程序要和数据库交互要通过ADO.NET进行，通过AOD.NET就能在程序中执行SQL了





项目内嵌mdf文件形式的连接字符串  必须加

            string dataDir = AppDomain.CurrentDomain.BaseDirectory;

            if (dataDir.EndsWith(@"\bin\Debug\")

                || dataDir.EndsWith(@"\bin\Release\"))

            {

                dataDir = System.IO.Directory.GetParent(dataDir).Parent.Parent.FullName;

                AppDomain.CurrentDomain.SetData("DataDirectory", dataDir);

            }





ADO.NET经典案例

例1：插入数据：

using (SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=E:\C#程序\第二阶段\第二阶段\ADO.NET入门\AOD.net.mdf;Integrated Security=True"))

            {

                conn.Open();

                    using(SqlCommand cmd=conn.CreateCommand())

                    {

                        cmd.CommandText="insert into fuser(username,passwors)values('admin','888');";

                        cmd.ExecuteNonQuery();

                        Console.WriteLine("插入成功");

                    }



            }

            Console.WriteLine("测试正常");

            Console.ReadKey();





列2：登录验证：

Console.WriteLine("输入用户名");

            string username= Console.ReadLine();

            Console.WriteLine("输入密码");

            string password= Console.ReadLine();

            using (SqlConnection coon = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=E:\C#程序\第二阶段\第二阶段\ADO.NET入门\AOD.net.mdf;Integrated Security=True"))

            {

                coon.Open();

                using(SqlCommand cmd=coon.CreateCommand())//创建与数据库交谈的命令

                {

                    cmd.CommandText = "select *from fuser where username='"+username+"'";//先到表中查用户输入的用户名对应的信息

                    using( SqlDataReader reader=cmd.ExecuteReader())

                    {

                        if (reader.Read())

                        {

                            //用户名存在

                            string dbpass = reader.GetString(reader.GetOrdinal("passwors"));//比较数据库中记录的密码和用户输入的密码是否一致

                            if (password == dbpass)

                            {

                                Console.WriteLine("登录成功");

                            }