.net MVC 连接数据本地数据库三种方法

 1   <appSettings>
 2     <add key="webpages:Version" value="2.0.0.0" />
 3     <add key="webpages:Enabled" value="false" />
 4     <add key="PreserveLoginUrl" value="true" />
 5     <add key="ClientValidationEnabled" value="true" />
 6     <add key="UnobtrusiveJavaScriptEnabled" value="true" />
 7     <add key="con" value="server=.sqlexpress; user id = sa;password = a123456;database = xsgl1;max pool size=512;"/>
 8   </appSettings>
 9   <connectionStrings>
10     <add name="conSql" connectionString="server=(local)sqlexpress; User Id = sa;password = a123456;database = xsgl1;max pool size=512;"/>
11   </connectionStrings> 

1     public class HomeController : Controller
 2     {
 3         //
 4         // GET: /Home/
 5 
 6         public ActionResult Index()
 7         {
 8             #region connect sql function one
 9             SqlConnectionStringBuilder one = new SqlConnectionStringBuilder();
10             one.DataSource = "(local)\sqlexpress";
11             one.InitialCatalog = "xsgl1";
12             one.UserID = "sa";
13             one.Password = "a123456";
14             one.MaxPoolSize = 512;
15             SqlConnection sct = new SqlConnection(one.ConnectionString);
16             #endregion
17             #region connect sql function two
18             //string conn = ConfigurationManager.AppSettings["con"].ToString();
19             //SqlConnection sct = new SqlConnection(conn);
20             #endregion
21             #region connect sql function three
22             //string conn = ConfigurationManager.ConnectionStrings["conSql"].ConnectionString;
23             //SqlConnection sct = new SqlConnection(conn);
24             #endregion
25             SqlCommand scm = new SqlCommand();
26             scm.Connection = sct;
27             scm.CommandType = CommandType.Text;
28             scm.CommandText = "select 课程名 from kc where 课程号='A001'";
29             sct.Open();
30             SqlDataReader sdr = scm.ExecuteReader();
31             if (sdr.Read())
32             {
33                 ViewBag.hao = sdr["课程名"];
34             }
35             sdr.Close();
36             return View();
37         }
38         public ActionResult About()
39         {
40             return View();
41         }
42     }

1 @{
2     ViewBag.Title = "Index";
3 }
4 @ViewBag.hao
5 <h2>Index</h2>