一、Sql Server 在Visual Studio的连接有两种方法:
(1)本地计算机连接;
- string s = "Data Source=计算机名称;initial Catalog=数据库名称;integrated Security=True";
(2)windows身份验证方式连接;
- string cc="Data Source = 计算机名称; Initial Catalog = 数据库名称; User ID = sa; Password = 你的密码";
二、在Visual Studio中使用:
例1:查询数据库中的数据并且显示出来
- string s = "Data Source=计算机名称;Initial Catalog=数据库名称;Integrated Security=True"; //此处使用本地计算机连接方式
- SqlConnection conn = new SqlConnection(s); //创建连接
- conn.Open(); //打开连接
- SqlCommand cmd = conn.CreateCommand();
- cmd.CommandText = "select * from T_User"; //使用命令
- SqlDataAdapter adapter=new SqlDataAdapter(cmd);
- DataTable dt=new DataTable();
- adapter.Fill(dt);
- conn.Dispose(); //释放所以资源
- cmd.Dispose();
- conn.Close(); //关闭连接
- string realname="";
- string username="";
- string mobile="";
- string address="";
- for (int i=0;i<dt.Rows.Count;i++)
- {
- realname=dt.Rows[i][3].ToString();
- username=dt.Rows[i][1].ToString();
- mobile=dt.Rows[i][4].ToString();
- address=dt.Rows[i][5].ToString();
- Console.WriteLine("姓名为{0},用户名为{1},手机为{2},地址为{3}", realname, username, mobile, address);
- }
- Console.ReadKey();
例2:删除表中数据
- string cc="Data Source = 计算机名称; Initial Catalog = 数据库名称; User ID = sa; Password = 你的密码"; //使用windows身份验证
- SqlConnection conn = new SqlConnection(s);
- conn.Open();
- SqlCommand cmd = conn.CreateCommand();
- cmd.CommandText = "delete from T_User where Id=5";
- cmd.ExecuteNonQuery();
- cmd.Dispose();
- conn.Close();
- Console.WriteLine("删除成功");
- Console.ReadKey();
例3:修改表中数据
- string s = "Data Source=计算机名称;initial Catalog=数据库名称;integrated Security=True";
- SqlConnection conn = new SqlConnection(s);
- conn.Open();
- SqlCommand cmd = conn.CreateCommand();
- cmd.CommandText = "update T_User set Card=@card where ID=3";
- cmd.Parameters.AddWithValue("@card", "13000000000000");
- cmd.ExecuteNonQuery();
- cmd.Dispose();
- conn.Close();
- conn.Dispose();
- Console.WriteLine("修改成功!");
- Console.ReadKey();
例4:向表中插入数据
- string s = "data source=计算机名称;initial catalog=数据库名称;integrated security=true";
- SqlConnection conn = new SqlConnection(s);
- conn.Open();
- SqlCommand cmd = conn.CreateCommand();
- cmd.CommandText = "insert into T_User(UserName,Password,RealName,Mobile,Address) values(@username,@password,@realname,@mobile,@address)";
- cmd.Parameters.AddWithValue("@username", "xingxing");
- cmd.Parameters.AddWithValue("@password", "77777");
- cmd.Parameters.AddWithValue("@realname", "星星");
- cmd.Parameters.AddWithValue("@mobile", 1300000000);
- cmd.Parameters.AddWithValue("@address", "河北省北京市");
- cmd.ExecuteNonQuery();
- cmd.Dispose();
- conn.Close();
- conn.Dispose();
- Console.WriteLine("成功插入一行");
- Console.ReadKey();