar)學号(varchar)性别(varchar)年齡(int)，并指定一個使用者登入該資料庫，使用者名為cam，密碼為123456，注意要修改cam使用者的權限

建立控制台應用程式，連接配接資料庫，輸出student表中的所有字段，并執行插入删除操作

using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace 連接配接資料庫
{
    class Program
    {
        public static int Insert(string name, string pwd,string sex,int age)
        {
            SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog後面跟你資料庫的名字
            conn.Open();
            string sql = "insert into student(姓名,學号,性别,年齡) values(@name,@pwd,@sex,@age)";
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlParameter parn1 = new SqlParameter("@name", name);
            cmd.Parameters.Add(parn1);
            SqlParameter parn2 = new SqlParameter("@pwd", pwd);
            cmd.Parameters.Add(parn2);
            SqlParameter parn3 = new SqlParameter("@sex", sex);
            cmd.Parameters.Add(parn3);
            SqlParameter parn4 = new SqlParameter("@age", age);
            cmd.Parameters.Add(parn4);
            int result = cmd.ExecuteNonQuery();//result接收受影響行數，也就是說result大于0的話表示添加成功
            conn.Close();
            cmd.Dispose();
            return result;
        }
        public static int Update(string name)
        {
            SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog後面跟你資料庫的名字
            conn.Open();
            string sql = "delete from student where 姓名[email protected]";
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlParameter parn = new SqlParameter("@name",name);
            cmd.Parameters.Add(parn);
            int result = cmd.ExecuteNonQuery();//result接收受影響行數，也就是說result大于0的話表示删除成功
            conn.Close();
            cmd.Dispose();
            return result;
        }
        static void Main(string[] args)
        {
            //指定Sql Server提供者的連接配接字元串
            string connString = "server=CAMBRIDGE-PC;database =Student;uid=cam;pwd=123456";
            //建立連接配接對象
            SqlConnection Sqlconn = new SqlConnection(connString);
            //打開連接配接
            Sqlconn.Open();
            //為上面的連接配接指定Command對象
            SqlCommand thiscommand = Sqlconn.CreateCommand();
            thiscommand.CommandText = "select 姓名,學号,性别,年齡 from student";
            //為指定的command對象執行DataReader
            SqlDataReader thisSqlDataReader = thiscommand.ExecuteReader();
            while (thisSqlDataReader.Read())
            {
                Console.WriteLine("{0} {1} {2} {3}", thisSqlDataReader["姓名"], thisSqlDataReader["學号"], thisSqlDataReader["性别"], thisSqlDataReader["年齡"]);
            }
            //關閉讀取
            thisSqlDataReader.Close();
            int result = Insert("關羽", "E01014307", "男", 25);
            Console.WriteLine("影響的行數為:{0}", result);
            result = Update("關羽");
            Console.WriteLine("影響的行數為:{0}", result);
            //關閉連接配接
            Sqlconn.Close();
            Console.ReadLine();
        }
    }
}
           

建Windows窗體應用程式也可以,在Form窗體中拖一個DataGridView控件，插入一個學生的資訊，在DataGridView控件中顯示所有學生的資訊

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace cam
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public static int Insert(string name, string pwd, string sex, int age)
        {
            SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog後面跟你資料庫的名字
            conn.Open();
            string sql = "insert into student(姓名,學号,性别,年齡) values(@name,@pwd,@sex,@age)";
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlParameter parn1 = new SqlParameter("@name", name);
            cmd.Parameters.Add(parn1);
            SqlParameter parn2 = new SqlParameter("@pwd", pwd);
            cmd.Parameters.Add(parn2);
            SqlParameter parn3 = new SqlParameter("@sex", sex);
            cmd.Parameters.Add(parn3);
            SqlParameter parn4 = new SqlParameter("@age", age);
            cmd.Parameters.Add(parn4);
            int result = cmd.ExecuteNonQuery();//result接收受影響行數，也就是說result大于0的話表示添加成功
            conn.Close();
            cmd.Dispose();
            return result;
        }
        public static int Update(string name)
        {
            SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog後面跟你資料庫的名字
            conn.Open();
            string sql = "delete from student where 姓名[email protected]";
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlParameter parn = new SqlParameter("@name", name);
            cmd.Parameters.Add(parn);
            int result = cmd.ExecuteNonQuery();//result接收受影響行數，也就是說result大于0的話表示删除成功
            conn.Close();
            cmd.Dispose();
            return result;
        }
        public DataTable sel()
        {
            SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog後面跟你資料庫的名字,如果你的SqlServer伺服器名稱後面不帶SQLEXPRESS，那麼Data Source=.
            conn.Open();
            string sql = "select * from student";
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            conn.Close();
            cmd.Dispose();
            return dt;
        } 
        private void Form1_Load(object sender, EventArgs e)
        {
            Insert("關羽", "E01014307", "男", 25);
            dataGridView1.DataSource = sel();
        }
    }
}